You can use the DateDiff function to determine how many specified time intervals exist between two dates. For example, you might use DateDiff to calculate the number of days between two dates, or the number of weeks between today and the end of the year. … It counts the number of Sundays between date1 and date2.

What is datediff SQL?

DATEDIFF() is a basic SQL Server function that can be used to do date math. Specifically, it gets the difference between 2 dates with the results returned in date units specified as years, months days, minutes, seconds as an int (integer) value. Syntax: DATEDIFF( DatePart, StartDate, EndDate )

What are the three parameters of datediff function?

This function accepts three parameters namely interval, first value of date, and second value of date.