Calculating time difference between 2 dates in min

问题:

I have a field of time Timestamp in my MySQL database which is mapped to a DATE datatype in my bean. Now I want a query by which I can fetch all records in the database for which the difference between the current timestamp and the one stored in the database is > 20 minutes.

How can I do it?

What i want is:

SELECT * FROM MyTab T WHERE T.runTime - now > 20 minutes

Are there any MySQL functions for this, or any way to do this in SQL?

回答1:

I think you could use TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) something like

select * from MyTab T where
TIMESTAMPDIFF(MINUTE,T.runTime,NOW()) > 20

回答2:

ROUND(time_to_sec((TIMEDIFF(NOW(), "2015-06-10 20:15:00"))) / 60);

回答3:

Try this one:

select * from MyTab T where date_add(T.runTime, INTERVAL 20 MINUTE) < NOW()

NOTE: this should work if you're using MySQL DateTime format. If you're using Unix Timestamp (integer), then it would be even easier:

select * from MyTab T where UNIX_TIMESTAMP() - T.runTime > 20*60

UNIX_TIMESTAMP() function returns you current unix timestamp.

回答4:

I am using below code for today and database date.

(TIMESTAMPDIFF(MINUTE,NOW(),EndDate))%60 as Minutes

Here we can use HOUR(for hours - %24), DAY(for days - no need of %) in place of MINUTE if we need.