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Editorial Team
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Asked: 2026-06-19T01:34:48+00:00

What’s going on here: > new Date(‘Apr 15 2013’); Mon Apr 15 2013 00:00:00

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What’s going on here:

> new Date('Apr 15 2013');
Mon Apr 15 2013 00:00:00 GMT+0100 (GMT Daylight Time)
> new Date('04/15/2013');
Mon Apr 15 2013 00:00:00 GMT+0100 (GMT Daylight Time)
> new Date('2013-04-15');
Mon Apr 15 2013 01:00:00 GMT+0100 (GMT Daylight Time)

Obviously, one is being interpreted as UTC time, while the other two are being interpreted as local time. What causes the difference in parsing?

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1 Answer

  1. Editorial Team

    From the specification:

    The String may be interpreted as a local time, a UTC time, or a time in some other time zone, depending on the contents of the String. The function first attempts to parse the format of the String according to the rules called out in Date Time String Format (15.9.1.15). If the String does not conform to that format the function may fall back to any implementation-specific heuristics or implementation-specific date formats.

    Of all the formats you provided, only '2013-04-15' is officially supported, so the others seem to fall back to implementation-dependent behavior.

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