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**13 January 2020**** minus 7 days** will be

6th January 2020

For example

- What is 180 years before Today? (Today minus 180 years)
- What is 11 years before 6 June 2021? (6 June 2021 minus 11 years)
- What is 14 days before Yesterday? (Yesterday minus 14 days)
- What is 500 weeks from 5 March 2021? (5 March 2021 plus 500 weeks)
- What is 800 years from Tomorrow? (Tomorrow plus 800 years)
- What is 14 months before 12 August 2021? (12 August 2021 minus 14 months)

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.