If the second date or time is earlier than the first date or time, the result is negative. If the second date or time is later than the first date or time, the result is positive. For example, because the common calendar starts from the year 1, the first decade (decade 1) is through, and the second decade (decade 2) is through. If you want to get 1. Amazon Redshift interprets the DECADE or DECADES DATEPART based on the common calendar. The expressions must both contain the specified date or time part. You are missing an ELSE clause in your CASE statement. If you are finding the difference in hours between two timestamps, 8:30:00 and 10:00:00, the result is 2 hours.Ī DATE, TIME, TIMETZ, or TIMESTAMP column or expressions that implicitly convert to a DATE, TIME, TIMETZ, or TIMESTAMP. If you are finding the difference in hours between two timestamps, 01-01-2009 8:30:00 and 01-01-2009 10:00:00, the result is 2 hours. In this case, the function returns 1 year despite the fact that these dates are only one day apart. For example, suppose that you're calculating the difference in years between two dates, 12-31-2008 and 01-01-2009. Specifically, DATEDIFF determines the number of date part boundaries that are crossed between two expressions. For more information, see Date parts for date or timestamp functions. The specific part of the date or time value (year, month, or day, hour, minute, second, millisecond, or microsecond) that the function operates on. Checking the docs for Amazon Redshift shows this: DATEDIFF ( datepart, )ĭatepart: The specific part of the date or time value (year, month, or day, hour, minute, second, millisecond, or microsecond) that the function operates on.DATEDIFF ( datepart, ) Specifically, DATEDIFF determines the number of date part boundaries that are crossed between two expressions.For more information, see Date parts for date or timestamp functions.
For example, the dateadd () is one of the functions provided by Redshift. Because smalldatetime is accurate only to the minute, seconds and milliseconds are always set to 0 in the return value when startdate or enddate have a smalldatetime value. Basically, the dateadd () function is used to return the new date-time values by adding the required date and timestamp, or we can say the specified date and timestamp as per user requirement.įor example, suppose that you're calculating the difference in years between two dates, 12-31-2008 and 01-01-2009. DATEDIFF uses the time zone offset component of startdate or enddate to calculate the return value. In other words, we can say the dateadd () function is used to return the. If you are finding the difference in hours between two timestamps, 8:30:00 and 10:00:00, the result is 2 hours.ĭate|time|timetz|timestamp: A DATE, TIME, TIMETZ, or TIMESTAMP column or expressions that implicitly convert to a DATE, TIME, TIMETZ, or TIMESTAMP. Return type TIMESTAMP or TIME or TIMETZ depending on the input data type. The DATE, TIME, TIMETZ, or TIMESTAMP expression must contain the specified date part. Use the TIMESTAMPTZ data type to input complete timestamp values that include the date, the time of day, and a time zone. Redshift DATEDIFF Function 1) Redshift DATEDIFF Function: Syntax The syntax of the Redshift DATEDIFF function is as follows DATEDIFF (datepart. Use the TIMESTAMPTZ data type to input complete timestamp values that include the date, the time of day, and a time zone. A DATE, TIME, TIMETZ, or TIMESTAMP column or an expression that implicitly converts to a DATE, TIME, TIMETZ, or TIMESTAMP. The expressions must both contain the specified date or time part. When an input value includes a time zone, Amazon Redshift uses the time zone to convert the value to UTC and stores the UTC value. To view a list of supported time zone names, run the following command. When an input value includes a time zone, Amazon Redshift uses the time zone to convert the value to UTC and stores the UTC value. If the second date or time is later than the first date or time, the result is positive. DATEDIFF devuelve la diferencia entre las partes de fecha de dos expresiones de fecha u hora.
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