Citizen AT8260-18A Instruction Manual page 49

Adjusting the time/calendar manually
◆
Month and year indications
December
48
The number of years and months since the leap year is
indicated by second marks.
January
February
Leap year
1st year
2nd year
3rd year
Leap year
1st year
2nd year
March
3rd year
[Month]
December: between 12:00 and 01:00
between 01:00 and 02:00
January:
February: between 02:00 and 03:00
[Year]
Leap year:
Hour marker in each month
1st year since leap year:
1st min. marker in each month
2nd year since leap year:
2nd min. marker in each month
3rd year since leap year:
3rd min. marker in each month