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**13 January 2020**** minus 15 days** will be

29th December 2019

For example

- What is 25 years before Today? (Today minus 25 years)
- What is 8 days before 12 March 2024? (12 March 2024 minus 8 days)
- What is 60 months before Yesterday? (Yesterday minus 60 months)
- What is 180 days from 6 May 2021? (6 May 2021 plus 180 days)
- What is 900 months before Tomorrow? (Tomorrow minus 900 months)
- What is 300 days from 31 August 2021? (31 August 2021 plus 300 days)

The **Gregorian calendar** is the most widely used internationally civil calendar. It is named after Pope Gregory 13th, who introduced it in **October 1582**.

The Gregorian calendar is a **solar calendar**. A regular Gregorian year consists of 365 days, but as in the Julian calendar, in certain years, a leap year, a **leap day is added to February**

The months of **April, June, September, and November** have **30 days**, while the **rest have 31 days** except for **February**, which has **28 days** in a standard year, and **29 in a leap year**.

For best results, please use dates after 1752 and **verify any data** if you are doing genealogy research.