How to change the day on a casio F-200 - Casio Watches

Even much older watches that display day and date don't require you to change yourself manually so I can't imagine this would be the case.
If the time part is working okay, bring to the jewellery store, they may have someone there to examine the mechanism. If time not working either, you probably need to wind it or change the battery

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

go to link below
http://support.casio.com/storage/en/manual/pdf/EN/009/qw2672.pdf

First of all avoid setting the day and day of the week between 9.00 pm and 6.00 am. The day and day of the week may not change in the following day if you do.
Try this,
1) Pull the crown to the first click.
2) Set the day by rotating the crown counterclockwise.
3) Set the day of the week by rotating the crown clockwise.
4) Push the crown back to its normal position.

Hope this will help.
Cheers

follow these instructions off the manual below if you set the watch in wrong sequens it wont change at 12 oclock
http://support.casio.com/en/manual/009/qw5125.pdfhttp://support.casio.com/en/manual/009/qw5125.pdf

INSTRUCTIONS > http://ftp.casio.co.jp/pub/world_manual/wat/en/qw2515.pdf

On most digital watches, if you properly set the date and year, the day of the week is preset.

An example for G-shock: I searched for casio g-shock manual and got this: http://world.casio.com/wat/download/en/manual/

You enter model from back of watch and it gives you a searchable PDF manual.

For mine, model 2638 (and likely most G-shocks), you press and hold the upper left (Adjust) button until the City Code flashes. You then press the lower left (Mode) to enter DST mode then press the lower right (Receive) as it cycles through On, Off and Auto.
On moves 1 hour forward, Off moves 1 hour back. After you select, you press the upper left button (Adjust) twice and it's set. I would not pick Auto anymore as my watch is still set to the original DST days which were changed in the US years ago and no longer match, I don't believe the DST days used can be changed by the user and I don't believe Auto receive adjusts for DST.

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

you can get
instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box