Chamorro Standard Time (new US time zone)

Paul Eggert eggert at
Mon Jan 8 23:50:41 UTC 2001

> Date: Mon, 08 Jan 2001 23:33:41 -0800
> From: Rives McDow <rmcdow at>

> Congress just added Guam and the Northern Marianas to the Uniform Time Act
> and is calling the time zone, "Chomorro standard time"  (This is spelled
> differently in various sources, and I'm not sure of the final correct
> spelling.)

Thanks for the heads-up.  The Congressional Delegate from Guam,
Congressman Robert A. Underwood, issued a press release
(2000-12-27) saying:

* President Clinton signed it into law on 2000-12-23.
* It's called "Chamorro Standard Time".
* The Congressman will seek the use of "ChST" for Chamorro Standard Time,
  as "CST" is taken. says that H.R. 3756 became Public Law Number 106-564 on
that day.  The Government Printing Office does not yet have that law
available, but H.R. 3756 did not specify an effective date, so I
assume that the change was effective when it was signed into law, and
unless we get better info I'll include it that way in my next proposed

I'm pretty sure that "Chamorro" is right -- at any rate, that's the
official name of the zone in H.R. 3756, regardless of how other people
might spell the word.

This will be the first time zone abbreviation in our database that has
a lower-case letter.  POSIX allows this, so I guess it's OK.

More information about the tz mailing list