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**12 December 2018**** minus 4 years** will be

12th December 2014

For example

- What is 15 days before Today? (Today minus 15 days)
- What is 50 years before 11 July 2023? (11 July 2023 minus 50 years)
- What is 400 years from Yesterday? (Yesterday plus 400 years)
- What is 1 year before 30 January 2023? (30 January 2023 minus 1 year)
- What is 730 weeks from Tomorrow? (Tomorrow plus 730 weeks)
- What is 400 years from 5 January 2021? (5 January 2021 plus 400 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.