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**21 October 2018**** minus 180 days** will be

24th April 2018

For example

- What is 13 days before Today? (Today minus 13 days)
- What is 9 months from 27 March 2025? (27 March 2025 plus 9 months)
- What is 30 months from Yesterday? (Yesterday plus 30 months)
- What is 150 days before 29 December 2024? (29 December 2024 minus 150 days)
- What is 800 days from Tomorrow? (Tomorrow plus 800 days)
- What is 3 days from 29 April 2019? (29 April 2019 plus 3 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.