I just gotta know

[LordRasta]

I have a Seiko Milemarker, nice watch but I rarely wear it anymore. Anyway it has one of those perpetual calendars on it, shows the date. My question....how the hell does the watch know if the month ends in 30 or 31? It even gets Feb. right. It bugs me because it is the only watch I don't have to fix the date on the 1st (unless the previous month ended in 31). There is no day or month on the watch, just the date.

[Watchmeister]

Not a thorough answer but the underlying movement is their standard quartz perpetual movement implying it could support all the functionality of a standard perpetual calendar. So once you can set the date, month and year you should be all set. The year is actually calculated based not on the actual year but on the date of the last leap year. Don't know if it answers your question. I have only seen a gen of this once and played with it very briefly. If I remember correctly you can actually see years from leap year with second hand and month through the calendar.

[LordRasta]

Ok that explains it, they calculate it from the last leap year. There is no year/month/day to set on the watch, just the day. Thanks for clearing it up.