strtotime PHP function questions

I have a strtotime function that is doing something like this:

$var = strtotime('23:59:59' . $Date);

Where $Date is a date in this form开发者_如何学Pythonat: MM/DD/YY

However, this randomly fails and returns nothing from it.... am I doing something wrong here?

Thanks.

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You should add a space character to the end of your time string

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It's not necessarily always the best way to accomplish date math, but note the very handy feature that strtotime() takes interval words too:

$var = strtotime($date . ' +1 day -1 second');

I.e., start at $date, add one day, then subtract one second. This gives you 23:59:59 for $date.