Here's an interesting date format most of HN probably haven't heard of; military date-time-groups[1]. 270009LFEB21 Translation: The 27th, 00:09, "L" timezon

Here's an interesting date format most of HN probably haven't heard of; military date-time-groups[1]. 270009LFEB21 Translation: The 27th, 00:09, "L" timezone (+11, NATO timezone[2]), February, 2021. Advantages: - it's much more compact than ISO8601. - the most significant information is first; the date. - the second-most significant information is second; the time. - the timezone is a single alphanumeric character. - when military paperwork has a box at the top that says "DTG", everyone knows the format. - I'm pretty sure it's a standard across all NATO militaries. [1] https://en.wikipedia.org/wiki/Date-time_group#Military_Date_Time_Group https://en.wikipedia.org/wiki/Date-time_group#Military_Date_... [2] https://en.wikipedia.org/wiki/List_of_military_time_zones https://en.wikipedia.org/wiki/List_of_military_time_zones