Posted on 2014-02-03
Medium Priority
Last Modified: 2014-02-03
I am going to write a report based on week number of the year.

DATE Example: 20161225

When I run this date using mysql I get 2 different values for the WEEK Number.

My select statement:

WEEK(`charters`.`start_date`, '%u') AS 'ISO_WEEK'

This returns "52" for the week number

DATE_FORMAT(`charters`.`start_date`, %v') AS 'ISO_WEEK2'

This returns "51" for the week number

Witch one should I use?
Question by:Robert Saylor
LVL 143

Accepted Solution

Guy Hengel [angelIII / a3] earned 2000 total points
ID: 39829219
for WEEK, the 2nd argument will specify what the result value will be, and %u seems like incorrect, it must be a value from 0 to 7 instead.

and in date_format:
if you used %v, this would match 3 or 7 (see the exact rules)
if you used %u, this would have 1 or 5 (see the exact rules)

so, the answer is: it depends on what you want to use as rules/output

Author Closing Comment

by:Robert Saylor
ID: 39829299
Thank you! I was not passing the mode correctly in WEEK. Looks good now and I have something to report on when the WEEK number starts.

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