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**Yesterday **(18 October 2019)** plus 6 days** will be

24th October 2019

For example

- What is 15 weeks from Today? (Today plus 15 weeks)
- What is 100 weeks before 22 October 2021? (22 October 2021 minus 100 weeks)
- What is 5 days before Yesterday? (Yesterday minus 5 days)
- What is 21 days before 15 March 2022? (15 March 2022 minus 21 days)
- What is 21 days before Tomorrow? (Tomorrow minus 21 days)
- What is 28 years before 11 September 2024? (11 September 2024 minus 28 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.