DATETRUNC This function can be thought of as date rounding. DATEPART Returns the name of the specified date part as an integer. Pay particular attention to the words datepart boundaries crossed. WEEK (): This date part begins on WEEKDAY.DATEDIFF supports the following datepart values: DAY WEEK This date part begins on Sunday. If the first date occurs before the second date, then the result is non-positive. DATEPARSE Returns specifically formatted strings as dates. The Actual Definition of DATEDIFF () The reason we get the results we do is because the DATEDIFF () function is defined as follows: This function returns the count (as a signed integer value) of the specified datepart boundaries crossed between the specified startdate and enddate. DATEDIFF Description Returns the number of datepart boundaries between the two dateexpression s. DATENAME Returns the name of the specified date part as a discrete string. Difference between two dates in days PostgreSQL: DATEPART(day,date2 - date1) MySQL: DATEDIFF(date1,date2) Redshift: DATEDIFF(day,date1,date2). Smaller units are not used, so values are not rounded. DATEDIFF Returns the number of date parts (weeks, years, etc) between two dates. Used to determine the result and thus determines the precision of the result. month) used to calculate the difference determines which parts of the DATE, TIME, or TIMESTAMP field are For more details, including examples, see If date_or_time_part is week (or any of its variations), the output is controlled by the WEEK_START session parameter. ![]() The function supports units of years, quarters, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds.Äate_or_time_part must be one of the values listed in Supported Date and Time Parts. In Sybase ASE you can use DATEDIFF function to get the difference between two datetime values in the specified interval units (days, hours, minutes etc.). ![]() tochar (currentdate,'YYYYMMDD') '20220407' Similarly, to convert a string to date use the Redshift todate function. To convert a date to a string use the Redshift tochar function as below. Output values can be negative, for example, -12 days.Äate_or_time_expr1 and date_or_time_expr2 can be a date, time, or timestamp. The default Redshift date format is YYYY-MM-DD.
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