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**Yesterday **(17 June 2019)** plus 90 days** will be

15th September 2019

For example

- What is 11 days before Today? (Today minus 11 days)
- What is 20 years before 5 July 2019? (5 July 2019 minus 20 years)
- What is 1 month before Yesterday? (Yesterday minus 1 month)
- What is 30 days before 12 December 2024? (12 December 2024 minus 30 days)
- What is 100 days from Tomorrow? (Tomorrow plus 100 days)
- What is 4 months before 20 October 2021? (20 October 2021 minus 4 months)

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.