European here. When I state my date of birth I state it as “7th of October 1990”. When a date is within the current year I state it as for example “27th of Jun

European here. When I state my date of birth I state it as “7th of October 1990”. When a date is within the current year I state it as for example “27th of June”. If weekday matters, and specific date is still relevant I’ll say for example “Monday 27th of June”. I might also simply say “Sunday last week”, “Monday next week”, “Monday at the end of next month”, etc. Likewise I might say “a couple of weeks ago”, “last week”, “a few days ago”, “in under two weeks”, etc. Depends on context. When including a date in a file name I prefer YYYY-MM-DD for date. When using dates in a directory hierarchy I’ll have years on the top level, with months within them and dates within those. Sometimes I might use a format like YYYY-mm-ddTHHMMz_s in a file name. For example “something_2022-06-20T1722+0000_1655745728_more_text.tbz”