Seiko D-1 Instructions Manual page 27

Date setting
（Do not set date/day of the week between 9:00 PM and 1:00 AM）
Pull out the Turn the crown to
crown to the set the date
first click.
SUN
For models with a screw lock type crown, always screw the crown up again after setting the time
Note
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Push the crown
back in to its
normal position.
MON
When date adjustment is required
The date makes one round in a 31- day period.
It is necessary to adjust the date at the end of the
month following a month that has less than 31 days.
Note
Time period that is not good for setting the date
Between 9:00 PM and 1:00 AM
(The date may not change.)
When date changes during daytime
It happens when AM/PM is wrongly set.
Advance the hour hand by twelve hours.
(Refer to "Time Setting".)
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