When is it where they are?
Pick a moment and share the link. Whoever opens it sees that exact instant in their own time zone — no maths, no "is that your 3pm or mine".
The link carries the exact instant and your time zone. It works without an account.
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The .ics file also imports into Apple Calendar and Outlook.
"Tuesday 15:00 CET" breaks in three ways: half the readers do not know what CET is, it is wrong half the year because the zone switches to CEST, and anyone converting it by hand can be an hour out. A link carries the instant itself, not a label for it.
Under the hood the link stores the exact moment in UTC plus the time zone you chose, as an IANA name like Europe/Warsaw — not an abbreviation. That is what makes it survive daylight saving changes on both ends.
- Does the recipient need an account?
- No. The link holds everything it needs, so it opens for anyone, anywhere, with no sign-up and nothing stored on our side.
- What if we are in different countries?
- That is the point. Everyone sees the same instant written in their own local time, with the day of the week, so nobody is a day out either.
- Why not just write "15:00 CET"?
- Because CET is only correct for part of the year — the same zone is CEST in summer — and abbreviations are ambiguous worldwide. CST alone means three different things.
- Will it still be right after the clocks change?
- Yes. The moment is fixed in UTC, so both your time and the recipient's are recalculated correctly whenever either side switches.