In Greece, the standard time is Eastern European Time (Greek: ÃÂÃÂñ ÃÂýñÃÂÿûùúîàÃÂàÃÂÃÂÃÂ÷ÃÂ; EET; ). Daylight saving time, which moves one hour ahead to is observed from the last Sunday in March to the last Sunday in October. Greece adopted EET in 1916; before that, Athens mean time (1 hour, 34 minutes, and 52 seconds ahead of GMT) was observed.
The 12-hour notation is used in verbal communication, but the 24-hour format is also used along with the 12-hour notation in writing. The minutes are usually written with two digits; the hour numbers are written with or without a leading zero.
In the IANA time zone database, Greece is given the zone Europe/Athens.