What CETTime.now covers
Central European Time: CET vs CEST, countries on it, converters, EU clock-change rules.
How the time data is calculated
Live clocks and offsets use the IANA time zone database. Place names and geographic relationships use GeoNames data. Daylight-saving transitions are calculated from the rules available to the application rather than copied from a static clock.
Editorial approach
Guides are organized around the purpose of this domain, checked against the underlying time-zone data, and updated when rules or scheduled dates change. The site does not claim atomic-clock precision: the displayed time also depends on the clock and connection of the device viewing it.