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**16 October 2018**** minus 180 days** will be

19th April 2018

For example

- What is 90 weeks before Today? (Today minus 90 weeks)
- What is 3 months from 15 January 2021? (15 January 2021 plus 3 months)
- What is 5 days from Yesterday? (Yesterday plus 5 days)
- What is 600 days from 23 February 2025? (23 February 2025 plus 600 days)
- What is 1 day from Tomorrow? (Tomorrow plus 1 day)
- What is 1 day before 6 August 2023? (6 August 2023 minus 1 day)

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.