In two previous sections, we worked with dates and times, without taking into account the timezone. While planning the meeting with foreigners, planning to fly to another country, or planning to watch some sporting event, you have to take this into account.

We might mention about tzinfo argument of the datetime object. But to handle timezones, we will use pytz library, which brings the tz database (also known as Olson database) in Python. At this time we will not use from library import something since there is no need in loading specific methods for pytz.

Let's start with the exploration of available timezones. There are two methods available in pytz: .all_timezones will return a list with all the available timezones in pytz, and .common_timezones will return only the common ones.