These zones are: Marquises Is. (France): UTC -9.5 h Venezuela: UTC - 4.5 h Newfoundland I., Canada: UTC - 3.5 h Iran: UTC + 3.5 h Afganistan: UTC + 4.5 h India: UTC + 5.5 h Nepal: UTC + 5.75 h Myanmar: UTC + 6.5 h Cocos Is. (Australia): UTC + 6.5 h Central Australia: + 9.5 h Lord Howe I. (Australia): UTC + 10.5 h Norfolk I. (Australia): UTC +5 11.5 h Chatham Is. (New Zealand): UTC + 12.75 h Inclusion of these regions in the count would bring the total to 39 zones. For the ultimate of pedants it would be worth noting that, being a purely civil and legal construct, standard time is actually separate and distinct from jurisdiction to jurisdiction. That is to say, that while - for example - standard time is the same in Totonto as it is New York, the underlying legislation is not the same. It is not 12pm in Totonto because it is 12pm in New York, it is 12 pm in Totonto because the Ontarian provincial government says it is 12pm and it is 12 pm in New York because the New York State Assembly has decreed it to be so. So, strictly speaking, you are dealing with two legally distinct and separate standard time zones. Extend that principle to the entire world, and also take into account that many regions have two time systems (standard and 'daylight saving' or 'summer' time) and the number of distinct standard time zones will be well into 3 figures. There are 24 standard time zones in the world. There's a few non standard zones, too. Time zones are divided into 15 degree (longitude) segments, so 360 degrees divided by 15 equals 24 time zones. Your question said "standard," so we are not looking at the myriad locally adjusted time zones that exist around the world. There are 26 standard time zones in the world.