why does $visitdate = date(d/m/Y h:i:s A O); results in an unexpected T_STRING error?

Try this:

Code:

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$visitdate = date('d/m/Y h:i:s A O');

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You need to pass in a string as the date functions parameter, so add some quotes around what you are passing in to make it a string.

For more on this function please refer to PHP: date - Manual