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echo date("W",strtotime('2010-01-01'));
This outputs 53. I would expect it to output 1. Can anyone else confirm this behavior, or maybe explain why? I couldn’t find a bug report on it.
This isn’t a bug at all, it’s expected behaviour. From PHP’s Date Page:
Jan 1, 2010, fell on a Friday, so its week number would belong to 2009, making it part of the 53rd week of 2009. Jan 4, 2010 would be week 1.