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/usr/share/pennmush/game/getdate.README is in pennmush-common 1.8.2p8-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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The getdate.template file is used by the extended CONVTIME() (See
@config compile for it's status) to match many date and time
templates.

The format is one template per line, using the same codes as
TIMEFMT(), except with %-signs instead of $-signs. Plain text is
matched exactly. The MUSH does not need to be rebooted after editing
getdaily.template.

DO NOT use '%c', '%x' or '%X', as they might crash the mush on a linux
box, and possibly others.

For more details on the format of the file, see your system
documentation on the getdate() and strptime() C functions.