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**20 October 2018**** minus 80 days** will be

1st August 2018

For example

- What is 600 days from Today? (Today plus 600 days)
- What is 30 years from 24 April 2021? (24 April 2021 plus 30 years)
- What is 180 days before Yesterday? (Yesterday minus 180 days)
- What is 15 months from 11 February 2022? (11 February 2022 plus 15 months)
- What is 300 months from Tomorrow? (Tomorrow plus 300 months)
- What is 14 years before 3 May 2025? (3 May 2025 minus 14 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.