GW-9100 How can I set the DST ? - Casio G-Shock GW500A-1V Wrist Watch

click the link below to download manual
http://support.casio.com/en/manual/manuallist.php?cid=009

You can find the information about setting DST on page 4 of the manual.

Hi ...



your watch supports Time Zones , Automatic time Updates, Automatic adjustments of DST.









First Verify Correct Home City Is Selected
1. In Time Keeping Mode (That is The Digital Display shows time and Day of week)



2. Press Button (A) long enough to country code start to flash on digital display.


3. Press Button (B) or Button (D) to change Country code to current one.
4. After Selecting Desired Country, Press button (A) TWICE.

Now Country Code will be saved on watch.

Supported Country codes are:-




To Activate DST (Daylight Saving Time).
1. In Time Keeping Mode (That is The Digital Display shows time and Day of week)


2. Press Button (A) long enough to Digital Display start to flash.

3. Press Button (C) TWICE to Display DST Settings.
4. Press Button (D) repeatly to cycle through three DST Options:-
A --> DST is set on Automatic Mode. If Your country uses DST, the watch will Adjust DST Accordingly.
OFF --> DST is set to disabled. No DST is applied to Main Time Settings
ON --> DST is Set to On. DST is applied even if your country doesnot follow DST.
5. Press Button (A) TWICE to save Selected Option.


Default values (Factory Settings) when you bought this watch is



This way you can set DST

From the main time display, hold down the adjust button until it beeps and your time zone is flashing on the bottom of the display. Then press the mode button once. [AUTO/ON/OFF] DST will be flashing on the bottom. Use the Time Memo and/or Receive buttons to cycle the mode. When it's what you want, press adjust twice.

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The MTG-900 supports automatic DST which can be activated in the time setting mode.  However, the ROM in the MTG-900 dates from before Congress (in their infinite ability to make mistakes) modified the DST schedule, so, instead of switching at the beginning of April and the end of October (as currently specified), it switches at the end of April and the beginning of October (as previously specified).
I do not believe that there is a way to change the DST scheduling or manually turn DST on or off.  I've resorted to changing the time zone manually and turning off the DST feature.  IOW, I set the timezone to Pacific (LAX) during PST, and, to Mountain (DEN) during PDT.

You posted this in January, which is not during daylight savings time. The SMT setting doesn't turn on automatic DST switching for a particular timezone; rather, it is a manual override to adjust timezones to DST when it is actually active. There is no automatic DST adjustment for this watch (according to their FAQ). Turn SMT to OF for all timezones during winter months, and ON for applicable timezones during SuMmer Time (SMT).

If DST is set to AUTO,time (DST ON-DST OFF) is corrected automatically when the watch is synchronized.
Synchronization period (Radiocontrol) from 00:00 until 06:00.
If you live in an area where atomic signal cannot be reached by the watch,you have to change DST-NORMAL and vv,manually,by going to WT (World Time) function and when your city (or the closest big one) appears on the display,press and keep pressed for 1-2sec the SET button.
DST mark will appear or disappear,accordingly.

You don't need to set the watch back an hour.  You just need to turn off the automatic DST adjustment.
Hold ADJUST for several seconds.  Then, when DEN starts flashing (or whatever timezone you are set to), hit MODE The display will change to DST flashing at the top and on or auto flashing at the bottom. Click TIME/MEMO or RECEIVE to change on->auto->off.  Once off is flashing at the bottom, hit ADJUST twice and you will be out of DST mode and everything should be fine.

I had the same problem following recent daylight savings time (DST) change. The watch has three DST mode settings (ON, OFF, and AUTO). You get to the setting mode by pressing and holding the "adjust' button until the city time zone indicator starts to flash. Then press the "mode" button. This should give you the DST setting. Now press the "receive" button to cycle through the ON, OFF, and AUTO modes for DST. I set it for AUTO. I then existed the setting mode by pressing "adjust" again.

Now you can initiate a manual update of the time by pressing and holding the receive button. Put your watch by a window and make sure the signal strength indication is showing level 4 (full picture of satellite dish on my version). Give it a few minutes to down load new time.

After doing this the watch corrected itself and now shows correct time. Other wise I assume you could set the DST function to ON or OFF as well depending on whether you need to add or subtract the hour from the time.