TIMEZONE TIZ TZ

Description:

   Show or change the Timezone and Daylight Savings.

Form:

  Command Handler: SYSD
  TIMEZONE|TIZ|TZ stdoffset[dst]
  Arguments:
     std     Name of the TimeZone
     offset  Hours offset from UTC
     dst     Daylight Savings Setting.
  No Argument:  Shows current setting.

Response:

  Command to set TimeZone:
  *.SYSD TIMEZONE EST05<enter>
     Response is: OK\r\n
                 \r\n
  Command to show timezone:
  *.SYSD TIMEZONE<enter>
     Response is: OK\r\n
                 EDT05\r\n
                 \r\n

Notes:

Setting Timezone and Daylight Savings.

  This format combines the Timezone and Daylight savings time into a single setting.
  The argument to TIMEZONE has three sections: [std] offset [Daylight savings rule]

Std and Daylight saving rule are optional.

  The std string specifies the name of the time zone. It must be two or more characters
  long and must not contain a leading colon, embedded digits, commas, nor plus and
  minus signs. There is no space character separating the time zone name from the offset,
  so these restrictions are necessary to parse the specification correctly.  The offset
  specifies the time value you must subtract from Coordinated Universal Time value. It
  has syntax like [+|-]hh[:mm[:ss]]. This is negative if the local time zone is west of
  the Prime Meridian and positive if it is east.  To simply use the offset, the argument
  could be just "-5".  If you wanted to provide a label for the offset the argument without
  any Daylight Saving Time alternative is "EST-5".

Format to add Daylight Saving Time:
     std offset dst [offset],start[/time],end[/time]

  The initial std and offset specify the standard time zone, as described above. The dst
  string and offset specify the name and offset for the corresponding Daylight Saving Time
  zone; if the offset is omitted, it defaults to one hour ahead of standard time.  The
  remainder of the specification describes when Daylight Saving Time is in effect. The start
  field is when Daylight Saving Time goes into effect and the end field is when the change
  is made back to standard time.

Start/end: Mm.w.d
  This specifies day d of week w of month m. The day d must be between 0 (Sunday) and 6.
  The week w must be between 1 and 5; week 1 is the first week in which day d occurs, and
  week 5 specifies the last d day in the month. The month m should be between 1 and 12.
  The time fields specify when, in the local time currently in effect, the change to the
  other time occurs. For example, here is how you would specify the Eastern time zone in
  the United States, including the appropriate Daylight Saving Time and its dates of
  applicability. The normal offset from UTC is -5 hours; since this is west of the prime
  meridian, the sign is negative. Summer time begins on the first Sunday in April at 2:00am,
  and ends on the last Sunday in October at 2:00am:

    EST-5EDT,M4.1.0/2,M10.5.0/2

In 2007, the times for changing Daylight savings time in the US changed to:

    EST-5EDT,M3.2.0/2,M11.1.0/2