仅适用于日期而非时间时的PHP / MySQL时区

Question

My question is more on the concept side.

I'm wondering how to deal with dates only based information. For example, when you have a day to take a vacation or something like that on February 24th and you store on the database as 2015-02-24 00:00:00 right.... how do I deal with conversions in this case?

I already now how to convert timezones, it works with no problem in cases where the user selects a time too. But when I use 00:00:00 in cases only the date matters I'm having problems to figure it out.

For example: Let's say I setup my vacation to be on the 24th of February and I'm on EST right, and the system is saving all times on EST. It will convert and it will be saved as 2015-02-24 00:00:00

Then somebody on PST time will check it out, and when it convert to them it will be 2015-02-23 21:00:00 ... and it will show my vacation in their point of you it will be on the 23rd.

Is that a correct logic? How should I save on the database the time in that case? Keep it as 00:00:00?

I hope I was able to explain myself.

Thanks

Answer 1

You can save the date in unix timestamp in the database (always save the current time in GMT even if you are in EST).

And when displaying the date, convert it to the user's timezone.