dateutil - powerful extensions to datetime 
The dateutil module provides powerful extensions to
the standard datetime module, available in Python. 
Installation
dateutil can be installed from PyPI using pip (note that the package name is
different from the importable name):
pip install python-dateutil 
Download
dateutil is available on PyPI
https:/pypi.org/project/python-dateutil/
The documentation is hosted at:
https:/dateutil.readthedocs.io/en/stable/ 
Code
The code and issue tracker are hosted on GitHub:
https:/github.com/dateutil/dateutil/ 
Features 
Computing of relative deltas (next month, next year,
next Monday, last week of month, etc);
Computing of relative deltas between two given
date and/or datetime objects;
Computing of dates based on very flexible recurrence rules,
using a superset of the iCalendar
specification. Parsing of RFC strings is supported as well.
Generic parsing of dates in almost any string format;
Timezone (tzinfo) implementations for tzfile(5) fo 
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