PHP calculating number of days between 2 dates

Question

I am developing a web application which revolves around dates.

I need to calculate numbers based around days elasped, for example - pseudo code

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Answer 1

You can simplify this considerably by calculating how many complete weeks fall between the two specified dates, then do some math for the beginning/end partial weeks to account for dangling dates.

e.g.

$start_date = 1298572294;  // Tuesday
$finish_date = 1314210695; // Wednesday

$diff = 1314210695-1298572294 = 15638401 -> ~181 days -> 25.8 weeks -> 25 full weeks.

Then it's just a simple matter of checking for the dangling dates:

Tuesday -> add 2 days for Wednesday+Friday to get to the end of the week
Wednesday -> add 1 day for Monday to get to the beginning on the week

Total countable days = (25 * 3) + 2 + 1 = 75 + 3 = 78 countable days