This is because there are a different number of days in each month, so we need to define what 1 month is in the context of the calculator. In contrast to years and days, there are two ways to consider adding or subtracting months. ![]() This is because the month of February 2020 was already passed (so there is no longer an extra day to account for), and 2021 is not a leap year. On the other hand, if we then add another 365 days to March 25 th, 2020, the date will be March 25 th, 2021. For example, 2020 was a leap year, so if we add 365 days (1 year) to March 26 th 2019, the date will be March 25 th 2020 since there is an extra day in February 2022. Adding and subtracting days can get more complicated if the number of days being added spans a leap year. This is the basis for calculating the number of days. Thus, 17 days after March 26 th will be April 12 th. Then, if we want to add 17 days to March 26, we know that there are 5 days left, so subtract 5 from 17 to find out what day of the month it will be in the month of April: For example, if the starting date is March 26: When adding days, determine the number of days left in the starting month. Similarly, adding a given number of days is relatively straightforward as long as you know the number of days in each month. For example, if the year is 1905 and 27 years are added to that: Adding years to a date is straightforward simply add the number of years to the starting year. Adding and subtracting datesĪdding and subtracting from a date takes all of the above into account. This calculator takes leap years into account. Leap years occur on years that are an integer multiple of 4, with the exception of years that are evenly divisible by 100 but not 400. Leap years are years that contain one additional day that occurs in February they occur in order to keep the calendar synchronized with the solar year, since a common year has 365 days, but a solar year has 365.24219 days. A solar year is comprised of 365.24219 days that are broken up into 12 months, each of which have 28-31 days: Month This is the basis of the measurement of time that most people are accustomed to. The time that it takes the Sun to return to the same position in the sky (such as above Earth), is referred to as a solar year. ![]() Solar calendars, like the Gregorian calendar, are based on the position of the Sun relative to the stars observed from the Earth. For this reason, this Date Calculator only measures time using the Gregorian calendar system. Other calendar types may be used to determine when certain holidays such as Chinese New Year, Ramadan, Rosh Hashanah, and Easter occur, but few other countries use any other calendar type as the official means of measuring the time and date. While some countries may use other types of calendars alongside the Gregorian calendar, such as the Chinese lunar calendar, most use the Gregorian calendar as the primary means for measuring official times. The Gregorian calendar is the most widely used calendar in the world. ![]() This calculator uses the Gregorian calendar, which is a type of solar calendar. Generally, there are two main types of calendar systems: a solar calendar and a lunar calendar. The measurement of the date is dependent on the calendar used. In cases where daylight saving time might be relevant, the calculator will provide an alternate time based on whether daylight saving time is in effect. This date calculator can be used to add to or subtract from a date or time.
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