User:Jc3s5h/sandbox3

#time extension parser function
Function is documented at mw:Help:Extension:ParserFunctions

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Note that precision of output exceeds precision of input for this case:

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Attempts to deal with Julian date by "fixing" month, also too precise:

JULIANDAY.TIMESTAMP testing date change
Tenth of a day increments beginning midnight UT at beginning of 3 November 2022.

Same sequence, but showing time: