Update datetime filter to handle timezone info

[wuz75]

Pull Request Description

Problem:
This pull request fixes a ValueError encountered while parsing datetime strings in the Flask app. The error occurred because the datetime format did not account for timezone information (+00:00).

Fix:
Added the %z format specifier in the datetime.strptime method to handle the timezone offset correctly.

Changes:
Updated the code in app.py from:

date = dt.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")

to:

date = dt.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f%z")

also added backwards compatibility with try/except.

[wuz75]

@computron
could you please look at this? the latest pipy version of fireworks still has this bug.

[computron]

Thanks!