How to get difference between two dates – TSQL

o calculate the difference between two dates, you can use DATEDIFF() function. The DATEDIFF() function returns the number of days/month/years and time between two dates.

Syntax:

DATEDIFF (date part, start date, end date)

For example, to calculate time left till Independence Day, you can use:

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DECLARE     @Today      DATETIME = GETDATE()

DECLARE     @IDay       DATETIME = '2011-08-15 08:30:00'

SELECT DATEDIFF(DAY, @Today, @IDay),      'Days Left'

UNION ALL

SELECT DATEDIFF(MONTH, @Today, @IDay),    'Months Left'

UNION ALL

SELECT DATEDIFF(YEAR, @Today, @IDay),     'Years Left'

UNION ALL

SELECT DATEDIFF(QUARTER, @Today, @IDay),  'Quarters Left'

UNION ALL

SELECT DATEDIFF(HOUR, @Today, @IDay),     'Hours Left'

UNION ALL

SELECT DATEDIFF(MINUTE, @Today, @IDay),   'Minutes Left'

UNION ALL

SELECT DATEDIFF(SECOND, @Today, @IDay),   'Seconds Left'

Result Set:

———– ————-

86          Days Left

3           Months Left

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