Why not the same as calendar days?

DST and offsets can shift elapsed hours even if dates look similar.

Time Difference

Q: Does it account for DST?

Yes, the calculation uses exact instants, handling DST jumps.

Q: Can start and end use different zones?

Yes, each input supports its own time zone.

Compute the exact duration between two dates/times in an IANA timezone — DST-aware.

Start (local) End (local) Timezone (IANA) Examples: Europe/Warsaw, America/New_York

Timezone

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Total seconds

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Humanized

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Start (local w/ offset) End (local w/ offset) Start offset End offset Start DST End DST Start (UTC) End (UTC) Start Unix (s) Start Unix (ms) End Unix (s) End Unix (ms) Days Hours Minutes Seconds

FAQ

Does it account for DST?
Yes. Durations are computed on actual instants, so DST jumps are handled correctly.

Can start and end use different zones?
Yes. Each side can have its own time zone.

Small discrepancies vs. calendar days?
Calendar day counts can differ from exact elapsed hours during DST changes; we show exact durations.