1) date_format function (in accordance with the format finishing date)
Action: a string format for the specified date format.
SELECT DATE_FORMAT ( ' 2017-01-01 ' , ' yyyy-MM-dd HH: mm: SS ' ); - the date string must meet the format yyyy-MM-dd
Results: 2017-01-01 00:00:00
2) date_add, date_sub function (subtraction date)
Effect of: a date format string plus one day, minus one day.
SELECT DATE_ADD ( ' 2019-01-01 ' , . 1 ); - string must meet the format yyyy-MM-dd
Results: 2019-01-02
SELECT DATE_SUB ( ' 2019-01-01 ' , . 1 ); - string must meet the format yyyy-MM-dd
Results: 2018-12-31
3) next_day function
Role: to give a specific date for next week's string of dates of several
SELECT next_date ( ' 2020-01-01 ' , ' Fri ' ); - obtain a first subsequent Friday 2020-01-01
Results: 2020-01-03
4) last_day function (the last day of the month demand date)
Role: seeking the last day of the month date
select last_day('2020-01-01');
Results: select last_day ( '2020-01-01');
5) from_unixtime ( 'bigint stamp', 'pattern') function together with 5,6, used to the date string is not yyyy-MM-dd into the standard yyyy-MM-dd date string
Effect: the time stamp of a large number, the date string is converted to a specified format
select from_unixtime(1517725479,'yyyy-MM-dd HH:dd:ss'); select from_unixtime(1517725479,'yyyyMMdd');
Results: 2018-02-04 14:04:39
20180204
6) unix_timestamp ( 'date string', 'pattern') 5,6 together with, used to the date string is not yyyy-MM-dd into a standard date string is yyyy-MM-dd
Action: the date stamp converted into the specified format
select unix_timestamp('2020/01/01','yyyy/MM/dd');
RESULTS: 1577808000
7）current_date()
Role: get the current date string
select current_date();
Results: 2020-01-01
8）current_timestamp()
Role: get the current time string
select current_timestamp();
Results: 2020-01-0113: 52: 46.018
9) unix_timestamp()
Role: get the current timestamp
select unix_timestamp();
RESULTS: 1577858367