The HH_mm_ss format seems to be consistent

It seems not, given one of the datetimes shown in the OP is '2019-6-12T22:34:8'.

There is no chance of a name collision in that example since the year, month and day are repeated in the new name.

IMHO that's also a very dangerous assumption to make.

In reply to Re^4: Batch file renaming - on identical name, keep only most recent file, based on dates by haukex
in thread Batch file renaming - on identical name, keep only most recent file, based on dates by Anonymous Monk

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