Central EuropeanStandard Time = GMT+1 Central EuropeanSummer Time = GMT+2
DAYLIGHT SAVING TIME
UK and Europe Clock Change Rules
Tonsberg Time 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 Tonsberg Time, 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 Tonsberg Time is shifted back by 1 hour to Central European Time (CET) or ( GMT+1 )