1. update all date related functions' signatures order.
1.1. if return value need to be compute with time info, args with datetimev2 at the top of the list, followed by datev2, datetime and date
1.2. if return value need to be compute with only date info, args with datev2 at the top of list, followed by datetimev2, date and datetime
2. Priority for use datev2, if we must cast date to datev2 or datetime/datetimev2
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