It’s the 1st of the month and your Seiko proudly shows 31. It’s not broken. Most watches have a 31-day date wheel and no idea how long each month is.
Months that need a fix
| Month | Days | What to do on the 1st of next month |
|---|---|---|
| February | 28 (29 in a leap year) | Move on 3 days (2 in a leap year) |
| April | 30 | Move on 1 day |
| June | 30 | Move on 1 day |
| September | 30 | Move on 1 day |
| November | 30 | Move on 1 day |
How to do it on a Seiko 4R36
- Make sure it is not between 9 pm and 4 am. Seiko says not to set the date then.
- Unscrew the crown if needed and pull it to the first click.
- Turn counterclockwise until the date shows 1.
- Push the crown back in and screw it down.
Full setting guide: how to set the day and date on a Seiko. Watch has no quickset? On many older watches you advance the hands through 24 hours per day instead; take your time.
Frequently asked questions
Why does my Seiko show the 31st on the 1st?
The date wheel always has 31 days. In months with fewer days, you need to move it on by hand.
Which months need a correction?
February, April, June, September and November.
How do I correct it?
On a 4R36, pull the crown to the first click, turn it counterclockwise to the 1st, and push it back in, outside 9 pm to 4 am.
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