Save timestamp in database

MySQL by default will use the system time zone internally but it's possible to define a different time zone
for the MySQL server globally or even per transaction. When you insert a date, it is not possible to define
the time zone along with the date string in MySQL. A date like '2013-11-10 00:00' refers to a point in time
since the epoch. You store it and you know what time zone your server is in. Then when you retrieve it, you
can make the necessary adjustments to transform that date form the server's time zone to the client's.

SEE: This MySQL Cheat Sheet

MySQL Timezone Cheatsheet

Thank you