What are the mysql date conversion functions?

Mysql date conversion functions are: 1. date_format(); 2. time_format(); 3. str_to_date(); 4. to_days(); 5. from_days(); 6. time_to_sec(); 7. sec_to_time() etc.

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

MySQL date conversion function, time conversion function

1, MySQL Date/Time to Str (date/time converted to string) function: date_format( date,format), time_format(time,format)：

Function: date_format('2008-08-08 22:23:01', '%Y %m%d%H%i%s')

Result: 20080808222301

MySQL date and time conversion function: date_format (date,format), time_format(time,format) can convert a date/time into various string formats. It is an inverse conversion of the str_to_date(str,format) function.

2, MySQL Str to Date (convert string to date) function: str_to_date(str, format)：

select str_to_date('08/09/2008', '%m/%d/%Y'); -- 2008-08-09
select str_to_date('08/09/08' , '%m/%d/%y'); -- 2008-08-09
select str_to_date('08.09.2008', '%m.%d.%Y'); -- 2008-08-09
select str_to_date('08:09:30', '%h:%i:%s'); -- 08:09:30
select str_to_date('08.09.2008 08:09:30', '%m.%d.%Y %h:%i:%s'); -- 2008-08-09 08:09:30

str_to_date(str,format) Conversion function can convert some messy strings into date format.

3, MySQL (date, number of days) conversion function: to_days(date), from_days(days):

select to_days('0000-00-00'); -- 0
select to_days('2008-08-08'); -- 733627

4, MySQL ( time, seconds) conversion function: time_to_sec(time), sec_to_time(seconds):

select time_to_sec('01:00:05'); -- 3605
select sec_to_time(3605); -- '01:00:05'

5, MySQL piece together date and time function: makdedate( year,dayofyear), maketime(hour,minute,second)：

select makedate(2001,31); -- '2001-01-31'
select makedate(2001,32); -- '2001-02-01'
select maketime(12,15,30); -- '12:15:30'

6, MySQL (Unix timestamp, date) conversion function:

unix_timestamp(),
unix_timestamp(date),
from_unixtime(unix_timestamp),
from_unixtime(unix_timestamp,format)

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