diff --git a/changelog.md b/changelog.md
index bbd3e637..73e35d56 100644
--- a/changelog.md
+++ b/changelog.md
@@ -25,8 +25,10 @@
 * add `.era()` get/set method
 * found 6 or 7 wrong offsets
 
-## v3.0.0
+## v3.0.1
 * fallback to UTC, instead of PST if no `Intl` is present
 * support passing-in offsets as ISO_8601 date-strings
 * add epoch-seconds warning msg
 * allow getting/setting new timezones
+### v3.1.0
+* dramatic speedup by optimizing walkTo method
diff --git a/immutable.js b/immutable.js
index 41c89b52..7399234f 100644
--- a/immutable.js
+++ b/immutable.js
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+a("L","M",4),a("Y","y",4),a("c","e",4),a("k","H",2),a("K","h",2),a("S","s",2),a("v","z",4),a("V","Z",4);var i=function(n,t){for(var e=n.split(""),r=[e[0]],a=!1,i=1;i<e.length;i+=1){if("'"===e[i]){if(a=!a,a!==!0||!e[i+1]||"'"!==e[i+1])continue;a=!0}a===!0||e[i]===r[r.length-1][0]?r[r.length-1]+=e[i]:r.push(e[i])}return r.reduce(function(n,e){return n+=void 0!==o[e]?o[e](t)||"":e},"")};t.exports=i},{"../../fns":12}],22:[function(n,t,e){"use strict";var r=n("../fns"),o=n("../data/days"),a=n("../data/months"),i=function(n){var t={i18n:function(n){if(!(r.isObject(n)&&r.isObject(n.days)&&r.isObject(n.months)&&r.isArray(n.days.short)&&r.isArray(n.days.long)&&r.isArray(n.months.short)&&r.isArray(n.months.long)))throw new Error("Invalid i18n payload passed.");o.set(n.days),a.set(n.months)}};Object.keys(t).forEach(function(e){n.prototype[e]=t[e]})};t.exports=i},{"../data/days":5,"../data/months":8,"../fns":12}],23:[function(n,t,e){"use strict";var r=function(n,t){t=t.toLowerCase(),t=t.replace(/s$/,"");var e=n.progress();return void 0!==e[t]?(e[t]>.5&&n.add(1,t),n.startOf(t)):console.warn("no known unit '"+t+"'"),n};t.exports=r},{}],24:[function(n,t,e){"use strict";var r=function(n){var t=["year","season","quarter","month","week","day","quarterHour","hour","minute"],e={};return t.forEach(function(t){var r=n.clone().startOf(t),o=n.clone().endOf(t),a=o.epoch-r.epoch,i=(n.epoch-r.epoch)/a;e[t]=parseFloat(i.toFixed(2))}),e};t.exports=r},{}],25:[function(n,t,e){"use strict";var r=n("../../data/quarters"),o=n("../../data/seasons"),a=n("../set/set"),i=function(n){n.minute(0),n.second(0),n.millisecond(1)};t.exports={time:function(n){return void 0!==n?(this.epoch=a.time(this,n),this):this.format("time-h12")},week:function(n){if(void 0!==n)return this.month(0),this.date(1),this.day("monday"),i(this),"december"===this.monthName()&&this.add(1,"week"),n-=1,this.add(n,"weeks"),this;var t=this.clone();t.month(0),t.date(1),i(t),t.day("monday"),"december"===t.monthName()&&t.add(1,"week");var e=this.epoch;if(t.epoch>e)return 1;for(var r=0;r<52;r++){if(t.epoch>e)return r;t.add(1,"week")}return 52},quarter:function(n){if(void 0!==n&&("string"==typeof n&&(n=n.replace(/^q/i,""),n=parseInt(n,10)),r[n])){var t=r[n][0];return this.month(t),this.date(1),this.hour(0),i(this),this}for(var e=this.d.getMonth(),o=1;o<r.length;o++)if(e<r[o][0])return o-1;return 4},hourFloat:function(n){if(void 0!==n){var t=n%1;t=60*t;var e=parseInt(n,10);return this.epoch=a.hours(this,e),this.epoch=a.minutes(this,t),this}var r=this.d,o=r.getHours(),i=r.getMinutes();return i/=60,o+i},season:function(n){var t="north";if("South"===this.timezone().hemisphere&&(t="south"),void 0!==n){for(var e=0;e<o[t].length;e++)n===o[t][e][0]&&(this.month(o[t][e][1]),this.date(1),this.hour(0),i(this));return this}for(var r=this.d.getMonth(),a=0;a<o[t].length-1;a++)if(r>=o[t][a][1]&&r<o[t][a+1][1])return o[t][a][0];return"winter"}}},{"../../data/quarters":9,"../../data/seasons":10,"../set/set":30}],26:[function(n,t,e){"use strict";var r=n("./normal"),o=n("./destructive"),a=n("./tricky"),i=function(n){Object.keys(r).forEach(function(t){n.prototype[t]=r[t]}),Object.keys(o).forEach(function(t){n.prototype[t]=o[t]}),Object.keys(a).forEach(function(t){n.prototype[t]=a[t]})};t.exports=i},{"./destructive":25,"./normal":27,"./tricky":28}],27:[function(n,t,e){"use strict";var r=n("../set/set"),o={millisecond:function(n){return void 0!==n?(this.epoch=r.milliseconds(this,n),this):this.d.getMilliseconds()},second:function(n){return void 0!==n?(this.epoch=r.seconds(this,n),this):this.d.getSeconds()},minute:function(n){return void 0!==n?(this.epoch=r.minutes(this,n),this):this.d.getMinutes()},hour:function(n){var t=this.d;return void 0!==n?(this.epoch=r.hours(this,n),this):t.getHours()},hour12:function n(t){var e=this.d;if(void 0!==t){t=""+t;var o=t.match(/^([0-9]+)(am|pm)$/);if(o){var a=parseInt(o[1],10);"pm"===o[2]&&(a+=12),this.epoch=r.hours(this,a)}return this}var n=e.getHours();return n>12&&(n-=12),0===n&&(n=12),n},date:function(n){return void 0!==n?(this.epoch=r.date(this,n),this):this.d.getDate()},month:function(n){return void 0!==n?(this.epoch=r.month(this,n),this):this.d.getMonth()},year:function(n){return void 0!==n?(this.epoch=r.year(this,n),this):this.d.getFullYear()},dayTime:function(n){if(void 0!