Update how datetime format is set and used

[rosswhitfield]

Description of the changes

Ref 7059: [WebMon] Standardize timestamp format

The datetime format should now be consistent everywhere in the web monitor. It has also been configured slightly differently to be parsable and still human readable. In order to change all the datetime formats you just need to update src/webmon_app/reporting/formats/en_US/formats.py.

By creating and using the formats module instead of setting DATETIME_FORMAT directly in the settings, datetime's will automatically be formatted by the django template engine. And we can make use of the django.utils.formats.localize.

Check all that apply:

• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• (If applicable) Verified that manual tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items:
• Links to related issues or pull requests:

Manual test for the reviewer

(Instructions for testing here)

Check list for the reviewer

• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.33%. Comparing base (6077aad) to head (1c4e10a).

Files with missing lines	Patch %	Lines
src/webmon_app/reporting/report/admin.py	0.00%	2 Missing ⚠️
src/webmon_app/reporting/dasmon/view_util.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #184      +/-   ##
==========================================
+ Coverage   77.25%   77.33%   +0.08%     
==========================================
  Files          50       51       +1     
  Lines        4633     4611      -22     
==========================================
- Hits         3579     3566      -13     
+ Misses       1054     1045       -9     

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[backmari]

I didn't know about Django's format module, but this looks like the appropriate way to format datetimes. As far as I understand, the template engine should format datetime objects automatically. @rosswhitfield did you test without formats.localize - is that needed for the formatting to be applied?
I tested locally and all the views I found had the datetimes formatted consistenly according to the new format.

[rosswhitfield]

I didn't know about Django's format module, but this looks like the appropriate way to format datetimes. As far as I understand, the template engine should format datetime objects automatically. @rosswhitfield did you test without formats.localize - is that needed for the formatting to be applied? I tested locally and all the views I found had the datetimes formatted consistenly according to the new format.

format.localize is only needed when not rendering a template, so for example get_update that returns data as json. If you return render(...) then the formatting is automatically applied.