Customisable calendars supporting different languages, sizes (normal, "giant", "giantlandscape" and "small"), colours and illustrations. The calendars can be marked with events with date ranges, with different markers and styles.
The default-sized calendars print 2-up on A4-sized papers and should fit CD jewel cases.
The "small" calendars print 4-up on A4-sized papers and should fit 3.5" floppy disk cases.
The "giant" calendars are full-page A4-sized.
Colours, illustrations, fonts etc are customisable.
Use the sundayweek document class option to make weeks start on Sundays.
Localisation possible with languages supported by babel/translator/datetime2.
This is an example of such a customisation for Japanese, to be compiled with (up)LaTeX. The original templates will work with language options supported by datetime2 and babel. Use the nobabel option and make your own customisations, for languages not supported by babel and/or translator.
Or fork it on Github!