diff --git a/CHANGELOG.md b/CHANGELOG.md
index 34fea2c81..cb5ca1247 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 #### HEAD
 
+- Fix `isDate()` handling of ISO8601 timezones
+  ([#444](https://github.com/chriso/validator.js/pull/444))
 - Fix the incorrect `isFloat('.') === true`
   ([#443](https://github.com/chriso/validator.js/pull/443))
 - Added a Norwegian locale to `isMobilePhone()`
diff --git a/test/validators.js b/test/validators.js
index 0108de70f..e4d55b6ed 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -889,6 +889,11 @@ describe('Validators', function () {
               , '2009-05-19 14:39:22-06:00'
               , '2009-05-19 14:39:22+0600'
               , '2009-05-19 14:39:22-01'
+              , '2015-10-20T00:53:09+08:00'
+              , '2015-10-20T00:53:09+09:00'
+              , '2015-10-20T00:53:09+10:00'
+              , '2015-10-20T00:53:09+11:00'
+              , '2015-10-20T00:53:09+12:00'
               , '2007-04-06T00:00'
               , '2010-02-18T16:23:48.5'
               , '200905'
diff --git a/validator.js b/validator.js
index 34919f6a5..65482f78f 100644
--- a/validator.js
+++ b/validator.js
@@ -470,10 +470,37 @@
         return pattern && pattern.test(str);
     };
 
+    function getTimezoneOffset(str) {
+        var iso8601Parts = str.match(iso8601);
+        if (!iso8601Parts) {
+            return new Date().getTimezoneOffset();
+        }
+        var timezone = iso8601Parts[21];
+        if (!timezone || timezone === 'z' || timezone === 'Z') {
+            return 0;
+        }
+        var sign = iso8601Parts[22], hours, minutes;
+        if (timezone.indexOf(':') !== -1) {
+            hours = parseInt(iso8601Parts[23]);
+            minutes = parseInt(iso8601Parts[24]);
+        } else {
+            hours = 0;
+            minutes = parseInt(iso8601Parts[23]);
+        }
+        return (hours * 60 + minutes) * (sign === '-' ? 1 : -1);
+    }
+
     validator.isDate = function (str) {
         var normalizedDate = new Date((new Date(str)).toUTCString());
-        var regularDay = String(normalizedDate.getDate());
         var utcDay = String(normalizedDate.getUTCDate());
+        // normalizedDate is in the user's timezone. Apply the input
+        // timezone offset to the date so that the year and day match
+        // the input
+        var timezoneDifference = normalizedDate.getTimezoneOffset() -
+            getTimezoneOffset(str);
+        normalizedDate = new Date(normalizedDate.getTime() +
+            60000 * timezoneDifference);
+        var regularDay = String(normalizedDate.getDate());
         var dayOrYear, dayOrYearMatches, year;
         if (isNaN(Date.parse(normalizedDate))) {
             return false;
diff --git a/validator.min.js b/validator.min.js
index 92e5aae59..63085eac9 100644
--- a/validator.min.js
+++ b/validator.min.js
