Created
May 30, 2014 18:47
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setDate vs setUTCDate
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| d = new Date('Fri May 30 2014 00:00:00 GMT+0100 (BST)'); | |
| // >> Fri May 30 2014 00:00:00 GMT+0100 (BST) | |
| d.setUTCDate(31); | |
| // >> 1401577200000 | |
| d | |
| // >> Sun Jun 01 2014 00:00:00 GMT+0100 (BST) | |
| d = new Date('Fri May 30 2014 00:00:00 GMT+0100 (BST)'); | |
| // >> Fri May 30 2014 00:00:00 GMT+0100 (BST) | |
| d.setDate(31); | |
| // >> 1401490800000 | |
| d | |
| // >> Sat May 31 2014 00:00:00 GMT+0100 (BST) |
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Using the setUTCDate method to set the day to the 31st only results in the date changing to the 1st of June if the GMT offset is a high enough positive value to push the clock forward past midnight into the next day. It's easy to get caught out by the nuances of setUTCDate!