Add Time and Date merge tag :format modifier

[omarkasem]

This implements #2040.

• I created merge tags modifier 'format' for both time and date
• The only thing that is not clear to me is when does this hook run
  gravityview/merge_tags/modifiers/value
  I tried a lot of values and modifiers but I can't get it to run so i can see if it has anything to do with date or time
  {Time:4:format:g:i a}
  {Date:3:format:m-d-Y}

💾 Build file (2930ecf).

[mrcasual]

@omarkasem, in addition to my comments, could you also please add some unit tests?

[omarkasem]

@mrcasual
So the tests are working fine because I'm calling process_modifiers directly but the main issue here is with the view in custom content with any date or time formats that has uppercase like D for days or F for months, gravityforms do strtolower to the modifier before it reaches to our function so there's no way to know what it was before or prevent that (see screenshot)

Do you have any idea how to bypass that? or should i try process the date and time away from that function like i was doing before.

[mrcasual]

@omarkasem, please see my solution: 2930ecf.

[omarkasem]

@mrcasual
Yeah that's very smart to store it in a variable then call it back, well done 👍 🎩