![]() In order to account for this, February is increased by 1 day to be 29 days. You can refer to the exact number of days on any calendar or on this page.īut there also exist a leap year whereby the number of days in a year is 366 days. To achieve this, the calendar divides the months into 30 & 31 days alternately though there are some exception here and there such as July and August that both have 31 days and February having 28 days. In a normal year, there are 365 days in a year divided into 12 months. Both calendars have the same problem: there is simply no easy rule regarding these calendars because the moon and earth does not revolve at an easy predetermined duration.įor the solar calendar, the current set of calendar that we use currently is called Gregorian calendar that after accounting for leap years, averages the year into 365.2425 days long – yes, it’s not exactly 365 days long hence the root cause of the problem at hand. There are two main types of calendar, lunar calendar (depends on moon’s revolution around earth) and the solar calendar (depends on the earth’s revolution around the sun), with the latter the most formally used nowadays. Throughout mankind’s history, our calendar have gone through many reforms and changes, along with advancement in astronomical knowledge as well as technology. Why The Number Of Days Are Not The Same In Every Month? For digital watches, most often than not the calendar is programmed inside the chip giving it the ability to display the correct date (much like our computer and phones). Thus, this irregularity in the number of days every month will give the hassle of having to change the date manually at least every 1/2 month (depending on what month you first set the watch).īut do note that this problem only exists with analog watches ( automatic or quartz movements). This default setting will just cycle the dates until 31 and then it will go to 1 – this kind of calendar is called simple calendar. This poses the problem as most normal watches with analog display uses a simple mechanical function to change the date display once 24 hours passed. There’s also the problem of leap years, whereby during that year the month of February will have 29 days instead of the typical 28. We’re thought from when we’re kids that every month comprises different number of days, either 30 days or 31 days in a month, with February being an exception with 28 days. Perpetual calendar watch has one additional function on top of the normal watch and that is to show the correct dates all year round on your wrist watch (but how important that is will depend entirely on individuals.) Perpetual Calendar Watch – Showing The Correct Dates All The Time On Your Wrist
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