Seiko 5R64 Instruction Manual page 7

<Date setting>
The watch displays the date from the 1st to 31st every month so that manual date
adjustment is only required on the first day after a month that has less than 31 days.
Example: To set the date on the morning of the 1st day of a month that
follows a non-31day month.
31
Normal position
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1. The date displayed will be "31" instead of "1."
Pull out the crown to the first click.
First click position
2. Turn the crown counterclockwise (the six
o'clock direction) to set the date to "1."
* Do not change the date while the watch
hands show any time between 9:00 PM
1
and 1:00 AM. Date setting during this
time period may prevent the date from
changing correctly on the following
day. To avoid this, pull out the crown to
the second click, and turn it counterclock-
wise (the six o'clock direction) to
temporarily set the hands to show any
time out of this time period. Then push
the crown back to the first click to set
the date.
3. After completing the date setting, push the
crown back in to the normal position.
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