Note: time1 and time2 should be in the same format, and the calculation is time1 - time2. You can store only this type, but you can use one of the many time format functions to change it, when you need to display it. SELECT CURRENTTIMESTAMP Here’s the result of the query: 11:13:17 Discussion: The CURRENTTIMESTAMP function in the MySQL database returns the current date and time (i.e.

Solution: We’ll use one of two functions, CURRENTTIMESTAMP or NOW(), to get the current date and time. You can set this dynamically: mysql> SET OK, 0 rows affected (0. The TIMEDIFF () function returns the difference between two time/datetime expressions. 'MySQL retrieves and displays DATETIME values in 'YYYY-MM-DD HH:MM:SS' format.' This is from mysql site. Problem: You’d like to get the current date and time for a MySQL database. Cast the datetime to a date, then GROUP BY using this syntax: SELECT SUM (foo), DATE (mydate) FROM atable GROUP BY DATE (atable.mydate) Or you can GROUP BY the alias as orlandu63 suggested: SELECT SUM (foo), DATE (mydate) DateOnly FROM atable GROUP BY DateOnly Though I don't think it'll make any difference to performance, it is a. This allows your retrieval to always be in UTC.īy default, the option is 'SYSTEM' which is how your system time zone is set (which may or may not be UTC!): mysql> SELECT | | To go along with comment that CURRENT_TIMESTAMP is stored as UTC but retrieved as the current timezone, you can affect your server's timezone setting with the -default_time_zone option for retrieval. SELECT CONVERT (DATETIME, '17-09-2010', 105) PostgreSQL: PostgreSQL provides TODATE and TOTIMESTAMP functions to convert a string in the specified format to DATE or TIMESTAMP. Utilizzare MySQL per la date e tempo, con approfondimenti sulle tipologie di campo e la gestione di Timestamp e il 'valore zero'.

Mysql datetime