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. 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. Returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate. Note that DATEDIFF returned 2 days, although there is only 1 day and 2 hours between the datetime. 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(DAY, '', '') +1 You need to add 1 to the DATEDIFF function and it will work as you want. Consider SQL Server function to calculate the difference between 2 dates in days: SQL Server: - Difference between 23:00 and 01:00 in days SELECT DATEDIFF (day, ' 23:00:00', ' 01:00:00') - Result: 2. In other words, we can say the dateadd () function is used to return the. In this case, the function returns 1 year despite the fact that these dates are only one day apart. 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. As with many software products from the US, the first day of the week in Redshift (at least far as DATEDIFF is concerned) is Sunday, and not the ISO. 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. Use the TIMESTAMPTZ data type to input complete timestamp values that include the date, the time of day, and a time zone. 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 get the complete list of possible values, please refer to the. To view a list of supported time zone names, run the following command. The dateadd() function accepts second, minute, hour, day, week, month, and year. It calculates the difference in years between the birth date and the date in one year (minus one day) to account for partial years. If the second date or time is later than the first date or time, the result is positive. datediff (year, dob, currentdate + interval '1 year' - interval '1 day') as age. If the second date or time is earlier than the first date or time, the result is negative.
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