i saved SERVER time manually for specific options... i want them to convert to user-specific time for site (the time that is set in GENERAL OPTIONS).
for example, i want 141234567890 to be converted in like this: 13:25:57 20-05-2016
the_date and such functions are only for post...
The correct function to use for what you describe would be date_i18n() WordPress function.
It will produce output that is correct for timezone configured in WordPress and also localized if necessary.
found WP built-in function get_date_from_gmt :
get_date_from_gmt('13:49:18 26/05/2016')
or
get_date_from_gmt(strtotime('13:49:18 26/05/2016'))
