Javascript date parsing on Iphone

Question

I\'m working on an offline capabable Javascript site that targets mobile devices. One such mobile device is the IPhone.

I\'m trying to parse a date from our REST API

Answer 1

Update 2019-07-29: Not removing existing content below, but I highly suggest you don't use this method. I learned from my mistakes. Do not override JavaScript's existing methods. Becomes bad for your code's portability and performance. If you can't get ISO 8601 (which is standard practice in JS and most API's) - then change that system instead. Alternatively, write your own function, which always has to be called to generate a Date object.

---

If you can correct your REST API to send down proper ISO 8601 date times, the proper way to handle this is to use a regex shim that allows all browsers to process ISO 8601 dates. Sure it might be slower, but handling dates with Javascript is like trying to get a cat into a tub of water.

Keep in mind the following method overrides the original Date.parse method. This could be problematic in larger projects or with many developers with different expectations. Use only if you're aware of what you're doing.

/**
 * Date.parse with progressive enhancement for ISO 8601 <https://github.com/csnover/js-iso8601>
 * © 2011 Colin Snover <http://zetafleet.com>
 * Released under MIT license.
 */
(function (Date, undefined) {
    var origParse = Date.parse, numericKeys = [ 1, 4, 5, 6, 7, 10, 11 ];
    Date.parse = function (date) {
        var timestamp, struct, minutesOffset = 0;

        // ES5 §15.9.4.2 states that the string should attempt to be parsed as a Date Time String Format string
        // before falling back to any implementation-specific date parsing, so that’s what we do, even if native
        // implementations could be faster
        //              1 YYYY                2 MM       3 DD           4 HH    5 mm       6 ss        7 msec        8 Z 9 ±    10 tzHH    11 tzmm
        if ((struct = /^(\d{4}|[+\-]\d{6})(?:-(\d{2})(?:-(\d{2}))?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(\d{2})(?::(\d{2}))?)?)?$/.exec(date))) {
            // avoid NaN timestamps caused by “undefined” values being passed to Date.UTC
            for (var i = 0, k; (k = numericKeys[i]); ++i) {
                struct[k] = +struct[k] || 0;
            }

            // allow undefined days and months
            struct[2] = (+struct[2] || 1) - 1;
            struct[3] = +struct[3] || 1;

            if (struct[8] !== 'Z' && struct[9] !== undefined) {
                minutesOffset = struct[10] * 60 + struct[11];

                if (struct[9] === '+') {
                    minutesOffset = 0 - minutesOffset;
                }
            }

            timestamp = Date.UTC(struct[1], struct[2], struct[3], struct[4], struct[5] + minutesOffset, struct[6], struct[7]);
        }
        else {
            timestamp = origParse ? origParse(date) : NaN;
        }

        return timestamp;
    };
}(Date));

https://github.com/csnover/js-iso8601

Answer 2

You might have better luck if you stick to ISO 8601 format:

Date.parse("2010-03-15T10:30:00");

// e.g.
var d = new Date( Date.parse("2010-03-15T10:30:00") );
console.log( d.toString() ); //Mon Mar 15 2010 10:30:00 GMT+0000 (BST)

Answer 3

For UTC/GMT time, you can try:

    var arr = "2014-10-27T16:05:44+0000".split(/[\-\+ :T]/);

    var date = new Date();
    date.setUTCFullYear(arr[0]);
    date.setUTCMonth(arr[1] - 1);
    date.setUTCDate(arr[2]);
    date.setUTCHours(arr[3]);
    date.setUTCMinutes(arr[4]);
    date.setUTCSeconds(arr[5]);

The date object will display in the proper local timezone when used.

Answer 4

Wrapping Up with the string will do the magic. Since the safari has some unique way of parsing and formatting date

Date.parse(String("2010-03-15 10:30:00"));

Still facing issue use the Moment.js

Happy to help. :-)

Answer 5

Not all browsers support the same date formats. The best approach is to split the string on the separator characters (-,   and :) instead, and pass each of the resulting array items to the Date constructor:

var arr = "2010-03-15 10:30:00".split(/[- :]/),
    date = new Date(arr[0], arr[1]-1, arr[2], arr[3], arr[4], arr[5]);

console.log(date);
//-> Mon Mar 15 2010 10:30:00 GMT+0000 (GMT Standard Time)

This will work the same in all browsers.