Daylight Saving Time (DST) rules
Vatican City is in the Central European Time Zone . Central European Standard Time ( CET ) is 1 hours ahead of Greenwich Mean Time ( GMT+1 ).
Like most states in Europe, Summer (Daylight-Saving) Time is observed in Vatican City, where the time is shifted forward by 1 hour; 2 hours ahead of Greenwich Mean Time ( GMT+2 ).
After the Summer months the time in Vatican City is shifted back by 1 hour to Central European Time (CET) or ( GMT+1 )
Vatican City Official website