sql time format conversion in the main: DATE_FORMAT function, STR_TO_DATE function
1. First select a database
use db_name;
2. Display the time of the current time zone:
SELECT NOW();
3. format, the date_format functions:
select date_format(NOW(),'%W-%Y-%m-%d') as column_name; select date_format(NOW(),'%W-%Y-%m-%d') column_name;
4. The formatting code
%a |
Short weekday name in current locale (Variable lc_time_names). |
%b |
Short form month name in current locale. For locale en_US this is one of: Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov or Dec. |
%c |
Month with 1 or 2 digits. |
%D |
Day with English suffix 'th', 'nd', 'st' or 'rd''. (1st, 2nd, 3rd...). |
%d |
Day with 2 digits. |
%e |
Day with 1 or 2 digits. |
%f |
Sub seconds 6 digits. |
%H |
Hour with 2 digits between 00-23. |
%h |
Hour with 2 digits between 01-12. |
%I |
Hour with 2 digits between 01-12. |
%i |
Minute with 2 digits. |
%j |
Day of the year (001-366) |
%k |
Hour with 1 digits between 0-23. |
%l |
Hour with 1 digits between 1-12. |
%M |
Full month name in current locale (Variable lc_time_names). |
%m |
Month with 2 digits. |
%p |
AM/PM according to current locale (Variable lc_time_names). |
%r |
Time in 12 hour format, followed by AM/PM. Short for '%I:%i:%S %p'. |
%S |
Seconds with 2 digits. |
%s |
Seconds with 2 digits. |
%T |
Time in 24 hour format. Short for '%H:%i:%S'. |
%U |
Week number (00-53), when first day of the week is Sunday. |
%u |
Week number (00-53), when first day of the week is Monday. |
%V |
Week number (01-53), when first day of the week is Sunday. Used with %X. |
%v |
Week number (01-53), when first day of the week is Monday. Used with %x. |
%W |
Full weekday name in current locale (Variable lc_time_names). |
%w |
Day of the week. 0 = Sunday, 6 = Saturday. |
%X |
Year with 4 digits when first day of the week is Sunday. Used with %V. |
%x |
Year with 4 digits when first day of the week is Monday. Used with %v. |
%Y |
Year with 4 digits. |
%y |
Year with 2 digits. |
%# |
For str_to_date(), skip all numbers. |
%. |
For str_to_date(), skip all punctation characters. |
%@ |
For str_to_date(), skip all alpha characters. |
%% |
A literal % character. |
5 shows the current coding region, because of the time and local time (region related)
SELECT @@lc_time_names loc_name; #loc_name为显示的列名 SET lc_time_names = 'zh_CN'; #设置区域编码
参考：
https://www.cnblogs.com/wjm956/p/7297942.html
https://blog.csdn.net/shenliang1985/article/details/90142010