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: hit the ones with 30 and 31 days
: respectively (taking into account the 4-year
: adjustment for leap year).
There are four 30 day-long months unevenly spaced throughout the year. As the old rhyme goes, "Thirty days hath September, April, June and November...". That plus the variable number of days in February depending on the year with century exceptions are difficult for a mechanical mechanism to track.
A conventional calendar watch is mechanically very simple--it takes the elementary approach that ALL months are 31 days. Five times a year, you have to manually roll the date forward to correct for this.
The "perpetual calendar" watches that do handle this are much more cumbersome to set. They have to understand not only the day but also the month and the year. Making a mechanism that can not only do that but can be changed and reset when needed is pretty intricate. Since it is FAR simpler to merely correct the date five times a year, few manufacturers bother to add the expense of such a feature to their watches.
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