I believe they only have one the Eastern European Time Zone.
They are on completely different parts of the world. When it is daytime in Greece it is night in the US, so they have to have different times and so they are in different time zones.
mongolia have 4 different time zones
There is only one time zone throughout Greece, the Eastern European Time Zone (EET+2). Greece also observes daylight savings time.
Zimbabwe has 4 different time zones because it's a small country.
Austria uses Central European Time.
There are 24 different time zones around the world.
none
There is a 6 hour time difference. It is actually 7 time zones different, as some time zones are not 1 hour.
At any given time, the clocks around the world are set to at least 38 different times, and these time zones have about 165 different names, including about 130 different names just for Standard Time designations.
Only 1
one: Greenwich Mean Time
Russia has 9 different time zones, 8 contiguous and another one in Kaliningrad.