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Wherever you can enter or modify a date, there's a calendar icon with a link, but nothing was happening if I clicked it. I found out this was because of lines 268 to 280 in session.php, the first and last of which are:
$monthtonum["tsh"] = 1;
$monthtonum["ell"] = 13;
Since these don't seem to be in use anywhere, I nulled out these lines with "\\". Now, I get the proper calendar popup. Perhaps these lines are unused, or for an upcoming feature?