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**20 April 2021**** minus 6 days** will be

14th April 2021

For example

- What is 12 days before Today? (Today minus 12 days)
- What is 100 years before 19 December 2023? (19 December 2023 minus 100 years)
- What is 1 month before Yesterday? (Yesterday minus 1 month)
- What is 12 years from 17 July 2020? (17 July 2020 plus 12 years)
- What is 21 weeks from Tomorrow? (Tomorrow plus 21 weeks)
- What is 300 years before 11 October 2022? (11 October 2022 minus 300 years)

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.