DMN16 — Allow for partial temporal values

It should be possible to define partial temporal values but only for trailing precisions (i.e., if you specify a day, you must also specify a year and month)
Values of type Date, the precision unit must be one of: years, months, or Days
e.g. date( 2019 ), date( 2019, 09 ), date( 2019, 09, 17)
Values of type Time, the precision unit must be one of: hours, minutes, or seconds
e.g. time( 09 ), time( 09, 55), time( 09, 55, 00)
Values of type Date and Time, the precision unit must be one of: years, months, days, hours, minutes, or seconds
e.g. date and time( date(2019,09,17), time(09,55) ), date and time( “2019-09-17T09:55”)

Operations carried out on elements with different time based precision units shall be done based on the lowest common precision unit (truncating any resulting decimal portion) 

Defer to DMN 1.7

Defer to DMN 1.7