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**20 October 2018**** minus 100 days** will be

12th July 2018

For example

- What is 365 years before Today? (Today minus 365 years)
- What is 20 days before 27 February 2023? (27 February 2023 minus 20 days)
- What is 800 months from Yesterday? (Yesterday plus 800 months)
- What is 12 years before 14 August 2025? (14 August 2025 minus 12 years)
- What is 9 days from Tomorrow? (Tomorrow plus 9 days)
- What is 9 months from 23 March 2024? (23 March 2024 plus 9 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.