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**20 October 2018**** plus 45 days** will be

4th December 2018

For example

- What is 20 years before Today? (Today minus 20 years)
- What is 400 years before 9 January 2025? (9 January 2025 minus 400 years)
- What is 11 days from Yesterday? (Yesterday plus 11 days)
- What is 12 days before 5 November 2020? (5 November 2020 minus 12 days)
- What is 60 weeks before Tomorrow? (Tomorrow minus 60 weeks)
- What is 2 years before 4 September 2021? (4 September 2021 minus 2 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.