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**21 October 2018**** minus 120 days** will be

23rd June 2018

For example

- What is 5 years from Today? (Today plus 5 years)
- What is 180 weeks before 25 March 2023? (25 March 2023 minus 180 weeks)
- What is 15 days before Yesterday? (Yesterday minus 15 days)
- What is 900 years from 13 November 2021? (13 November 2021 plus 900 years)
- What is 200 days before Tomorrow? (Tomorrow minus 200 days)
- What is 20 days from 21 September 2021? (21 September 2021 plus 20 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.