This can be done in powershell or bash or perl (listed in order of preference)
I have a log file in CSV (with headers), I need to select a subset of it, transform a date and time field to epoch then give an output in JSON.
Only select rows from csv where context = patient
Change date_time to epoch (integer)
populate json where the calculated epoch $CE is entered as a point [$CE,1] in the json.
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Perl has efficient libraries that can handle json objects. I do not know if you want implementations in the following as well: Powershell, bash. Can you please confirm.