Year, Month, Day are columns in MyTable table
Create Date from numbers
To create Date: DATEFROMPARTS ( year, month, day )
Select
datetimefromparts([Year], [Month], [Day]) as Submission_Date
From MyTable
Output: 2019-01-02
Create Date and Time from numbers
To create Date and Time: DATETIMEFROMPARTS ( year, month, day, hour, minute, seconds, milliseconds )
Select
datetimefromparts([Year], [Month], [Day], 00,00,00,0) as Submission_Date
From MyTable
Output: 2022-06-20 00:00:00.000