@@ -20,4 +20,4 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-!function(t,e){"undefined"!=typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&"object"==typeof define.amd?define(e):this[t]=e()}("validator",function(t){"use strict";function e(t,e){t=t||{};for(var r in e)"undefined"==typeof t[r]&&(t[r]=e[r]);return t}function r(t){var e="(\\"+t.symbol.replace(/\./g,"\\.")+")"+(t.require_symbol?"":"?"),r="-?",n="[1-9]\\d*",i="[1-9]\\d{0,2}(\\"+t.thousands_separator+"\\d{3})*",o=["0",n,i],u="("+o.join("|")+")?",a="(\\"+t.decimal_separator+"\\d{2})?",s=u+a;return t.allow_negatives&&!t.parens_for_negatives&&(t.negative_sign_after_digits?s+=r:t.negative_sign_before_digits&&(s=r+s)),t.allow_negative_sign_placeholder?s="( (?!\\-))?"+s:t.allow_space_after_symbol?s=" ?"+s:t.allow_space_after_digits&&(s+="( (?!$))?"),t.symbol_after_digits?s+=e:s=e+s,t.allow_negatives&&(t.parens_for_negatives?s="(\\("+s+"\\)|"+s+")":t.negative_sign_before_digits||t.negative_sign_after_digits||(s=r+s)),new RegExp("^(?!-? )(?=.*\\d)"+s+"$")}t={version:"4.1.0"};var n=/^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~]+$/i,i=/^([\s\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e]|(\\[\x01-\x09\x0b\x0c\x0d-\x7f]))*$/i,o=/^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+$/i,u=/^([\s\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|(\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*$/i,a=/^[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\.\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+[a-z\d!#\$%&'\*\+\-\/=\?\^_`{\|}~\.\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF\s]*<(.+)>$/i,s=/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$/,l=/^[A-Z]{2}[0-9A-Z]{9}[0-9]$/,f=/^(?:[0-9]{9}X|[0-9]{10})$/,c=/^(?:[0-9]{13})$/,g=/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/,p=/^[0-9A-F]{1,4}$/i,d={3:/^[0-9A-F]{8}-[0-9A-F]{4}-3[0-9A-F]{3}-[0-9A-F]{4}-[0-9A-F]{12}$/i,4:/^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i,5:/^[0-9A-F]{8}-[0-9A-F]{4}-5[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i,all:/^[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}$/i},F=/^[A-Z]+$/i,_=/^[0-9A-Z]+$/i,x=/^[-+]?[0-9]+$/,h=/^(?:[-+]?(?:0|[1-9][0-9]*))$/,v=/^(?:[-+]?(?:[0-9]+))?(?:\.[0-9]*)?(?:[eE][\+\-]?(?:[0-9]+))?$/,A=/^[0-9A-F]+$/i,$=/^[-+]?([0-9]+|\.[0-9]+|[0-9]+\.[0-9]+)$/,m=/^#?([0-9A-F]{3}|[0-9A-F]{6})$/i,w=/^[\x00-\x7F]+$/,D=/[^\x00-\x7F]/,b=/[^\u0020-\u007E\uFF61-\uFF9F\uFFA0-\uFFDC\uFFE8-\uFFEE0-9a-zA-Z]/,y=/[\u0020-\u007E\uFF61-\uFF9F\uFFA0-\uFFDC\uFFE8-\uFFEE0-9a-zA-Z]/,E=/[\uD800-\uDBFF][\uDC00-\uDFFF]/,S=/^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=|[A-Z0-9+\/]{4})$/i,O={"zh-CN":/^(\+?0?86\-?)?1[345789]\d{9}$/,"zh-TW":/^(\+?886\-?|0)?9\d{8}$/,"en-ZA":/^(\+?27|0)\d{9}$/,"en-AU":/^(\+?61|0)4\d{8}$/,"en-HK":/^(\+?852\-?)?[569]\d{3}\-?\d{4}$/,"fr-FR":/^(\+?33|0)[67]\d{8}$/,"pt-PT":/^(\+351)?9[1236]\d{7}$/,"el-GR":/^(\+30)?((2\d{9})|(69\d{8}))$/,"en-GB":/^(\+?44|0)7\d{9}$/,"en-US":/^(\+?1)?[2-9]\d{2}[2-9](?!11)\d{6}$/,"en-ZM":/^(\+26)?09[567]\d{7}$/,"ru-RU":/^(\+?7|8)?9\d{9}$/,"nb-NO":/^(\+?47)?[49]\d{7}$/,"nn-NO":/^(\+?47)?[49]\d{7}$/},C=/^([\+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24\:?00)([\.,]\d+(?!:))?)?(\17[0-5]\d([\.,]\d+)?)?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/;t.extend=function(e,r){t[e]=function(){var e=Array.prototype.slice.call(arguments);return e[0]=t.toString(e[0]),r.apply(t,e)}},t.init=function(){for(var e in t)"function"==typeof t[e]&&"toString"!==e&&"toDate"!==e&&"extend"!==e&&"init"!==e&&t.extend(e,t[e])},t.toString=function(t){return"object"==typeof t&&null!