In this tutorial, you have learned how to use the CAST() and TO_DATE() functions to convert a string to a date in SQL. DATEDIFF returnes the number of full weeks between the datetime values. If you really need that, then multiply the. The cast to an integer is necessary, because you can't specify fractional months using that function. As you have a fixed unit, using makeinterval () is the easiest way: SELECT datecreated + makeinterval (months > 'months'::integer) FROM thetable. Notice that the date format must be corresponding to the date string as specified in the statement DD MON YYYYĬheck it out the Oracle TO_DATE() and PostgreSQL TO_DATE() functions for the details. Consider SQL Server function to calculate the difference between 2 dates in weeks: SQL Server : - Difference between and in weeks SELECT DATEDIFF ( week, '', '') - Result: 1. You can add an interval directly to a date value. The following shows the TO_DATE() function syntax: TO_DATE(string, format)įor example, to convert the string '' to a date value, you use the following statement: SELECT TO_DATE( '', 'DD MON YYYY' ) Oracle and PostgreSQL provide the TO_DATE() function that converts a string to date based on a specified format. Here is the result: Code language: SQL (Structured Query Language) ( sql ) Convert string to date using TO_DATE() function Similarly, the following example also converts the string 180101 to January 1st, 2018: SELECT CAST( '180101' AS DATE) SQL Server converts the string 2018 to January 1st, 2018: The following example shows how to convert a string to a date: SELECT CAST( '2018' AS DATE) In case the function fails to convert, it issues an error, depending on the implementation of a specific database system. The CAST() function returns a DATE value if it successfully converts the string to date. In this syntax, the string can be any DATE value that is convertible to a date. The following illustrates the syntax of the CAST() function: CAST (string AS DATE)Ĭode language: SQL (Structured Query Language) ( sql ) With the help of the datediff Function, we. The datediff Function plays an important role in the database management system because datediff functions as a calendar and is very helpful to users. The datediff means we can return the difference between two dates based on their specified interval. We can use SQL Convert date format to represent this in HH:MM:SS format. PostgreSQL provides a datediff function to users. We specified value 0 in the DateADD SQL function. SQL provides a CAST() function that allows you to convert a string to a date. SELECT DATEADD(Minute,DATEDIFF(Minute, StartTime, EndTime),0) AS ElapsedTime It gives the elapsed time in minutes. Convert string to date using CAST() function Summary: in this tutorial, you will learn various functions that convert a string to a date in SQL.
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