Datetime Now Python Utc

  1. Python Datetime Utcnow Format
  2. Python Datetime Now Utc Iso
  3. Datetime Now Python Utc Time
Python
  1. Use the pytz module, which comes with a full list of time zones + UTC. Figure out what the local timezone is, construct a timezone object from it, and manipulate and attach it to the naive datetime. Finally, use datetime.astimezone method to convert the datetime to UTC.
  2. Get Current Date and Time. Import datetime datetimeobject = datetime.datetime.now.
  3. Warning: datetime also provides datetime.utcnow , which returns an instance of datetime at the current UTC. However, the Python documentation recommends against using this method because it doesn’t include any time zone information in the resulting instance.

Python DateTime now Function datetime.datetime.now function returns datetime object containing current date and time of the system during the execution of now statement. In this tutorial, we will learn the syntax of datetime now function and use it in some example Python programs to understand its usage. Syntax – datetime.now.

Question or problem about Python programming:

I have a python datetime instance that was created using datetime.utcnow() and persisted in database.

Datetime Now Python Utc

For display, I would like to convert the datetime instance retrieved from the database to local datetime using the default local timezone (i.e., as if the datetime was created using datetime.now()).

How can I convert the UTC datetime to a local datetime using only python standard library (e.g., no pytz dependency)?

It seems one solution would be to use datetime.astimezone( tz ), but how would you get the default local timezone?

How to solve the problem:

Solution 1:

Python

In Python 3.3+:

In Python 2/3:

Using pytz (both Python 2/3):

Example
Output

Python 3.3

Python 2

pytz

Note: it takes into account DST and the recent change of utc offset for MSK timezone.

I don’t know whether non-pytz solutions work on Windows.

Solution 2:

You can’t do it with only the standard library as the standard library doesn’t have any timezones. You need pytz or dateutil.

Or well, you can do it without pytz or dateutil by implementing your own timezones. But that would be silly.

Python Datetime Utcnow Format

Solution 3:

You can’t do it with standard library. Using pytz module you can convert any naive/aware datetime object to any other time zone. Lets see some examples using Python 3.


Naive objects created through class method utcnow()

To convert a naive object to any other time zone, first you have to convert it into aware datetime object. You can use the replace method for converting a naive datetime object to an aware datetime object. Then to convert an aware datetime object to any other timezone you can use astimezone method.

The variable pytz.all_timezones gives you the list of all available time zones in pytz module.

Python Datetime Now Utc Iso


Naive objects created through class method now()

Because now method returns current date and time, so you have to make the datetime object timezone aware first. The localize function converts a naive datetime object into a timezone-aware datetime object. Then you can use the astimezone method to convert it into another timezone.

Solution 4:

Datetime Now Python Utc Time

Building on Alexei’s comment. This should work for DST too.

Solution 5:

I think I figured it out: computes number of seconds since epoch, then converts to a local timzeone using time.localtime, and then converts the time struct back into a datetime…

It applies the summer/winter DST correctly:

Hope this helps!