Change to Pacific Time Zone

The freeze time remains the same when switching to PDT
(Daylight Saving Time), so it should be PT, not PST.

PROCESS.md

@@ -71,7 +71,7 @@ star, smile, etc.). Some good tips about code reviews can be found in our
 
 ## Feature freeze on the 7th for the release on the 22nd
 
-After 7th at 23:59 (Pacific Standard Time Zone) of each month, RC1 of the upcoming release (to be shipped on the 22nd) is created and deployed to GitLab.com and the stable branch for this release is frozen, which means master is no longer merged into it.
+After 7th at 23:59 (Pacific Time Zone) of each month, RC1 of the upcoming release (to be shipped on the 22nd) is created and deployed to GitLab.com and the stable branch for this release is frozen, which means master is no longer merged into it.
 Merge requests may still be merged into master during this period,
 but they will go into the _next_ release, unless they are manually cherry-picked into the stable branch.