Question

In my PHP code I’m using date(“N”) ISO-8601 numeric representation of the day of the week 1 (for Monday) through 7 (for Sunday).

Now when I wanted to make a query to search for a specific date.

I found that in MySQL:

• The date_format using %w will return (0=Sunday..6=Saturday)

• The DAYOFWEEK(date) will return (1 = Sunday .. 7=Saturday)

Is there a fast way to fix this issue without doing some PHP ?

Answer 1

Trying to match…

PHP date('N'):

Mon Tue Wed Thu Fri Sat Sun
1   2   3   4   5   6   7

To one of these…

MySQL DATE_FORMAT(col, '%w'):

Mon Tue Wed Thu Fri Sat Sun
1   2   3   4   5   6   0

MySQL DAYOFWEEK(col):

Mon Tue Wed Thu Fri Sat Sun
2   3   4   5   6   7   1

I would use a CASE statement with DATE_FORMAT as you only have to worry about Sunday.

SELECT
    CASE
        WHEN DATE_FORMAT(col, '%w') = 0
            THEN 7
        ELSE DATE_FORMAT(col, '%w')
   END AS dayofweek
...