Mysql time conversion function usage _ PHP Tutorial

Mysql time conversion function usage. Mysql time conversion function usage 2007-10-3115: 03 DAYOFWEEK (date) returns the index of the week of the date (1 Sunday, 2 Monday, 7 Saturday ). These index values correspond to the ODBC standard. Mys mysql time conversion function usage 2007-10-31 15: 03 DAYOFWEEK (date)
Returns the index of the week of the date (1 = Sunday, 2 = Monday ,...... 7 = Saturday ). These index values correspond to the ODBC standard.
Mysql> select DAYOFWEEK (2007-10-31 );
-> 4

WEEKDAY (date)
Returns the week index of date (0 = Monday, 1 = Tuesday ,...... 6 = Sunday ).
Mysql> select WEEKDAY ('2017-10-31 13:05:00 ');
-> 2
Mysql> select WEEKDAY ('2017-10-31 ');
-> 2

DAYOFMONTH (date)
Returns the date of a month in the range of 1 to 31.
Mysql> select DAYOFMONTH ('2017-10-31 ');
-> 31

DAYOFYEAR (date)
Returns the number of days in a year from 1 to 366.
Mysql> select DAYOFYEAR ('2017-10-31 ');
-> 304

MONTH (date)
Returns the month of date, ranging from 1 to 12.
Mysql> select MONTH ('2017-10-31 ');
-> 10

DAYNAME (date)
Returns the week name of date.
Mysql> select DAYNAME ("2007-10-31 ");
-> 'Wednesday'

MONTHNAME (date)
Returns the month name of date.
Mysql> select MONTHNAME ("2007-10-31 ");
-> 'October'

QUARTER (date)
Returns the quarter of a year from date, ranging from 1 to 4.
Mysql> select QUARTER ('2017-10-31 ');
-> 4

WEEK (date)
　
WEEK (date, first)
If Sunday is the first day of a week, there is a single parameter that returns the number of weeks of the date, ranging from 0 to 52. Two parameter formats: WEEK () allows you to specify whether the WEEK starts on Sunday or Monday. If the second parameter is 0, the week starts from Sunday, and if the second parameter is 1, it starts from Monday.
Mysql> select WEEK ('2017-02-20 ');
-> 7
Mysql> select WEEK ('2017-02-20 ', 0 );
-> 7
Mysql> select WEEK ('2017-02-20 ', 1 );
-> 8

YEAR (date)
Returns the year of date, ranging from 1000 to 9999.
Mysql> select YEAR ('98-02-03 ');
-> 1998

HOUR (time)
Returns the hour of time, ranging from 0 to 23.
Mysql> select HOUR ('10: 05: 03 ');
-> 10

MINUTE (time)
Returns the minute of time, ranging from 0 to 59.
Mysql> select MINUTE ('98-02-03 10:05:03 ');
-> 5

SECOND (time)
The number of seconds for the return time, ranging from 0 to 59.
Mysql> select SECOND ('10: 05: 03 ');
-> 3

PERIOD_ADD (P, N)
Add N months to phase P (in the format of YYMM or YYYYMM ). Return value in the format of YYYYMM. Note that the phase parameter P is not a date value.

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