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**Yesterday **(16 July 2019)** minus 900 days** will be

27th January 2017

For example

- What is 2 years from Today? (Today plus 2 years)
- What is 21 weeks from 12 January 2022? (12 January 2022 plus 21 weeks)
- What is 21 months from Yesterday? (Yesterday plus 21 months)
- What is 6 months before 8 January 2020? (8 January 2020 minus 6 months)
- What is 90 years before Tomorrow? (Tomorrow minus 90 years)
- What is 20 months before 9 January 2022? (9 January 2022 minus 20 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.