Date Difference Ffunction

posted Oct 17, 2014, 4:49 PM by Sachchida Ojha

PostgreSQL does not provide DATEDIFF function similar to SQL Server DATEDIFF, but you can use various expressions or UDF to get the same results.

	SQL Server and Sybase	PostgreSQL
Years	DATEDIFF(yy, start, end)	DATE_PART('year', end) - DATE_PART('year', start)
Months	DATEDIFF(mm, start, end)	years_diff * 12 + (DATE_PART('month', end) - DATE_PART('month', start))
Days	DATEDIFF(dd, start, end)	DATE_PART('day', end - start)
Weeks	DATEDIFF(wk, start, end)	TRUNC(DATE_PART('day', end - start)/7)
Hours	DATEDIFF(hh, start, end)	days_diff * 24 + DATE_PART('hour', end - start )
Minutes	DATEDIFF(mi, start, end)	hours_diff * 60 + DATE_PART('minute', end - start )
Seconds	DATEDIFF(ss, start, end)	minutes_diff * 60 + DATE_PART('minute', end - start )

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