Javascript date parsing on Iphone

问题:

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 (a member of JSON object). I'm using

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

This works on Android devices, however on IPhone it just gives an invalid date.

How do I need to format my date string so it can be parsed by the IPhone?

回答1:

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.

回答2:

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.

回答3:

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)

回答4:

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