Finding the Day of the Week for a Date
5.25.1 Problem
You want to know the day of the week a date falls on.
5.25.2 Solution
Use the DAYNAME( ) function.
5.25.3 Discussion
To determine the name of the day of the week for a given date, use DAYNAME( ):
mysql> SELECT CURDATE( ), DAYNAME(CURDATE( )); +------------+--------------------+ | CURDATE( ) | DAYNAME(CURDATE( )) | +------------+--------------------+ | 2002-07-15 | Monday | +------------+--------------------+
DAYNAME( ) is often useful in conjunction with other date-related techniques. For example, to find out the day of the week for the first of the month, use the first-of-month expression from earlier in the chapter as the argument to DAYNAME( ):
mysql> SET @d = CURDATE( );
mysql> SET @first = DATE_SUB(@d,INTERVAL DAYOFMONTH(@d)-1 DAY);
mysql> SELECT @d AS 'starting date',
-> @first AS '1st of month date',
-> DAYNAME(@first) AS '1st of month day';
+---------------+-------------------+------------------+
| starting date | 1st of month date | 1st of month day |
+---------------+-------------------+------------------+
| 2002-07-15 | 2002-07-01 | Monday |
+---------------+-------------------+------------------+
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