In an international organisation, I find it a best practice to express timestamps using explicit day of week, unambiguous date (either YYYY-MM-DD or writing out the name of the month), and times in both UTC and local time, with the two time zones expressed explicitly, and possibly both using a common name and a time zone offset from UTC.

For example, right now it is Monday, 10 February 2020, and the time is 16:20 UTC or18:20 EET (UTC+2).

It's a bit repetitive, but that helps notice mistakes.

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