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How to auto-adjust time by users' timezone ?


terryds
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Most systems give the user a dropdown with a list of time zones to choose from. The settings for the user are saved in a database. When the user is logged in, the user's settings are loaded from the database. Dates on the pages are shown in the user's timezone using methods such as DateTime::setTimeZone()

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Fox,

 

What would be the best route to take if you try to adjust the time to the users local time without asking them for their timezone etc? I understand using the browser via Javascript is not a good idea because their clock on the computer can be wrong but getting their timezone at least via Javascript can be an option to take because from there you can calculate what the correct time is for them using the timezone supplied from Javascript and the server time?

 

Apologies if this is hijacking the thread. If so, this post can be deleted.

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That's not something most websites do. If you log out of the forum now you'll see that the post times are shown in UTC time.

 

If you want to figure out a user's time offset you can try Geolocation or have Javascript send their local time so you can compare it to the server's time. You can check the offset in hours between the the client and the server and add that to the dates before showing them. Some time zones have half-hour offsets, so you would probably have to take that into account as well.

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Most systems give the user a dropdown with a list of time zones to choose from. The settings for the user are saved in a database. When the user is logged in, the user's settings are loaded from the database. Dates on the pages are shown in the user's timezone using methods such as DateTime::setTimeZone()

 

That's not something most websites do. If you log out of the forum now you'll see that the post times are shown in UTC time.

 

If you want to figure out a user's time offset you can try Geolocation or have Javascript send their local time so you can compare it to the server's time. You can check the offset in hours between the the client and the server and add that to the dates before showing them. Some time zones have half-hour offsets, so you would probably have to take that into account as well.

 

Thanks for your answer :)

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That's not something most websites do. If you log out of the forum now you'll see that the post times are shown in UTC time.

 

 

I see, but many sites like Facebook for example adjust the time for their users to the users' local time without asking them for their timezone etc.

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They ask the users for their location, I presume. I'm not on Facebook so I don't know. They can figure out the timezone from the geographical location. That would require a large database of locations and associated time zones.

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