Base_Engine: Create a useable DateTime for RandomObject

[adecler]

Closes #2408

Added code suggestion made in the issue with a few minor tweaks.

Test files

Create random objects of any type that has a DateTime property (I used Issue).

[FraserGreenroyd]

Couldn't find any test scripts but replicated what the PR suggested with an Inspection.Issue. Date related fields had some sufficiently random dates which resolves the scope of the issue raised.

[tg359]

I checked using a similar script to the one posted in the issue raised, and dates created are all after 1970 so it looks like it's working.

Thanks @adecler!

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