php - How to implement time ago like facebook -

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can explain me concept of implementing time ago facebook in php. dont want code. want know flow database field type, whether use utc time stamp , convert local time. thanks

it users location. if have users @ single timezone, no need of conversion. if users @ different time zones, require conversion.

in second scenario, covert , save time in db utc, according each user location, convert time during fetch.


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