Convert Date to Milliseconds in MySQL

问题

I am trying to convert a date in MySQL to milliseconds. This is what I have to get the date:

DATE_ADD(mydate, INTERVAL(1-DAYOFWEEK(mydate)) DAY)

But that returns me like 15/02/2015 and I want to get the milliseconds of that date.

回答1:

Use the UNIX_TIMESTAMP function.

SELECT (UNIX_TIMESTAMP(mydate)*1000) FROM...

UNIX_TIMESTAMP will get you seconds and you need to multiply by 1000 to get milliseconds.

To convert back, use FROM_UNIXTIME() function.

SELECT FROM_UNIXTIME(date_in_milliseconds/1000) FROM ...

Again, you need to divide by 1000 to get it to seconds before using the function.

来源：https://stackoverflow.com/questions/28563195/convert-date-to-milliseconds-in-mysql