hello,
how could i create a timestamp or time_of_posting column in my site such that there is no sync problem bw server time and visitor's time...

also that column will be used for finding if diff bw time_of_posting and current time is >11months and less than 12 months

Use UTC. You still have to convert from local to UTC and back where required.

is unixtimestamp() ok for this thing??

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