Python Datetime Gmt

TL;DR: You should always store datetimes in UTC and convert to proper timezone on display.

A timezone offset refers to how many hours the timezone is from Coordinated Universal Time (UTC). The offset of UTC is +00:00, and the offset of Asia/Taipei timezone is UTC+08:00 (you could also present it as GMT+08:00). Basically, there is no perceptible difference between Greenwich Mean Time (GMT) and UTC.

The local time subtracts the offset of its timezone is UTC time. For instance, 18:00+08:00 of Asia/Taipei minuses timezone offset +08:00 is 10:00+00:00, 10 o'clock of UTC. On the other hand, UTC time pluses local timezone offset is local time.

Python DateTime to Unix timestamp 13 digits. Now, we can see DateTime to Unix timestamp 13 digits in python. In this example, I have imported modules like time and datetime.; The datetime.datetime.now is used to get the present time. Get Current Date and Time. Import datetime datetimeobject = datetime.datetime.now.

ref:
https://opensource.com/article/17/5/understanding-datetime-python-primer
https://julien.danjou.info/blog/2015/python-and-timezones

A date in Python is not a data type of its own, but we can import a module named datetime to work with dates as date objects. DateTime objects also provide access to their value in a float format usable with the python time module, provided that the value of the object falls in the range of the epoch-based time module.

到底是 GMT+8 還是 UTC+8?
http://pansci.asia/archives/84978

Installation

Show System Timezone

ref:
https://github.com/regebro/tzlocal
https://stackoverflow.com/questions/13218506/how-to-get-system-timezone-setting-and-pass-it-to-pytz-timezone/

Utc

Find Timezones Of A Certain Country

ref:
https://pythonhosted.org/pytz/#country-information

Offset-naive Datetime

Any naive datetime would be present as local timezone but without tzinfo, so it is buggy.

A naive datetime object contains no timezone information. The datetime_obj.tzinfo will be set to None if the object is naive. Actually, datetime objects without timezone should be considered as a 'bug' in your application. It is up for the programmer to keep track of which timezone users are working in.

ref:
https://docs.python.org/3/library/datetime.html
https://dateutil.readthedocs.io/en/stable/

Offset-aware Datetime

Python Datetime Gmt To Utc

A aware datetime object embeds a timezone information. Rules of thumb for timezone in Python:

  • Always work with 'offset-aware' datetime objects.
  • Always store datetime in UTC and do timezone conversion only when interacting with users.
  • Always use ISO 8601 as input and output string format.

There are two useful methods: pytz.utc.localize(naive_dt) for converting naive datetime to timezone be offset-aware, and aware_dt.astimezone(pytz.timezone('Asia/Taipei')) for adjusting timezones of offset-aware objects.

You should avoid naive_dt.astimezone(some_tzinfo) which would be converted to aware datetime as system timezone then convert to some_tzinfo timezone.

For working with pytz, it is recommended to call tz.localize(naive_dt) instead of naive_dt.replace(tzinfo=tz). dt.replace(tzinfo=tz) does not handle daylight savings time correctly.

ref:
https://pythonhosted.org/pytz/

Python Get Gmt Time

Naive and aware datetime objects are not comparable.

Parse String to Datetime

python-dateutil usually comes in handy.

ref:
https://dateutil.readthedocs.io/en/stable/

Convert Datetime To Unix Timestamp

Parse Unix Timestamp To Datetime

ref:
https://stackoverflow.com/questions/13890935/does-pythons-time-time-return-the-local-or-utc-timestamp

We might receive an Unix timestamp from a JavaScript client.

ref:
https://momentjs.com/docs/#/parsing/unix-timestamp/

Scala ide sbt. The path from SBT to Scala-IDE is well described in many places: Start with an SBT project; Add the SBT plugin definition: addSbtPlugin('com.typesafe.sbteclipse'% 'sbteclipse-plugin'% '2.1.0-RC1') Run the 'eclipse' command from within SBT; Open Eclipse with an installed Scala-IDE add-on; Import the project; What is the reverse for this? Build.sbt is a Scala-based DSL to express parallel processing task graph. Typos in build.sbt will be caught as a compilation error.

Store Datetime In Databases

  • MySQL lets developers decide what timezone should be used, and you should convert datetime to UTC before saving into database.
  • MongoDB assumes that all the timestamp are in UTC, and you have to normalize datetime to UTC.
Python

ref:
https://tommikaikkonen.github.io/timezones/
https://blog.elsdoerfer.name/2008/03/03/fun-with-timezones-in-django-mysql/

Python

Tools

ref:
https://www.epochconverter.com/
https://www.timeanddate.com/worldclock/converter.html

The following code snippet illustrates use of pytz and datetime to display current date and time in various MST, EST, UTC, GMT and HST

Datetime Python Utc

Sample output of above program.
C:programstime>pep8 --first example6.py
C:programstime>python example6.py
Time in MST: 2017-01-19 06:06:14.495605-07:00
Time in EST: 2017-01-19 08:06:14.496606-05:00
Time in UTC: 2017-01-19 13:06:14.496606+00:00
Time in GMT: 2017-01-19 13:06:14.496606+00:00
Time in HST: 2017-01-19 03:06:14.497606-10:00
C:programstime>

Python Datetime Gmt+8

2018-03-23T09:30:00+05:302018-03-23T09:30:00+05:30Amit AroraAmit AroraPython Programming TutorialPythonPractical Solution