HOW TO CALCULATE TIME ZONE FROM GIVEN LOCAL TIME

Very carefully with a very small hammer :>D

They just press onto the shaft. Take it to a local jeweler. No one has ever managed to lose the hands before!

https://www.google.com/search?q=Diesel+Big+Daddy+4+time+zone+watch+replace+hands

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Access watch settings scrolling by UP/Down button.
<Settings> <Ok> <Watch> <Time and Date Settings>

In Time Settings:
Set the local time (Time 1) and a time difference to it (Time 2).
With Time zone, you can select which time zone is used.
In Time view, you can easily change the time zone from Time 1 to Time 2 by pressing and holding DOWN.

Set the date with Date setting.

You can also download the user manual from the link below
http://www.polar.com/e_manuals/RS300X/Polar_RS300X_user_manual_English.pdf

dual time. You can set the inner hand with 24 hr markings for other time zone. So regular hands for your local time and inner hand for other country or time zone.

And what make and model was it ?

Sorry, a fixed bezel is for looks only. A movable bezel will allow you to calculate how many hours ahead or behind a certain time zone you are (although this type of bezel is mostly used for scuba divers). If your bezel won't rotate, it's there to look pretty.
I hope this helps! Please rate me with thumbs up if this helped you.

Some Renato anidigis are world timers tracking second times and time zones. On my Vulcan World timer for example, pressing the crown allows you to select and set a second city and time zone for the digital display while the analog dial continues to show the primary local time you entered when you did the initial setup. If you want both displays to show the same time, simply set the same city for both displays. To set the secondary digital display on mine, after pressing the crown, CITY would blink, and I would choose the same city and time zone again rather than let the indicator rest on a different one at random.

Time Setting Instructions:First press and hold ST/STP for a few seconds and make sure it says (Time 1). This watch has a (Time 2) to use in other time zones.You change from Time 1 and Time 2 by pushing the ST/STP button for a few seconds.Time 1 setting:- Press and hold the SET button (Light Function will blink) use the ST/STP button to select on or off. Then push the Mode button to go to the next function.- The Chime function will blink. Use the ST/STP button to select on or off and then push the Mode button to go to the next function.- Next will be to select 12hour or 24hour time by using the ST/STP button then press the Mode button to set the Hour, Minutes, and Seconds.- Continue to set the year but when you get to the Month/Day you have the option of putting the day first then the month, use the ST/STP to select then push the Mode button to enter the month and day.- When satisfied with your settings push the SET button and your done.
Time 2 Setting:- Press and hold the ST/STP button it will say Time 2 and then go away only showing the time and date for Time 2- To adjust this time to another time zone you push and hold the SET button.- Use the ST/STP button and the RESET button to move ahead or behind in hours depending on time zone. Push the SET button when done.-Your time 2 is set for a different time zone and your Time 1 is set for your local time. Remember to use the ST/STP button to go back and forth from Time 1 to Time 2.

If the time is "incorrect" i.e. not your local time, then it is set to another time zone.

To correct this press the "mode" button until you come to a display showing three letters. These are city abbreviations and you may have to guess which one you need.

Some experimenting will be required, good luck!

You may find the info here:

http://world.casio.com/wat/download/en/manual/