Compare city times

Compare two to four cities using IANA timezones. Enter a custom date and time in the first city to convert that instant everywhere else.

Leave blank to use the current time.

Cardiff — 5:50 PM (17:50) on Sunday, 25 October 2026 · GMT · UTC+00:00 · evening

London — 5:50 PM (17:50) on Sunday, 25 October 2026 · GMT · UTC+00:00 · evening
London is currently in the same offset as Cardiff.

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24-hour comparison

Each row is that city’s own local day. Colours mark working hours (09:00–17:00), evening, and night. The current local hour is outlined.

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Cardiff
London

Best meeting time (09:00–17:00)

  • Cardiff 09:00 — Cardiff 9:00 AM; London 9:00 AM
  • Cardiff 10:00 — Cardiff 10:00 AM; London 10:00 AM
  • Cardiff 11:00 — Cardiff 11:00 AM; London 11:00 AM
  • Cardiff 12:00 — Cardiff 12:00 PM; London 12:00 PM
  • Cardiff 13:00 — Cardiff 1:00 PM; London 1:00 PM
  • Cardiff 14:00 — Cardiff 2:00 PM; London 2:00 PM
  • Cardiff 15:00 — Cardiff 3:00 PM; London 3:00 PM
  • Cardiff 16:00 — Cardiff 4:00 PM; London 4:00 PM

Try Compare London and New York time or Compare Sydney and London time.

Related links

Frequently asked questions

Each city is converted with DateTimeZone for the same instant. The difference is the gap between those offsets on that date, including daylight saving.

The helper looks for hours when every selected city is between 09:00 and 17:00 local time. If no hour overlaps, it reports that no shared working hour exists that day.