Date calculation fails on win32 machines

[bitwolfe]

Date calculation fails on windows because strftime("%u") is unsupported.

For example getEventCalendarDateRange() fails to calculate $startDOW and returns false.

Something like the below would work to be cross-platform. But I honestly haven't done enough testing to tell if that's a good solution, especially on unix. Seems weird to give a numeric value to strftime() though :/

$startDOW = strftime((($w = date("w", $mStartDate)) ? $w + 1 : 7), strtotime($mStartDate));

Seems to output the right date range on Windows however. (Well, with Monday as the first day of the week)