==n){var t={morning:"7:00am",breakfast:"7:00am",noon:"12:00am",lunch:"12:00pm",afternoon:"2:00pm",evening:"6:00pm",dinner:"6:00pm",night:"11:00pm",midnight:"23:59pm"};return n=n||"",n=n.toLowerCase(),t[n]&&this.time(t[n]),this}var e=this.hour();return e<6?"night":e<12?"morning":e<17?"afternoon":e<22?"evening":"night"},dayOfYear:function(n){if(void 0!==n)return this.epoch=r.dayOfYear(this,n),this;for(var t=0,e=this.d.getMonth(),o=void 0,a=1;a<=e;a++)o=new Date,o.setYear(this.d.getFullYear()),o.setMonth(a),o.setDate(1),o.setHours(-2),t+=o.getDate();return t+this.d.getDate()},era:function(n){if(void 0!==n){n=n.toLowerCase();var t=this.d.getFullYear();return"bc"===n&&t>0&&(this.epoch=r.year(this,t*-1)),"ad"===n&&t<0&&(this.epoch=r.year(this,t*-1)),this}return this.d.getFullYear()<0?"BC":"AD"}};o.milliseconds=o.millisecond,o.seconds=o.second,o.minutes=o.minute,o.hours=o.hour,o.hour24=o.hour,o.h12=o.hour12,o.h24=o.hour24,o.days=o.day,t.exports=o},{"../set/set":30}],28:[function(n,t,e){"use strict";var r=n("../../data/days"),o=n("../../data/months"),a=n("../set/walk");t.exports={day:function n(t){if(void 0===t)return this.d.getDay();var e=this.clone(),o=t;"string"==typeof t&&(t=t.toLowerCase(),o=r.short().indexOf(t),o===-1&&(o=r.long().indexOf(t)));var n=this.d.getDay(),i=n-o,s=this.subtract(24*i,"hours");return a(s,{hour:e.hour(),minute:e.minute(),second:e.second()}),this.epoch=s.epoch,s},ampm:function(n){var t="am",e=this.hour();return e>=12&&(t="pm"),void 0===n?t:n===t?this:("am"===n?this.subtract(12,"hours"):this.add(12,"hours"),this)},dayName:function(n){return void 0===n?r.long()[this.day()]:(this.day(n),this)},monthName:function(n){return void 0===n?o.long()[this.month()]:(this.month(n),this)}}},{"../../data/days":5,"../../data/months":8,"../set/walk":31}],29:[function(n,t,e){"use strict";var r={millisecond:function(n){return n.epoch},second:function(n){return[n.year(),n.month(),n.date(),n.hour(),n.minute(),n.second()].join("-")},minute:function(n){return[n.year(),n.month(),n.date(),n.hour(),n.minute()].join("-")},hour:function(n){return[n.year(),n.month(),n.date(),n.hour()].join("-")},day:function(n){return[n.year(),n.month(),n.date()].join("-")},week:function(n){return[n.year(),n.week()].join("-")},month:function(n){return[n.year(),n.month()].join("-")},quarter:function(n){return[n.year(),n.quarter()].join("-")},year:function(n){return n.year()}};r.date=r.day;var o=function(n){n.prototype.isSame=function(t,e){var o=this;return"string"!=typeof t&&"number"!=typeof t||(t=new n(t,this.timezone.name)),e=e.replace(/s$/,""),r[e]?r[e](o)===r[e](t):null}};t.exports=o},{}],30:[function(n,t,e){"use strict";var r=n("../../data/milliseconds"),o=n("../../data/months"),a=n("../../data/monthLength"),i=n("./walk"),s=function(n){return"string"==typeof n&&(n=parseInt(n,10)),n},u=["year","month","date","hour","minute","second","millisecond"],c=function(n,t,e){for(var r=u.indexOf(e),o=u.slice(r,u.length),a=0;a<o.length;a++){var i=t[o[a]]();n[o[a]](i)}return n};t.exports={milliseconds:function(n,t){t=s(t);var e=n.millisecond(),r=e-t;return n.epoch-r},seconds:function(n,t){t=s(t);var e=n.second()-t,o=e*r.second;return n.epoch-o},minutes:function(n,t){t=s(t);var e=n.clone(),o=n.minute()-t,a=o*r.minute;return n.epoch-=a,c(n,e,"second"),n.epoch},hours:function(n,t){t=s(t);var e=n.clone(),o=n.hour()-t,a=o*r.hour;return n.epoch-=a,c(n,e,"minute"),n.epoch},time:function(n,t){var e=t.match(/([0-9]{1,2}):([0-9]{1,2})(am|pm)?/);if(!e){if(e=t.match(/([0-9]{1,2})(am|pm)/),!e)return n.epoch;e.splice(2,0,"0")}var r=!1,o=parseInt(e[1],10),a=parseInt(e[2],10);return o>12&&(r=!0),r===!1&&("am"===e[3]&&12===o&&(o=0),"pm"===e[3]&&o<12&&(o+=12)),n.hour(o),n.minute(a),n.second(0),n.millisecond(0),n.epoch},date:function(n,t){return t=s(t),i(n,{date:t}),n.epoch},month:function(n,t){"string"==typeof t&&(t=o.mapping()[t.toLowerCase()]),t=s(t);var e=n.date();return e>a[t]&&(e=a[t]),i(n,{month:t,date:e}),n.epoch},year:function(n,t){return t=s(t),i(n,{year:t}),n.epoch},dayOfYear:function(n,t){t=s(t);var e=n.clone(),o=t-n.dayOfYear(),a=o*r.day;return n.epoch+=a,c(n,e,"hour"),n.epoch}}},{"../../data/milliseconds":6,"../../data/monthLength":7,"../../data/months":8,"./walk":31}],31:[function(n,t,e){"use strict";var r=n("../../data/milliseconds"),o=function(n,t,e,o){var a=n.d[e]();if(a!==t){var i=t-a;for(n.epoch+=r[o]*i;n.d[e]()<t;)n.epoch+=r[o];for(;n.d[e]()>t;)n.epoch-=r[o]}},a={year:{valid:function(n){return n>-4e3&&n<4e3},walkTo:function(n,t){return o(n,t,"getFullYear","year")}},month:{valid:function(n){return n>=0&&n<=11},walkTo:function(n,t){var e=n.d.getMonth();if(e!==t){var o=t-e;for(n.epoch+=r.day*(28*o);n.d.getMonth()<t;)n.epoch+=r.day;for(;n.d.getMonth()>t;)n.epoch-=r.day}}},date:{valid:function(n){return n>0&&n<=31},walkTo:function(n,t){return o(n,t,"getDate","day")}},hour:{valid:function(n){return n>=0&&n<24},walkTo:function(n,t){return o(n,t,"getHours","hour")}},minute:{valid:function(n){return n>=0&&n<60},walkTo:function(n,t){return o(n,t,"getMinutes","minute")}},second:{valid:function(n){return n>=0&&n<60},walkTo:function(n,t){return o(n,t,"getSeconds","second")}},millisecond:{valid:function(n){return n>=0&&n<1e3},walkTo:function(n,t){n.milliseconds(t)}}},i=function(n,t){for(var e=Object.keys(a),r=n.clone(),o=0;o<e.length;o++){var i=e[o],s=t[i];if(void 0===s&&(s=r[i]()),"string"==typeof s&&(s=parseInt(s,10)),!a[i].valid(s))return n.valid=!1,n.epoch=null,void console.warn("invalid "+i+": "+s);a[i].walkTo(n,s)}void 0===t.hour&&n.hour()!