Timezone error in system.date.format

Using Ignition 7.9.10 here and I am having issues with the system.date.format function.
I am using the Singapore time zone SGT.
Printing in ISO8691 format gives me no issue showing +08:00 but trying to print the general time zone gives me SRET which is +11:00 . Is there some off by 1 bug going on here?