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**15 October 2018**** plus 60 days** will be

14th December 2018

For example

- What is 25 weeks before Today? (Today minus 25 weeks)
- What is 12 years before 5 August 2024? (5 August 2024 minus 12 years)
- What is 800 weeks before Yesterday? (Yesterday minus 800 weeks)
- What is 90 days before 24 June 2022? (24 June 2022 minus 90 days)
- What is 500 months from Tomorrow? (Tomorrow plus 500 months)
- What is 5 days before 20 March 2023? (20 March 2023 minus 5 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.