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

18th April 2018

For example

- What is 40 weeks from Today? (Today plus 40 weeks)
- What is 1 year before 23 June 2022? (23 June 2022 minus 1 year)
- What is 365 months before Yesterday? (Yesterday minus 365 months)
- What is 700 weeks before 8 September 2020? (8 September 2020 minus 700 weeks)
- What is 600 days from Tomorrow? (Tomorrow plus 600 days)
- What is 600 years before 15 January 2020? (15 January 2020 minus 600 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.