==r.hour()&&n.hour(r.hour())};t.exports=i},{"../../data/milliseconds":6}],32:[function(n,t,e){"use strict";var r=n("../data/seasons"),o=n("../data/quarters"),a=n("./set/walk"),i={minute:function(n){return a(n,{second:0,millisecond:0}),n},quarterHour:function(n){var t=n.minutes();return t>=45?n.minutes(45):t>=30?n.minutes(30):t>=15?n.minutes(15):n.minutes(0),a(n,{second:0,millisecond:0}),n},hour:function(n){return a(n,{minute:0,second:0,millisecond:0}),n},day:function(n){return a(n,{hour:0,minute:0,second:0,millisecond:0}),n},week:function(n){var t=n.clone();return n.day(1),n.isAfter(t)&&n.subtract(1,"week"),a(n,{hour:0,minute:0,second:0,millisecond:0}),n},month:function(n){return a(n,{date:1,hour:0,minute:0,second:0,millisecond:0}),n},quarter:function(n){var t=n.quarter();return o[t]&&a(n,{month:o[t][0],date:o[t][1],hour:0,minute:0,second:0,millisecond:0}),n},season:function(n){var t=n.season(),e="north";"South"===n.timezone().hemisphere&&(e="south");for(var o=0;o<r[e].length;o++)if(r[e][o][0]===t){var i=n.year();return"winter"===t&&n.month()<3&&(i-=1),a(n,{year:i,month:r[e][o][1],date:r[e][o][2],hour:0,minute:0,second:0,millisecond:0}),n}return n},year:function(n){return a(n,{month:0,date:1,hour:0,minute:0,second:0,millisecond:0}),n}};i.date=i.day;var s=function(n,t){return i[t]?i[t](n):"summer"===t||"winter"===t?(n.season(t),i.season(n)):n},u=function(n,t){return i[t]?(n=i[t](n),n.add(1,t),n.subtract(1,"milliseconds"),n):n};t.exports={startOf:s,endOf:u}},{"../data/quarters":9,"../data/seasons":10,"./set/walk":31}],33:[function(n,t,e){"use strict";var r=n("./timezone/guessTz"),o=n("./timezone/index"),a=n("./input"),i=n("./methods"),s=n("../data"),u=function(n,t){this.tz=t||r(),this.valid=!0,Object.defineProperty(this,"d",{get:function(){var n=o(this)||{},t=new Date(this.epoch).getTimezoneOffset()||0,e=t+60*n.current.offset;e=60*e*1e3;var r=this.epoch+e,a=new Date(r);return a}}),Object.defineProperty(this,"timezones",{get:function(){return s},set:function(n){return s=n,n}}),a(this,n,t)};Object.keys(i).forEach(function(n){u.prototype[n]=i[n]}),u.prototype.clone=function(){return new u(this.epoch,this.tz)},n("./methods/query")(u),n("./methods/add")(u),n("./methods/same")(u),n("./methods/compare")(u),n("./methods/i18n")(u),t.exports=u},{"../data":1,"./input":14,"./methods":16,"./methods/add":17,"./methods/compare":18,"./methods/i18n":22,"./methods/query":26,"./methods/same":29,"./timezone/guessTz":34,"./timezone/index":35}],34:[function(n,t,e){"use strict";var r="Etc/UTC",o=function(){if("undefined"==typeof Intl||"undefined"==typeof Intl.DateTimeFormat)return null;var n=Intl.DateTimeFormat();if("undefined"==typeof n||"undefined"==typeof n.resolvedOptions)return null;var t=n.resolvedOptions().timeZone;return!t||t.indexOf("/")===-1&&"UTC"===t?null:t},a=function(){var n=o();return null===n?r:n};t.exports=a},{}],35:[function(n,t,e){"use strict";var r=n("./summerTime"),o=function(n){return n?n.split("->"):[]},a=function(n){var t=n.tz,e=n.timezones;if(!e[t])return console.warn("Warn: could not find given or local timezone - '"+t+"'"),{current:{epochShift:0}};var a={name:t,hasDst:Boolean(e[t].dst),hemisphere:"s"===e[t].h?"South":"North",change:{},current:{}};if(a.hasDst===!0){var i=o(e[t].dst);a.change={start:i[0],back:i[1]}}var s=e[t].o,u=s;return a.hasDst===!0&&(u="North"===a.hemisphere?s-1:e[t].o+1),a.hasDst===!1?(a.current.offset=s,a.current.isDST=!1):r(n,a)===!0?(a.current.offset=s,a.current.isDST="North"===a.hemisphere):(a.current.offset=u,a.current.isDST="South"===a.hemisphere),a};t.exports=a},{"./summerTime":36}],36:[function(n,t,e){"use strict";var r=n("../fns").zeroPad,o=function(n){return r(n.getMonth()+1)+"/"+r(n.getDate())+":"+r(n.getHours())},a=function(n,t){if(t.hasDst!==!0||!t.change.start||!t.change.back)return!1;var e=new Date(n.epoch),r=o(e);return r>=t.change.start&&r<t.change.back};t.exports=a},{"../fns":12}]},{},[13])(13)});
diff --git a/package.json b/package.json
index 44d759eb..6f4da290 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "spacetime",
-  "version": "3.0.1",
+  "version": "3.1.0",
   "description": "represent dates in remote timezones",
   "main": "./spacetime.js",
   "license": "Apache-2.0",
diff --git a/scratch.js b/scratch.js
index a9e329c7..b76c926c 100644
--- a/scratch.js
+++ b/scratch.js
@@ -1,14 +1,8 @@
 const spacetime = require('./src/index')
 
-// const s = spacetime(1517509494000, 'UTC')
-// s.timezones = {
-//   'UTC/fun': {
-//     o: 9,
-//     h: 'n'
-//   }
-// }
-// s.goto('UTC/fun')
-// s.debug()
+let s = spacetime([1990, 2, 2], 'UTC')
+s.log()
+
 
 // let s = spacetime([1970, 1, 1], 'UTC')
 // console.log(new Date(s.epoch * 1000))
@@ -19,10 +13,9 @@ const spacetime = require('./src/index')
 // new handy warning in spacetime@3.0
 // Fun fact: we're only subject-to these 'off-by-thousand' date errors between Sept 2001 and Jan 2057.
