It looks like you can display the current date and time. You just need to subtract 24 hours from now to get to yesterday. 
localtime( time() - (24 * 60 * 60) );

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Combine that with strftime() and youre done.

EDIT (after comment below): Make sure your timezone is set correctly too.

In reply to Re: Date function by cursion
in thread Date function by Anonymous Monk

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