Add UTCDateTime encoder/decoder for state file utils

Adds basic UTCDateTime JSON encoder/decoder functions to util for use by the state file reader and writers. Should fix the state file write errors that we are seeing now.

requested review from @awernle

assigned to @bgeels

requested review from @erigler and removed review request for @awernle

I approve. I left comments because I'm curious how we might tweak this solution to be more generic (that is, to work on data types other than UTCDateTime). No need to actually change anything for this MR.

approved this merge request

added 1 commit

• 2590a992 - Add optional encoder/decoder params to json util functions

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resolved all threads

mentioned in commit a0761858

merged