 
-console.time('test')
-for (let i = 0; i < 10000; i += 1) {
-  let r = parseInt(Math.random() * 5, 10)
-  let s = spacetime([1980 + r, r, 20 + r], 'UTC')
-  s.format('date')
-}
-console.timeEnd('test')
+// console.time('test')
+// for (let i = 0; i < 20000; i += 1) {
+//   let r = parseInt(Math.random() * 5, 10)
+//   let s = spacetime([1980 + r, r, 20 + r], 'UTC')
+// }
+// console.timeEnd('test')
diff --git a/spacetime.js b/spacetime.js
index c9ee69c5..9b008265 100644
--- a/spacetime.js
+++ b/spacetime.js
@@ -1,5 +1,5 @@
-/* spacetime v3.0.1
+/* spacetime v3.1.0
   
 */
-!function(n){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=n();else if("function"==typeof define&&define.amd)define([],n);else{var t;t="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,t.spacetime=n()}}(function(){return function n(t,e,r){function o(i,s){if(!e[i]){if(!t[i]){var u="function"==typeof require&&require;if(!s&&u)return u(i,!0);if(a)return a(i,!0);var c=new Error("Cannot find module '"+i+"'");throw c.code="MODULE_NOT_FOUND",c}var h=e[i]={exports:{}};t[i][0].call(h.exports,function(n){var e=t[i][1][n];return o(e?e:n)},h,h.exports,n,t,e,r)}return e[i].exports}for(var a="function"==typeof require&&require,i=0;i<r.length;i++)o(r[i]);return o}({1:[function(n,t,e){"use strict";var r=n("./zonefile.2017.json"),o={Australia:!0,Chile:!0,Brazil:!0,Antarctica:!0},a=function(n){var t={},e=Object.keys(n);return e.forEach(function(e){var r=Object.keys(n[e]);r.forEach(function(r){var 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n.epoch-n.startOf("day").epoch},z:function(n){return n.timezone().name},zz:function(n){return n.timezone().name},zzz:function(n){return n.timezone().name},zzzz:function(n){return n.timezone().name},Z:function(n){return n.timezone().current.offset+"00"},ZZ:function(n){return n.timezone().current.offset+"00"},ZZZ:function(n){return n.timezone().current.offset+"00"},ZZZZ:function(n){return n.timezone().current.offset+":00"}},a=function(n,t,e){for(var r=n,a=t,i=0;i<e;i+=1)o[r]=o[a],r+=n,a+=t};a("q","Q",4),a("L","M",4),a("Y","y",4),a("c","e",4),a("k","H",2),a("K","h",2),a("S","s",2),a("v","z",4),a("V","Z",4);var i=function(n,t){for(var e=n.split(""),r=[e[0]],a=!1,i=1;i<e.length;i+=1){if("'"===e[i]){if(a=!a,a!==!0||!e[i+1]||"'"!==e[i+1])continue;a=!0}a===!0||e[i]===r[r.length-1][0]?r[r.length-1]+=e[i]:r.push(e[i])}return r.reduce(function(n,e){return n+=void 0!==o[e]?o[e](t)||"":e},"")};t.exports=i},{"../../fns":12}],22:[function(n,t,e){"use strict";var r=n("../fns"),o=n("../data/days"),a=n("../data/months"),i=function(n){var t={i18n:function(n){if(!(r.isObject(n)&&r.isObject(n.days)&&r.isObject(n.months)&&r.isArray(n.days.short)&&r.isArray(n.days.long)&&r.isArray(n.months.short)&&r.isArray(n.months.long)))throw new Error("Invalid i18n payload passed.");o.set(n.days),a.set(n.months)}};Object.keys(t).forEach(function(e){
+n.prototype[e]=t[e]})};t.exports=i},{"../data/days":5,"../data/months":8,"../fns":12}],23:[function(n,t,e){"use strict";var r=function(n,t){t=t.toLowerCase(),t=t.replace(/s$/,"");var e=n.progress();return void 0!==e[t]?(e[t]>.5&&n.add(1,t),n.startOf(t)):console.warn("no known unit '"+t+"'"),n};t.exports=r},{}],24:[function(n,t,e){"use strict";var r=function(n){var t=["year","season","quarter","month","week","day","quarterHour","hour","minute"],e={};return t.forEach(function(t){var r=n.clone().startOf(t),o=n.clone().endOf(t),a=o.epoch-r.epoch,i=(n.epoch-r.epoch)/a;e[t]=parseFloat(i.toFixed(2))}),e};t.exports=r},{}],25:[function(n,t,e){"use strict";var r=n("../../data/quarters"),o=n("../../data/seasons"),a=n("../set/set"),i=function(n){n.minute(0),n.second(0),n.millisecond(1)};t.exports={time:function(n){return void 0!==n?(this.epoch=a.time(this,n),this):this.format("time-h12")},week:function(n){if(void 0!==n)return this.month(0),this.date(1),this.day("monday"),i(this),"december"===this.monthName()&&this.add(1,"week"),n-=1,this.add(n,"weeks"),this;var t=this.clone();t.month(0),t.date(1),i(t),t.day("monday"),"december"===t.monthName()&&t.add(1,"week");var e=this.epoch;if(t.epoch>e)return 1;for(var r=0;r<52;r++){if(t.epoch>e)return r;t.add(1,"week")}return 52},quarter:function(n){if(void 0!