mysql date and time and conversion time stamp function

Source: Internet
Author: User
Keywords Network programming Mysql tutorial
Tags code date example function how to index mysql mysql tutorial

The formula for converting the timestamp using execl is:

Code:
= (xxxxxxxxxx + 8 * 3600) / 86400 + 70 * 365 + 19

Explain the timestamp syntax using the mysql tutorial statement Example:

Code:

select from_unixtime (1234567890, '% y-% m-% d% h:% i:% s')

Attachment:
In mysql, a time field storage type is int (11), how to convert into a character type, for example, stored as 13270655222, need to be converted into yyyy-mm-dd form from_unixtime function, as follows:

Code:
from_unixtime (unix_timestamp, format)
Returns a string representing the unix timestamp, formatted according to the format string. format can contain the same modifiers as the entries listed by the date_format () function.
Format the date value according to the format string. The following modifiers can be used in the format string:% m month name (january ... december)
% w week name (sunday ... saturday)
% d Date of the month with English prefix (1st, 2nd, 3rd, etc.)
% y year, number, 4 digits
% y year, number, 2 digits
% a abbreviated week name (sun ... sat)
% d The number of days in the month, the number (00 ... 31)
% e Number of days in the month, digits (0 ... 31)
% m month, number (01 ... 12)
% c month, number (1 ... 12)
% b abbreviated month name (jan ...... dec)
% j Number of days in a year (001 ... 366)
% h hours (00 ... 23)
% k hours (0 ... 23)
% h hours (01 ... 12)
% i hours (01 ... 12)
% l hour (1 ... 12)
% i minutes, numbers (00 ... 59)
% r time, 12 hours (hh: mm: ss [ap] m)
% t time, 24 hours (hh: mm: ss)
% s seconds (00 ... 59)
% s seconds (00 ... 59)
% p am or pm
% w Days in a week (0 = sunday ... 6 = saturday)
% u week (0 ... 52), where Sunday is the first day of the week
% u week (0 ... 52), where Monday is the first day of the week
%% a text "%".

related functions

mysql> select something from tbl_name
where to_days (now ()) - to_days (date_col) <= 30;

dayofweek (date)
Returns the weekday index of date (1 = sunday, 2 = monday, ... 7 = saturday). Index value in line with odbc standards.
mysql> select dayofweek ('1998-02-03');
-> 3

weekday (date)
Returns the index of the day of the week (0 = monday, 1 = tuesday, ... 6 = sunday):
mysql> select weekday ('1998-02-03 22:23:00');
-> 1
mysql> select weekday ('1997-11-05');
-> 2

dayofmonth (date)
The return date is the first few days of January, ranging from 1 to 31:
mysql> select dayofmonth ('1998-02-03');
-> 3

dayofyear (date)
Return date is the first few days of the year, the range of 1 to 366:
mysql> select dayofyear ('1998-02-03');
-> 34

month (date)
Returns the month in the date range from 1 to 12:
mysql> select month ('1998-02-03');
-> 2

dayname (date)
The name of the week that returns date
mysql> select dayname ("1998-02-05 ');
-> 'thursday'

monthname (date)
Returns the name of the month of the date:
mysql> select monthname ("1998-02-05 ');
-> 'february'

quarter (date)
Returns the date in the quarter of the year in the range of 1 to 4:
mysql> select quarter ('98 -04-01 ');
-> 2

week (date)
week (date, first)

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.