diff options
Diffstat (limited to 'include/mysql_time.h')
| -rw-r--r-- | include/mysql_time.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/mysql_time.h b/include/mysql_time.h index ec67d60dea5..5f4fc12c005 100644 --- a/include/mysql_time.h +++ b/include/mysql_time.h @@ -33,6 +33,18 @@ enum enum_mysql_timestamp_type }; +/* + Structure which is used to represent datetime values inside MySQL. + + We assume that values in this structure are normalized, i.e. year <= 9999, + month <= 12, day <= 31, hour <= 23, hour <= 59, hour <= 59. Many functions + in server such as my_system_gmt_sec() or make_time() family of functions + rely on this (actually now usage of make_*() family relies on a bit weaker + restriction). Also functions that produce MYSQL_TIME as result ensure this. + There is one exception to this rule though if this structure holds time + value (time_type == MYSQL_TIMESTAMP_TIME) days and hour member can hold + bigger values. +*/ typedef struct st_mysql_time { unsigned int year, month, day, hour, minute, second; |