==n&&("string"==typeof n&&(n=n.replace(/^q/i,""),n=parseInt(n,10)),r[n])){var t=r[n][0];return this.month(t),this.date(1),this.hour(0),i(this),this}for(var e=this.d.getMonth(),o=1;o<r.length;o++)if(e<r[o][0])return o-1;return 4},hourFloat:function(n){if(void 0!==n){var t=n%1;t=60*t;var e=parseInt(n,10);return this.epoch=a.hours(this,e),this.epoch=a.minutes(this,t),this}var r=this.d,o=r.getHours(),i=r.getMinutes();return i/=60,o+i},season:function(n){var t="north";if("South"===this.timezone().hemisphere&&(t="south"),void 0!==n){for(var e=0;e<o[t].length;e++)n===o[t][e][0]&&(this.month(o[t][e][1]),this.date(1),this.hour(0),i(this));return this}for(var r=this.d.getMonth(),a=0;a<o[t].length-1;a++)if(r>=o[t][a][1]&&r<o[t][a+1][1])return o[t][a][0];return"winter"}}},{"../../data/quarters":9,"../../data/seasons":10,"../set/set":30}],26:[function(n,t,e){"use strict";var r=n("./normal"),o=n("./destructive"),a=n("./tricky"),i=function(n){Object.keys(r).forEach(function(t){n.prototype[t]=r[t]}),Object.keys(o).forEach(function(t){n.prototype[t]=o[t]}),Object.keys(a).forEach(function(t){n.prototype[t]=a[t]})};t.exports=i},{"./destructive":25,"./normal":27,"./tricky":28}],27:[function(n,t,e){"use strict";var r=n("../set/set"),o={millisecond:function(n){return void 0!==n?(this.epoch=r.milliseconds(this,n),this):this.d.getMilliseconds()},second:function(n){return void 0!==n?(this.epoch=r.seconds(this,n),this):this.d.getSeconds()},minute:function(n){return void 0!==n?(this.epoch=r.minutes(this,n),this):this.d.getMinutes()},hour:function(n){var t=this.d;return void 0!==n?(this.epoch=r.hours(this,n),this):t.getHours()},hour12:function n(t){var e=this.d;if(void 0!==t){t=""+t;var o=t.match(/^([0-9]+)(am|pm)$/);if(o){var a=parseInt(o[1],10);"pm"===o[2]&&(a+=12),this.epoch=r.hours(this,a)}return this}var n=e.getHours();return n>12&&(n-=12),0===n&&(n=12),n},date:function(n){return void 0!==n?(this.epoch=r.date(this,n),this):this.d.getDate()},month:function(n){return void 0!==n?(this.epoch=r.month(this,n),this):this.d.getMonth()},year:function(n){return void 0!==n?(this.epoch=r.year(this,n),this):this.d.getFullYear()},dayTime:function(n){if(void 0!==n){var t={morning:"7:00am",breakfast:"7:00am",noon:"12:00am",lunch:"12:00pm",afternoon:"2:00pm",evening:"6:00pm",dinner:"6:00pm",night:"11:00pm",midnight:"23:59pm"};return n=n||"",n=n.toLowerCase(),t[n]&&this.time(t[n]),this}var e=this.hour();return e<6?"night":e<12?"morning":e<17?"afternoon":e<22?"evening":"night"},dayOfYear:function(n){if(void 0!==n)return this.epoch=r.dayOfYear(this,n),this;for(var t=0,e=this.d.getMonth(),o=void 0,a=1;a<=e;a++)o=new Date,o.setYear(this.d.getFullYear()),o.setMonth(a),o.setDate(1),o.setHours(-2),t+=o.getDate();return t+this.d.getDate()},era:function(n){if(void 0!==n){n=n.toLowerCase();var t=this.d.getFullYear();return"bc"===n&&t>0&&(this.epoch=r.year(this,t*-1)),"ad"===n&&t<0&&(this.epoch=r.year(this,t*-1)),this}return this.d.getFullYear()<0?"BC":"AD"}};o.milliseconds=o.millisecond,o.seconds=o.second,o.minutes=o.minute,o.hours=o.hour,o.hour24=o.hour,o.h12=o.hour12,o.h24=o.hour24,o.days=o.day,t.exports=o},{"../set/set":30}],28:[function(n,t,e){"use strict";var r=n("../../data/days"),o=n("../../data/months"),a=n("../set/walk");t.exports={day:function n(t){if(void 0===t)return this.d.getDay();var e=this.clone(),o=t;"string"==typeof t&&(t=t.toLowerCase(),o=r.short().indexOf(t),o===-1&&(o=r.long().indexOf(t)));var n=this.d.getDay(),i=n-o,s=this.subtract(24*i,"hours");return a(s,{hour:e.hour(),minute:e.minute(),second:e.second()}),this.epoch=s.epoch,s},ampm:function(n){var t="am",e=this.hour();return e>=12&&(t="pm"),void 0===n?t:n===t?this:("am"===n?this.subtract(12,"hours"):this.add(12,"hours"),this)},dayName:function(n){return void 0===n?r.long()[this.day()]:(this.day(n),this)},monthName:function(n){return void 0===n?o.long()[this.month()]:(this.month(n),this)}}},{"../../data/days":5,"../../data/months":8,"../set/walk":31}],29:[function(n,t,e){"use strict";var r={millisecond:function(n){return n.epoch},second:function(n){return[n.year(),n.month(),n.date(),n.hour(),n.minute(),n.second()].join("-")},minute:function(n){return[n.year(),n.month(),n.date(),n.hour(),n.minute()].join("-")},hour:function(n){return[n.year(),n.month(),n.date(),n.hour()].join("-")},day:function(n){return[n.year(),n.month(),n.date()].join("-")},week:function(n){return[n.year(),n.week()].join("-")},month:function(n){return[n.year(),n.month()].join("-")},quarter:function(n){return[n.year(),n.quarter()].join("-")},year:function(n){return n.year()}};r.date=r.day;var o=function(n){n.prototype.isSame=function(t,e){var o=this;return"string"!