==t&&t.toString?t=t.toString():(null===t||"undefined"==typeof t||isNaN(t)&&!t.length)&&(t=""),""+t},t.toDate=function(t){return"[object Date]"===Object.prototype.toString.call(t)?t:(t=Date.parse(t),isNaN(t)?null:new Date(t))},t.toFloat=function(t){return parseFloat(t)},t.toInt=function(t,e){return parseInt(t,e||10)},t.toBoolean=function(t,e){return e?"1"===t||"true"===t:"0"!==t&&"false"!==t&&""!==t},t.equals=function(e,r){return e===t.toString(r)},t.contains=function(e,r){return e.indexOf(t.toString(r))>=0},t.matches=function(t,e,r){return"[object RegExp]"!==Object.prototype.toString.call(e)&&(e=new RegExp(e,r)),e.test(t)};var I={allow_display_name:!1,allow_utf8_local_part:!0,require_tld:!0};t.isEmail=function(r,s){if(s=e(s,I),s.allow_display_name){var l=r.match(a);l&&(r=l[1])}var f=r.split("@"),c=f.pop(),g=f.join("@"),p=c.toLowerCase();if(("gmail.com"===p||"googlemail.com"===p)&&(g=g.replace(/\./g,"").toLowerCase()),!t.isByteLength(g,0,64)||!t.isByteLength(c,0,256))return!1;if(!t.isFQDN(c,{require_tld:s.require_tld}))return!1;if('"'===g[0])return g=g.slice(1,g.length-1),s.allow_utf8_local_part?u.test(g):i.test(g);for(var d=s.allow_utf8_local_part?o:n,F=g.split("."),_=0;_<F.length;_++)if(!d.test(F[_]))return!1;return!0};var N={protocols:["http","https","ftp"],require_tld:!0,require_protocol:!1,require_valid_protocol:!0,allow_underscores:!1,allow_trailing_dot:!1,allow_protocol_relative_urls:!1};t.isURL=function(r,n){if(!r||r.length>=2083||/\s/.test(r))return!1;if(0===r.indexOf("mailto:"))return!1;n=e(n,N);var i,o,u,a,s,l,f;if(f=r.split("://"),f.length>1){if(i=f.shift(),n.require_valid_protocol&&-1===n.protocols.indexOf(i))return!1}else{if(n.require_protocol)return!1;n.allow_protocol_relative_urls&&"//"===r.substr(0,2)&&(f[0]=r.substr(2))}return r=f.join("://"),f=r.split("#"),r=f.shift(),f=r.split("?"),r=f.shift(),f=r.split("/"),r=f.shift(),f=r.split("@"),f.length>1&&(o=f.shift(),o.indexOf(":")>=0&&o.split(":").length>2)?!1:(a=f.join("@"),f=a.split(":"),u=f.shift(),f.length&&(l=f.join(":"),s=parseInt(l,10),!/^[0-9]+$/.test(l)||0>=s||s>65535)?!1:t.isIP(u)||t.isFQDN(u,n)||"localhost"===u?n.host_whitelist&&-1===n.host_whitelist.indexOf(u)?!1:n.host_blacklist&&-1!==n.host_blacklist.indexOf(u)?!1:!0:!1)},t.isIP=function(e,r){if(r=t.toString(r),!r)return t.isIP(e,4)||t.isIP(e,6);if("4"===r){if(!g.test(e))return!1;var n=e.split(".").sort(function(t,e){return t-e});return n[3]<=255}if("6"===r){var i=e.split(":"),o=!1,u=t.isIP(i[i.length-1],4),a=u?7:8;if(i.length>a)return!1;if("::"===e)return!0;"::"===e.substr(0,2)?(i.shift(),i.shift(),o=!0):"::"===e.substr(e.length-2)&&(i.pop(),i.pop(),o=!0);for(var s=0;s<i.length;++s)if(""===i[s]&&s>0&&s<i.length-1){if(o)return!1;o=!0}else if(u&&s==i.length-1);else if(!p.test(i[s]))return!1;return o?i.length>=1:i.length===a}return!1};var j={require_tld:!0,allow_underscores:!1,allow_trailing_dot:!1};t.isFQDN=function(t,r){r=e(r,j),r.allow_trailing_dot&&"."===t[t.length-1]&&(t=t.substring(0,t.length-1));var n=t.split(".");if(r.require_tld){var i=n.pop();if(!n.length||!