[ADMIN] How to set time zone permanently

[Pam Wampler]

How do you set the time zone permanently in postgresql?
I can use the set time zone 'EST'  in psql on template1 
show time zone & it shows EST
exit
then go back into psql & do a show time zone & it says time zone unknown

Where do I & how do I permanently set the time zone?

thanks
Pam Wamper

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