=typeof t&&"number"!=typeof t||(t=new n(t,this.timezone.name)),e=e.replace(/s$/,""),r[e]?r[e](o)===r[e](t):null}};t.exports=o},{}],30:[function(n,t,e){"use strict";var r=n("../../data/milliseconds"),o=n("../../data/months"),a=n("../../data/monthLength"),i=n("./walk"),s=function(n){return"string"==typeof n&&(n=parseInt(n,10)),n},u=["year","month","date","hour","minute","second","millisecond"],c=function(n,t,e){for(var r=u.indexOf(e),o=u.slice(r,u.length),a=0;a<o.length;a++){var i=t[o[a]]();n[o[a]](i)}return n};t.exports={milliseconds:function(n,t){t=s(t);var e=n.millisecond(),r=e-t;return n.epoch-r},seconds:function(n,t){t=s(t);var e=n.second()-t,o=e*r.second;return n.epoch-o},minutes:function(n,t){t=s(t);var e=n.clone(),o=n.minute()-t,a=o*r.minute;return n.epoch-=a,c(n,e,"second"),n.epoch},hours:function(n,t){t=s(t);var e=n.clone(),o=n.hour()-t,a=o*r.hour;return n.epoch-=a,c(n,e,"minute"),n.epoch},time:function(n,t){var e=t.match(/([0-9]{1,2}):([0-9]{1,2})(am|pm)?/);if(!e){if(e=t.match(/([0-9]{1,2})(am|pm)/),!e)return n.epoch;e.splice(2,0,"0")}var r=!1,o=parseInt(e[1],10),a=parseInt(e[2],10);return o>12&&(r=!0),r===!1&&("am"===e[3]&&12===o&&(o=0),"pm"===e[3]&&o<12&&(o+=12)),n.hour(o),n.minute(a),n.second(0),n.millisecond(0),n.epoch},date:function(n,t){return t=s(t),i(n,{date:t}),n.epoch},month:function(n,t){"string"==typeof t&&(t=o.mapping()[t.toLowerCase()]),t=s(t);var e=n.date();return e>a[t]&&(e=a[t]),i(n,{month:t,date:e}),n.epoch},year:function(n,t){return t=s(t),i(n,{year:t}),n.epoch},dayOfYear:function(n,t){t=s(t);var e=n.clone(),o=t-n.dayOfYear(),a=o*r.day;return n.epoch+=a,c(n,e,"hour"),n.epoch}}},{"../../data/milliseconds":6,"../../data/monthLength":7,"../../data/months":8,"./walk":31}],31:[function(n,t,e){"use strict";var r=n("../../data/milliseconds"),o=function(n,t,e,o){var a=n.d[e]();if(a!==t){var i=t-a;for(n.epoch+=r[o]*i;n.d[e]()<t;)n.epoch+=r[o];for(;n.d[e]()>t;)n.epoch-=r[o]}},a={year:{valid:function(n){return n>-4e3&&n<4e3},walkTo:function(n,t){return o(n,t,"getFullYear","year")}},month:{valid:function(n){return n>=0&&n<=11},walkTo:function(n,t){var e=n.d.getMonth();if(e!==t){var o=t-e;for(n.epoch+=r.day*(28*o);n.d.getMonth()<t;)n.epoch+=r.day;for(;n.d.getMonth()>t;)n.epoch-=r.day}}},date:{valid:function(n){return n>0&&n<=31},walkTo:function(n,t){return o(n,t,"getDate","day")}},hour:{valid:function(n){return n>=0&&n<24},walkTo:function(n,t){return o(n,t,"getHours","hour")}},minute:{valid:function(n){return n>=0&&n<60},walkTo:function(n,t){return o(n,t,"getMinutes","minute")}},second:{valid:function(n){return n>=0&&n<60},walkTo:function(n,t){return o(n,t,"getSeconds","second")}},millisecond:{valid:function(n){return n>=0&&n<1e3},walkTo:function(n,t){n.milliseconds(t)}}},i=function(n,t){for(var e=Object.keys(a),r=n.clone(),o=0;o<e.length;o++){var i=e[o],s=t[i];if(void 0===s&&(s=r[i]()),"string"==typeof s&&(s=parseInt(s,10)),!a[i].valid(s))return n.valid=!1,n.epoch=null,void console.warn("invalid "+i+": "+s);a[i].walkTo(n,s)}void 0===t.hour&&n.hour()!==r.hour()&&n.hour(r.hour())};t.exports=i},{"../../data/milliseconds":6}],32:[function(n,t,e){"use strict";var r=n("../data/seasons"),o=n("../data/quarters"),a=n("./set/walk"),i={minute:function(n){return a(n,{second:0,millisecond:0}),n},quarterHour:function(n){var t=n.minutes();return t>=45?n.minutes(45):t>=30?n.minutes(30):t>=15?n.minutes(15):n.minutes(0),a(n,{second:0,millisecond:0}),n},hour:function(n){return a(n,{minute:0,second:0,millisecond:0}),n},day:function(n){return a(n,{hour:0,minute:0,second:0,millisecond:0}),n},week:function(n){var t=n.clone();return n.day(1),n.isAfter(t)&&n.subtract(1,"week"),a(n,{hour:0,minute:0,second:0,millisecond:0}),n},month:function(n){return a(n,{date:1,hour:0,minute:0,second:0,millisecond:0}),n},quarter:function(n){var t=n.quarter();return o[t]&&a(n,{month:o[t][0],date:o[t][1],hour:0,minute:0,second:0,millisecond:0}),n},season:function(n){var t=n.season(),e="north";"South"===n.timezone().hemisphere&&(e="south");for(var o=0;o<r[e].length;o++)if(r[e][o][0]===t){var i=n.year();return"winter"===t&&n.month()<3&&(i-=1),a(n,{year:i,month:r[e][o][1],date:r[e][o][2],hour:0,minute:0,second:0,millisecond:0}),n}return n},year:function(n){return a(n,{month:0,date:1,hour:0,minute:0,second:0,millisecond:0}),n}};i.date=i.day;var s=function(n,t){return i[t]?i[t](n):"summer"===t||"winter"===t?