/^([a-z\u00a1-\uffff]{2,}|xn[a-z0-9-]{2,})$/i.test(i))return!1}for(var 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n,i=e.replace(/[\s-]+/g,""),o=0;if("10"===r){if(!f.test(i))return!1;for(n=0;9>n;n++)o+=(n+1)*i.charAt(n);if(o+="X"===i.charAt(9)?100:10*i.charAt(9),o%11===0)return!!i}else if("13"===r){if(!c.test(i))return!1;var u=[1,3];for(n=0;12>n;n++)o+=u[n%2]*i.charAt(n);if(i.charAt(12)-(10-o%10)%10===0)return!!i}return!1},t.isMobilePhone=function(t,e){return e in O?O[e].test(t):!1};var B={symbol:"$",require_symbol:!1,allow_space_after_symbol:!1,symbol_after_digits:!1,allow_negatives:!0,parens_for_negatives:!1,negative_sign_before_digits:!1,negative_sign_after_digits:!1,allow_negative_sign_placeholder:!1,thousands_separator:",",decimal_separator:".",allow_space_after_digits:!1};t.isCurrency=function(t,n){return n=e(n,B),r(n).test(t)},t.isJSON=function(t){try{var e=JSON.parse(t);return!!e&&"object"==typeof e}catch(r){}return!1},t.isMultibyte=function(t){return D.test(t)},t.isAscii=function(t){return w.test(t)},t.isFullWidth=function(t){return b.test(t)},t.isHalfWidth=function(t){return y.test(t)},t.isVariableWidth=function(t){return b.test(t)&&y.test(t)},t.isSurrogatePair=function(t){return E.test(t)},t.isBase64=function(t){return S.test(t)},t.isMongoId=function(e){return t.isHexadecimal(e)&&24===e.length},t.isISO8601=function(t){return C.test(t)},t.ltrim=function(t,e){var r=e?new RegExp("^["+e+"]+","g"):/^\s+/g;return t.replace(r,"")},t.rtrim=function(t,e){var r=e?new RegExp("["+e+"]+$","g"):/\s+$/g;return t.replace(r,"")},t.trim=function(t,e){var r=e?new RegExp("^["+e+"]+|["+e+"]+$","g"):/^\s+|\s+$/g;return t.replace(r,"")},t.escape=function(t){return t.replace(/&/g,"&amp;").replace(/"/g,"&quot;").replace(/'/g,"&#x27;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/\//g,"&#x2F;").replace(/\`/g,"&#96;")},t.stripLow=function(e,r){var n=r?"\\x00-\\x09\\x0B\\x0C\\x0E-\\x1F\\x7F":"\\x00-\\x1F\\x7F";return t.blacklist(e,n)},t.whitelist=function(t,e){return t.replace(new RegExp("[^"+e+"]+","g"),"")},t.blacklist=function(t,e){return t.replace(new RegExp("["+e+"]+","g"),"")};var q={lowercase:!0};return t.normalizeEmail=function(r,n){if(n=e(n,q),!t.isEmail(r))return!1;var i=r.split("@",2);if(i[1]=i[1].toLowerCase(),"gmail.com"===i[1]||"googlemail.com"===i[1]){if(i[0]=i[0].toLowerCase().replace(/\./g,""),"+"===i[0][0])return!1;i[0]=i[0].split("+")[0],i[1]="gmail.com"}else n.lowercase&&(i[0]=i[0].toLowerCase());return i.join("@")},t.init(),t});
+!function(t,e){"undefined"!=typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&"object"==typeof define.amd?define(e):this[t]=e()}("validator",function(t){"use strict";function e(t){var e=t.match(C);if(!e)return(new Date).getTimezoneOffset();var r=e[21];if(!r||"z"===r||"Z"===r)return 0;var n,i,o=e[22];return-1!==r.indexOf(":")?(n=parseInt(e[23]),i=parseInt(e[24])):(n=0,i=parseInt(e[23])),(60*n+i)*("-"===o?1:-1)}function r(t,e){t=t||{};for(var r in e)"undefined"==typeof t[r]&&(t[r]=e[r]);return t}function n(t){var e="(\\"+t.symbol.replace(/\./g,"\\.")+")"+(t.require_symbol?"":"?"),r="-?",n="[1-9]\\d*",i="[1-9]\\d{0,2}(\\"+t.thousands_separator+"\\d{3})*",o=["0",n,i],u="("+o.join("|")+")?",a="(\\"+t.decimal_separator+"\\d{2})?",s=u+a;return t.allow_negatives&&!t.parens_for_negatives&&(t.negative_sign_after_digits?s+=r:t.negative_sign_before_digits&&(s=r+s)),t.allow_negative_sign_placeholder?s="( (?!\\-))?"+s:t.allow_space_after_symbol?s=" 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