The MySQL DATEDIFF() function can also be used with interval adjustments, to calculate the difference between two adjusted dates.Calculating Daily Average Date/Time Intervals in MySQL by Robert Gravelle.It can be used with date expressions or date columns in a table.This function can also be used to calculate the number of weeks, months, quarters, or years between two dates, by dividing the result by a specified number of days.It takes two date arguments and returns an integer value representing the number of days between them.The DATEDIFF() function calculates the number of days between two dates.The first date is adjusted by adding 1 year, and the second date is adjusted by adding 1 month. In this example, the MySQL DATEDIFF() function calculates the number of days between the two dates -01, but with an interval adjustment. Here are some examples of the MySQL DATEDIFF() function with different input parameters:Ĭalculate the number of days between two dates: If the result is outside the range of the INT data type, an error will be raised. In all cases, the MySQL DATEDIFF() function will return an integer representing the number of days between the two dates or expressions. The expressions can be any valid date or date-time values, including column names or subqueries that return dates. In this case, the function will calculate the difference between two expressions that evaluate dates. The expr1 and expr2 parameters are expressions that are added to the corresponding dates, and the unit1 and unit2 parameters specify the units for the expressions. In this case, the function will calculate the difference between two dates that have been adjusted by an interval. In this case, the function will calculate the number of days between date1 and date2.ĭATEDIFF(date1 + INTERVAL expr1 unit1, date2 + INTERVAL expr2 unit2) There are several possible combinations of input parameters for the MySQL DATEDIFF() function, as follows: It works by subtracting the second date from the first date and returning the result as an integer. The MySQL DATEDIFF() function calculates the number of days between two dates or date expressions. How does the MySQL DATEDIFF() Function Work? If the dates being compared fall outside this range, DATEDIFF() may return unexpected results or an error. For example, it can only calculate the difference between dates within the range of -31. Date range limitations: DATEDIFF() function has some limitations on the range of dates it can handle.To avoid this issue, you can convert both dates to a common timezone before using DATEDIFF(). This is because DATEDIFF() calculates the difference between the dates based on the server's timezone, not the timezone of the dates themselves. Timezone differences: If the two dates being compared are in different time zones, DATEDIFF() may return unexpected results.If the two dates are in different formats, DATEDIFF() may return unexpected results or an error. Different date formats: DATEDIFF() function expects both dates to be in the same format, such as YYYY-MM-DD.While MySQL DATEDIFF() is a useful tool for calculating the difference between two dates, there are some scenarios where it may not work as expected. If the two dates are the same, the result is 0. If date1 is earlier than date2, the result is negative. If date1 is later than date2, the result is positive. The return value of the MySQL DATEDIFF() function is an integer that represents the number of days between the two dates. Return Value of MySQL DATEDIFF() Function The MySQL DATEDIFF() function calculates the number of days between these two dates. These arguments represent the two dates you want to compare. It can also be a date string or a date value in a column of a table.
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