CET vs GMT: Exact Time Difference & Quick Conversion Guide
CET is Central European Time (UTC+1). GMT is Greenwich Mean Time (UTC+0). The exact difference is one hour: when it is 12:00 GMT, it is 13:00 CET.
Travelers and remote teams often confuse them because both labels appear in airline schedules and meeting invites, yet one shifts with daylight-saving while the other stays fixed, so a quick mental check saves missed flights and awkward “sorry, wrong time” Slack messages.
Key Differences
CET follows daylight-saving, leaping to UTC+2 in summer. GMT never changes, remaining UTC+0 year-round. Apps and smartwatches auto-update CET twice a year, but GMT stays rock-solid, making it the go-to reference for global finance and astronomy.
Which One Should You Choose?
If you live or work in Europe, set clocks to CET. For international coordination—shipping, crypto trading, or flight tracking—use GMT as your baseline and convert locally.
Examples and Daily Life
A 16:00 GMT webinar equals 17:00 CET in winter, 18:00 in summer. Booking a 09:00 GMT flight out of Frankfurt? Be at the gate by 10:00 CET in January or 11:00 in July.
Does CET ever match GMT?
Yes, during the single week when Europe has already left daylight time but Britain hasn’t yet switched back.
How do I convert quickly without an app?
Add one hour to GMT for CET in winter; add two hours when daylight-saving is active.