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**Today **(23 August 2019)** minus 1 day** will be

22nd August 2019

For example

- What is 800 years before Today? (Today minus 800 years)
- What is 200 weeks before 6 October 2019? (6 October 2019 minus 200 weeks)
- What is 14 days from Yesterday? (Yesterday plus 14 days)
- What is 14 weeks from 5 September 2024? (5 September 2024 plus 14 weeks)
- What is 100 weeks before Tomorrow? (Tomorrow minus 100 weeks)
- What is 900 years before 11 March 2025? (11 March 2025 minus 900 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.