There is no overlap between 09:00–18:00 working days in these two places.
How many hours is CET behind ChST?
As abbreviations, ChST is always 9 hours ahead of CET: CET is UTC+1 and ChST is UTC+10. To convert, add 9 hours.
When the CET to ChST time difference changes
For most of the year ChST is 8 hours ahead of CET. From 25 October to 31 December 2026, ChST is 9 hours ahead of CET instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
ChST vs CET
Length
25 October 2026 to 31 December 2026
9 hours ahead
68 days
1 January 2027 to 27 March 2027
9 hours ahead
86 days
28 March 2027 to 30 October 2027
8 hours ahead
217 days
31 October 2027 to 31 December 2027
9 hours ahead
62 days
Best time for a meeting between CET and ChST
When ChST is 8 hours ahead of CET: no shared 09:00 to 17:00 hours; try 09:00 in CET (17:00 in ChST).
When ChST is 9 hours ahead of CET: no shared 09:00 to 17:00 hours; try 08:00 in CET (17:00 in ChST).
Frequently asked questions about CET and ChST time
How many hours ahead is ChST of CET?
ChST (UTC+10) is 9 hours ahead of CET (UTC+1).
Does the time difference between CET and ChST change?
Yes. It is usually 8 hours ahead, but changes when one side moves its clocks: 9 hours ahead from 25 October to 31 December 2026; 9 hours ahead from 1 January to 27 March 2027.