Timezones.
Server time then local time.
If it's only shifting five hours, you must be in EST.
Active thread is already in memory.
Active thread didn't have 751+ posts and images to sort and load when you clicked fresh bread and wanted it bounced back and forth around the planet several times, did it?
Just trust that the computer knows how to do its job correctly and bring you your beloved bread.
Any sufficiently advanced technology is indistinguishable from magic.
-Arthur C. Clarke
Or, you could just let a page load completely and let the underlying source code do what it was written to do…
Converting between remote server time and your local time is one of those jobs.
Honestly, you seem to be trying to solve a problem that isn't really a problem… :/