(n.season(t),i.season(n)):n},u=function(n,t){return i[t]?(n=i[t](n),n.add(1,t),n.subtract(1,"milliseconds"),n):n};t.exports={startOf:s,endOf:u}},{"../data/quarters":9,"../data/seasons":10,"./set/walk":31}],33:[function(n,t,e){"use strict";var r=n("./timezone/guessTz"),o=n("./timezone/index"),a=n("./input"),i=n("./methods"),s=n("../data"),u=function(n,t){this.tz=t||r(),this.valid=!0,Object.defineProperty(this,"d",{get:function(){var n=o(this)||{},t=new Date(this.epoch).getTimezoneOffset()||0,e=t+60*n.current.offset;e=60*e*1e3;var r=this.epoch+e,a=new Date(r);return a}}),Object.defineProperty(this,"timezones",{get:function(){return s},set:function(n){return s=n,n}}),a(this,n,t)};Object.keys(i).forEach(function(n){u.prototype[n]=i[n]}),u.prototype.clone=function(){return new u(this.epoch,this.tz)},n("./methods/query")(u),n("./methods/add")(u),n("./methods/same")(u),n("./methods/compare")(u),n("./methods/i18n")(u),t.exports=u},{"../data":1,"./input":14,"./methods":16,"./methods/add":17,"./methods/compare":18,"./methods/i18n":22,"./methods/query":26,"./methods/same":29,"./timezone/guessTz":34,"./timezone/index":35}],34:[function(n,t,e){"use strict";var r="Etc/UTC",o=function(){if("undefined"==typeof Intl||"undefined"==typeof Intl.DateTimeFormat)return null;var n=Intl.DateTimeFormat();if("undefined"==typeof n||"undefined"==typeof n.resolvedOptions)return null;var t=n.resolvedOptions().timeZone;return!t||t.indexOf("/")===-1&&"UTC"===t?null:t},a=function(){var n=o();return null===n?r:n};t.exports=a},{}],35:[function(n,t,e){"use strict";var r=n("./summerTime"),o=function(n){return n?n.split("->"):[]},a=function(n){var t=n.tz,e=n.timezones;if(!e[t])return console.warn("Warn: could not find given or local timezone - '"+t+"'"),{current:{epochShift:0}};var a={name:t,hasDst:Boolean(e[t].dst),hemisphere:"s"===e[t].h?"South":"North",change:{},current:{}};if(a.hasDst===!0){var i=o(e[t].dst);a.change={start:i[0],back:i[1]}}var s=e[t].o,u=s;return a.hasDst===!0&&(u="North"===a.hemisphere?s-1:e[t].o+1),a.hasDst===!1?(a.current.offset=s,a.current.isDST=!1):r(n,a)===!0?(a.current.offset=s,a.current.isDST="North"===a.hemisphere):(a.current.offset=u,a.current.isDST="South"===a.hemisphere),a};t.exports=a},{"./summerTime":36}],36:[function(n,t,e){"use strict";var r=n("../fns").zeroPad,o=function(n){return r(n.getMonth()+1)+"/"+r(n.getDate())+":"+r(n.getHours())},a=function(n,t){if(t.hasDst!==!0||!t.change.start||!t.change.back)return!1;var e=new Date(n.epoch),r=o(e);return r>=t.change.start&&r<t.change.back};t.exports=a},{"../fns":12}]},{},[13])(13)});
diff --git a/src/input/index.js b/src/input/index.js
index dce263ee..a440313f 100644
--- a/src/input/index.js
+++ b/src/input/index.js
@@ -40,7 +40,7 @@ const handleObject = function(s, obj) {
 };
 
 //find the epoch from different input styles
-const parseInput = (s, input) => {
+const parseInput = (s, input, givenTz) => {
   //if we've been given a epoch number, it's easy
   if (typeof input === 'number') {
     s.epoch = input;
@@ -81,7 +81,7 @@ const parseInput = (s, input) => {
   for (let i = 0; i < strFmt.length; i++) {
     let m = input.match(strFmt[i].reg);
     if (m) {
-      strFmt[i].parse(s, m);
+      strFmt[i].parse(s, m, givenTz);
       return;
     }
   }
diff --git a/src/input/strParse.js b/src/input/strParse.js
index 7097dc0e..a2137ba6 100644
--- a/src/input/strParse.js
+++ b/src/input/strParse.js
@@ -17,7 +17,7 @@ const parseHour = function(s, str) {
     }
   }
 };
-const parseOffset = function(s, offset) {
+const parseOffset = function(s, offset, givenTz) {
   if (!offset) {
     return s
   }
@@ -52,6 +52,15 @@ const parseOffset = function(s, offset) {
   let zones = s.timezones
   if (zones[tz]) {
     // console.log('changing timezone to: ' + tz)
+    //log a warning if we're over-writing a given timezone
+    if (givenTz && zones[givenTz] && zones[givenTz].o !== zones[tz].o) {
+      //don't log during our tests, either..
