Why does the following JS date string fail? It's passed from a JS Date object to a Python backend.
2021-12-31T05:00:00.000Z
mydate = datetime.fromisoformat(form['expirationDate'])
Error:
ValueError: Invalid isoformat string: '2021-12-31T05:00:00.000Z'
As per documentation, date.fromisoformat() only supports the YYYY-MM-DD format .
I believe the easiest way to solve the problem would be to use dateutil.parser.isoparse().
For example:
import dateutil.parser
mydate = dateutil.parser.isoparse('2021-12-31T05:00:00.000Z')
print(mydate)
will correctly print 2021-12-31 05:00:00+00:00
If you are bound to using datetime, take a look at strptime and/or this question
EDIT: my bad, I confused datetime with date, sooo.. as others pointed out you could remove the trailing Z and call it a day
It fails because of the "Z" suffix at the end. If you replace it with "+00:00", you'll be in business.
Python 3.9.5 (default, May 24 2021, 12:50:35)
[GCC 11.1.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import datetime
>>> def fromisoformat(s):
... return datetime.fromisoformat(s.rstrip("Z") + "+00:00")
...
>>> fromisoformat("2021-12-31T05:00:00.000Z")
datetime.datetime(2021, 12, 31, 5, 0, tzinfo=datetime.timezone.utc)
>>>
As per documentation for fromisoformat(), it seems that 'Z' (which stands for UTC) is not recognised as a valid offset. Replacing it with +00:00 seems to work.
Other time zones would not be an issue as they are already automatically represented with a numerical offset. eg: +05:30 for IST.
The problem is the z at the end of your string.
from datetime import datetime
date = '2021-12-31T05:00:00.000'
t = datetime.fromisoformat(date)
print(t)
