The short CW contests that run every week: the CWops CWT four times a week, the K1USN Slow Speed Test, the ICWC Medium Speed Test and the NCCC Sprint.
Their times are fixed in UTC and do not follow daylight saving time, so they move by an hour in local time twice a year. This calendar shows every session in your own time zone.
In Amateur Radio. Perfect Clock — a world clock with your calendar across time zones.