man calendar says its month/day... http://www-sbras.nsc.ru/cgi-bin/www/unix_help/man-cgi?calend... oh, you mean the adventure took place over more than one calendar year, and so without the years, the high bit of the ordering is lost, and the dates wrap around.
About the format it says "Other lines should begin with a month and day. They may be entered in almost any format, either numeric or as character strings." So "month/day" isn't a requirement.
And there's no reason the dates can't be placed in their true order--calendar.ubuntu is ordered by version number and calendar.debian has multiple groups of dates ordered by year.
And there's no reason the dates can't be placed in their true order--calendar.ubuntu is ordered by version number and calendar.debian has multiple groups of dates ordered by year.