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**21 October 2018**** minus 75 days** will be

7th August 2018

For example

- What is 25 days before Today? (Today minus 25 days)
- What is 900 months before 12 June 2025? (12 June 2025 minus 900 months)
- What is 800 years before Yesterday? (Yesterday minus 800 years)
- What is 30 years before 22 March 2023? (22 March 2023 minus 30 years)
- What is 500 years before Tomorrow? (Tomorrow minus 500 years)
- What is 11 months from 1 July 2021? (1 July 2021 plus 11 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.