Since you're generating the same output as the 'date' command provides, you could just do it right from the command line:
$ date; ./myscript; date
You could also create a macro in whatever editor you're using that would let you stick something like this at the top of your scripts:
sub x{print localtime()."\n"};BEGIN{x};END{x}
Not that I'm not actually recommending this as a *good* solution; I suspect you're having an XY Problem, with the concomitant incorrect approach. But since that's not the question you asked...
--
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