+      if (typeof process !== 'undefined' && process.env && !process.env.TESTENV) {
+        console.warn('  - Setting timezone to: \'' + tz + '\'')
+        console.warn('     from ISO string \'' + offset + '\'')
+        console.warn('     overwriting given timezone: \'' + givenTz + '\'\n')
+      }
+    }
     s.tz = tz
   }
   return s
@@ -61,9 +70,9 @@ const strFmt = [
   //iso-this 1998-05-30T22:00:00:000Z, iso-that 2017-04-03T08:00:00-0700
   {
     reg: /^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})T([0-9.:]+)(Z|[0-9\-\+:]+)?$/,
-    parse: (s, arr) => {
+    parse: (s, arr, givenTz) => {
       let month = parseInt(arr[2], 10) - 1;
-      parseOffset(s, arr[5]);
+      parseOffset(s, arr[5], givenTz);
       walkTo(s, {
         year: arr[1],
         month: month,
diff --git a/src/methods/format/unixFmt.js b/src/methods/format/unixFmt.js
index 84e151e3..c3059561 100644
--- a/src/methods/format/unixFmt.js
+++ b/src/methods/format/unixFmt.js
@@ -26,9 +26,9 @@ const mapping = {
   QQQQ: (s) => s.quarter(),
 
   //month
-  M: (s) => s.month(),
-  MM: (s) => s.format('month-short'),
-  MMM: (s) => s.format('month'),
+  M: (s) => s.month() + 1,
+  MM: (s) => pad(s.month() + 1),
+  MMM: (s) => s.format('month-short'),
   MMMM: (s) => s.format('month'),
 
   //week
diff --git a/src/methods/set/walk.js b/src/methods/set/walk.js
index dd82baa1..ad72d13e 100644
--- a/src/methods/set/walk.js
+++ b/src/methods/set/walk.js
@@ -1,73 +1,63 @@
 'use strict';
 const ms = require('../../data/milliseconds');
 
+//basically, step-forward/backward until js Date object says we're there.
+const walk = function(s, n, fn, unit) {
+  let current = s.d[fn]()
+  if (current === n) {
+    return
+  }
+  //try to get it as close as we can
+  let diff = (n - current)
+  s.epoch += ms[unit] * diff
+
+  while (s.d[fn]() < n) {
+    s.epoch += ms[unit];
+  }
+  while (s.d[fn]() > n) {
+    s.epoch -= ms[unit];
+  }
+}
 //find the desired date by a increment/check while loop
 const units = {
   year: {
     valid: n => n > -4000 && n < 4000,
-    walkTo: (s, n) => {
-      while (s.year() < n) {
-        s.epoch += ms.year;
-      }
-      while (s.year() > n) {
-        s.epoch -= ms.year;
-      }
-    },
+    walkTo: (s, n) => walk(s, n, 'getFullYear', 'year')
   },
   month: {
     valid: n => n >= 0 && n <= 11,
     walkTo: (s, n) => {
-      while (s.month() < n) {
+      let current = s.d.getMonth()
+      if (current === n) {
+        return
+      }
+      //try to get it as close as we can..
+      let diff = (n - current)
+      s.epoch += ms.day * (diff * 28)
+      //incriment by day
+      while (s.d.getMonth() < n) {
         s.epoch += ms.day;
       }
-      while (s.month() > n) {
+      while (s.d.getMonth() > n) {
         s.epoch -= ms.day;
       }
     },
   },
   date: {
     valid: n => n > 0 && n <= 31,
-    walkTo: (s, n) => {
-      while (s.date() < n) {
-        s.epoch += ms.day;
-      }
-      while (s.date() > n) {
-        s.epoch -= ms.day;
-      }
-    },
+    walkTo: (s, n) => walk(s, n, 'getDate', 'day')
   },
   hour: {
     valid: n => n >= 0 && n < 24,
-    walkTo: (s, n) => {
-      while (s.hour() < n) {
-        s.epoch += ms.hour;
-      }
-      while (s.hour() > n) {
-        s.epoch -= ms.hour;
-      }
-    },
+    walkTo: (s, n) => walk(s, n, 'getHours', 'hour')
   },
   minute: {
     valid: n => n >= 0 && n < 60,
-    walkTo: (s, n) => {
-      while (s.minute() < n) {
-        s.epoch += ms.minute;
-      }
-      while (s.minute() > n) {
-        s.epoch -= ms.minute;
-      }
-    },
+    walkTo: (s, n) => walk(s, n, 'getMinutes', 'minute')
   },
   second: {
     valid: n => n >= 0 && n < 60,
-    walkTo: (s, n) => {
-      while (s.second() < n) {
-        s.epoch += ms.second;
-      }
-      while (s.second() > n) {
-        s.epoch -= ms.second;
-      }
-    },
+    walkTo: (s, n) => walk(s, n, 'getSeconds', 'second')
   },
   millisecond: {
     valid: n => n >= 0 && n < 1000,
diff --git a/src/spacetime.js b/src/spacetime.js
index 43783cc1..7217019b 100644
--- a/src/spacetime.js
+++ b/src/spacetime.js
@@ -38,7 +38,7 @@ const SpaceTime = function(input, tz) {
     }
   })
   //parse the various formats
-  handleInput(this, input)
+  handleInput(this, input, tz)
 }
 
 //(add instance methods to prototype)
diff --git a/test/format.test.js b/test/format.test.js
index 8e94c20d..a2f5bfad 100644
--- a/test/format.test.js
+++ b/test/format.test.js
@@ -34,15 +34,27 @@ test('unix-formatting', t => {
   //examples from http://unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns
   let arr = [
     ['h:mm a', '11:34 AM'],
-    ['LL', 'Nov'],
-    [`yyyy.MM.dd G 'at' HH:mm:ss zzz`, '2017.Nov.16 AD at 11:34:25 Canada/Eastern'],
-    [`EEE, MMM d, ''yy`, 'Thu, November 16, \'17'],
+    ['LLL', 'Nov'],
+    [`yyyy.MM.dd G 'at' HH:mm:ss zzz`, '2017.11.16 AD at 11:34:25 Canada/Eastern'],
+    [`EEE, MMM d, ''yy`, 'Thu, Nov 16, \'17'],
     [`hh 'o''clock' a`, '11 oclock AM'],
     ['yyyyy.MMMM.dd GGG hh:mm aaa', '02017.November.16 AD 11:34 AM'],
   ]
   arr.forEach((a) => {
     t.equal(s.format(a[0]), a[1], a[0])
   })
+
+  //test another date
+  s = spacetime([2018, 'February', 20], 'Canada/Eastern')
+  arr = [
+    ['M', '2'],
+    ['MM', '02'],
+    ['MMM', 'Feb'],
+    ['MMMM', 'February']
+  ]
+  arr.forEach((a) => {
+    t.equal(s.format(a[0]), a[1], a[0])
+  })
   t.end();
 });