# Calculate Months

Calculator for the number of months before or after a certain month and year. As a start date, the current month is preset. This can be changed at will. Enter the number of months. It will be calculated from the start date, which month and year is this amount of months in the future and which is in the past.

Example: if you start from October and go 20 months into the future, then it is June and the year increases by two. Going 20 months into the past from October takes you to February, and the year decreases by one.

This calculator only works with the number of months, without taking their lengths into account, which fluctuate between 28 and 31. Therefore, no exact date with the number of the day is given here, because this would suggest an accuracy that this calculation does not have.

If, when calculating the future, i.e. "In ... months", the number of months added is greater than the number of months that are still left in the year, then the year increases according to the formula

If, when calculating the past, i.e. "... months ago", the number of months subtracted is greater than the number of months that the year has already reached, then the year is reduced according to the formula

The term month is derived from the moon; a month should correspond to the duration of the lunar phase cycle from new moon to new moon. However, this is 29.53 days and a year cannot be divided into this number without a remainder. A twelfth of a normal year would be 30.42 days, a twelfth of a leap year would be 30.5 days. Therefore, the months have different lengths to contain a whole number of days each and they are slightly longer than the lunar phase cycle. It can even happen that the same lunar phase, for example a full moon, occurs twice in one month.

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