diff options
| -rw-r--r-- | django/core/db/backends/mysql.py | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/django/core/db/backends/mysql.py b/django/core/db/backends/mysql.py index d1a3e7ee12..1a8ce10e81 100644 --- a/django/core/db/backends/mysql.py +++ b/django/core/db/backends/mysql.py @@ -106,6 +106,9 @@ def get_date_trunc_sql(lookup_type, field_name): # http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html # MySQL doesn't support DATE_TRUNC, so we fake it by subtracting intervals. # If you know of a better way to do this, please file a Django ticket. + # Note that we can't use DATE_FORMAT directly because that causes the output + # to be a string rather than a datetime object, and we need MySQL to return + # a date so that it's typecasted properly into a Python datetime object. subtractions = ["interval (DATE_FORMAT(%s, '%%%%s')) second - interval (DATE_FORMAT(%s, '%%%%i')) minute - interval (DATE_FORMAT(%s, '%%%%H')) hour" % (field_name, field_name, field_name)] if lookup_type in ('year', 'month'): subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%e')-1) day" % field_name) |