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**16 October 2018**** minus 45 days** will be

1st September 2018

For example

- What is 6 months before Today? (Today minus 6 months)
- What is 21 years before 24 March 2020? (24 March 2020 minus 21 years)
- What is 100 months before Yesterday? (Yesterday minus 100 months)
- What is 7 years before 6 October 2023? (6 October 2023 minus 7 years)
- What is 15 years from Tomorrow? (Tomorrow plus 15 years)
- What is 30 days from 22 June 2024? (22 June 2024 plus 30 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.