timezone

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Recap : library : datetime, pytz

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# Introduction to Timezones

# Actually, Use putz instead

# Timezonapalooza

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: So when we create a date time or time object, we can specify the time zone. 

: And now, that object knows where it is in the world and how to sort itself out amongst all of our other objects. 

: We say that a date time object that knows its time zone, is aware, and  those that don't are naive. 

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import datetime

pacific = datetime.timezone(datetime.timedelta(hours=-8))

eastern = datetime.timezone(datetime.timedelta(hours=-5))

naive = datetime.datetime(2014, 4, 21, 9)

aware = datetime.datetime(2014, 4, 21, 9, tzinfo=pacific)

# now, let's change the timezone.. ( what's that mean? a ha ! travel to the another world synchronously )

# Tool : astimezone

# Q : as + timezone/.. "as" ?

aware.astimezone(eastern)

# later pytz library ( hours=-8, hours=-5 is headache. )

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 The Problem with Time & Timezones

Strangest Timezones of the World

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naive is a datetime with no timezone.

Create a new timezone for US/Pacific, which is 8 hours behind UTC (UTC-08:00).

Then make a new variable named hill_valley that is naive with its tzinfo attributereplaced with the US/Pacific timezone you made. 

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import datetime

naive = datetime.datetime(2015, 10, 21, 4, 29)

us_pacific = datetime.timezone(datetime.timedelta(hours=-8))

hill_valley = naive.replace(tzinfo=us_pacific)

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Great, but replace just sets the timezone, it doesn't move the datetime to the new timezone. Let's move one.

Make a new timezone that is UTC+01:00.

Create a new variable named paris that uses your new timezone and the astimezonemethod to change hill_valley to the new timezone.

 " Think very important. ..