After yet another unpleasant experience starting up GPG on a new system, I
decided to encode my learnings and mistakes as aliases, functions, scripts,
hoping to protect my future me from myself. Fingers crossed!
This format string is being used in my i3 config and in my alias for
creating a gPaste. I figured it'd be nice to set a variable that defines
the format. Future me: run `man date` to see what format options are
supported.