[FIX] Pivot: Display time variable in time format

[VesnaT]

Issue

Fixes #5180 for TimeVariable.

Description of changes

Display TimeVariable values in time format.

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

Merging #5212 (510aa22) into master (0d6da92) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5212   +/-   ##
=======================================
  Coverage   85.17%   85.18%           
=======================================
  Files         299      299           
  Lines       60888    60906   +18     
=======================================
+ Hits        51864    51884   +20     
+ Misses       9024     9022    -2     

[ajdapretnar]

I'm getting the below error then opening Pivot Table. Looking at the code it doesn't make sense, but probably I am missing something. 🤷

----------------------------- TypeError Exception -----------------------------
TypeError: sizeHint() missing 1 required positional argument: 'self'
-------------------------------------------------------------------------------

[VesnaT]

Fixed.