##
**Yesterday **(13 November 2019)** minus 40 days** will be

4th October 2019

For example

- What is 6 weeks before Today? (Today minus 6 weeks)
- What is 60 days from 27 November 2020? (27 November 2020 plus 60 days)
- What is 2 days before Yesterday? (Yesterday minus 2 days)
- What is 730 years before 25 December 2020? (25 December 2020 minus 730 years)
- What is 90 years before Tomorrow? (Tomorrow minus 90 years)
- What is 40 days from 22 March 2025? (22 March 2025 plus 40 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.