In UIs prefer date/time pickers instead of raw text inputs which will give the date/time in standard ISO format such as ("2025-07-25" or "2025-07-25T18:47:26.022Z"). Prefer ISO formats everywhere where possible.

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somat 4 days ago | parent [-]

The thing that bothers me about the firefox date picker is it display the date in YYYY/DD/MM format.

While I am fairly sure this a a locale defined thing. locales are this huge pile of worms and I have never figured out how to change it to show YYYY-MM-DD format

	▲	senfiaj 4 days ago \| parent [-]
		At least the real input value is in YYYY-MM-DD. Also the date picker will show the day in it's calendar UI.