Rounding dates

SQL Server does not have an intuitive way to round down to the month, hour, or minute. You can, however, combine the DATEADD() and DATEDIFF() functions to perform this rounding.

To round the date 1914-08-16 down to the year, we would call DATEADD(YEAR, DATEDIFF(YEAR, 0, '1914-08-16'), 0).

To round the date down to the month, we would call DATEADD(MONTH, DATEDIFF(MONTH, 0, '1914-08-16'), 0).

This works for several other date parts as well.

Deze oefening maakt deel uit van de cursus

Time Series Analysis in SQL Server

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Oefeninstructies

Use DATEADD() and DATEDIFF() in conjunction with date parts to round down our time to the day, hour, and minute.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

DECLARE
	@SomeTime DATETIME2(7) = '2018-06-14 16:29:36.2248991';

-- Fill in the appropriate functions and date parts
SELECT
	DATEADD(___, DATEDIFF(DAY, 0, @SomeTime), 0) AS RoundedToDay,
	___(___, ___(___, 0, @SomeTime), 0) AS RoundedToHour,
	___(___, ___(___, 0, @SomeTime), 0) AS RoundedToMinute;

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