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## 1 Day Before January 1, 2010

Want to figure out the date that is exactly one day before Jan 1, 2010 without counting?

Your starting date is January 1, 2010 so that means that 1 day earlier would be December 31, 2009.

You can check this by using the date difference calculator to measure the number of days before Dec 31, 2009 to Jan 1, 2010.

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December 2009
• Sunday
• Monday
• Tuesday
• Wednesday
• Thursday
• Friday
• Saturday
1. 1
2. 2
3. 3
4. 4
5. 5
1. 6
2. 7
3. 8
4. 9
5. 10
6. 11
7. 12
1. 13
2. 14
3. 15
4. 16
5. 17
6. 18
7. 19
1. 20
2. 21
3. 22
4. 23
5. 24
6. 25
7. 26
1. 27
2. 28
3. 29
4. 30
5. 31

December 31, 2009 is a Thursday. It is the 365th day of the year, and in the 53rd week of the year (assuming each week starts on a Sunday), or the 4th quarter of the year. There are 31 days in this month. 2009 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 12/31/2009, and almost everywhere else in the world it's 31/12/2009.

### What if you only counted weekdays?

In some cases, you might want to skip weekends and count only the weekdays. This could be useful if you know you have a deadline based on a certain number of business days. If you are trying to see what day falls on the exact date difference of 1 weekday before Jan 1, 2010, you can count up each day skipping Saturdays and Sundays.

Start your calculation with Jan 1, 2010, which falls on a Friday. Counting forward, the next day would be a Monday.

To get exactly one weekday before Jan 1, 2010, you actually need to count 1 total day (including weekend days). That means that 1 weekday before Jan 1, 2010 would be December 31, 2009.

If you're counting business days, don't forget to adjust this date for any holidays.

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December 2009
• Sunday
• Monday
• Tuesday
• Wednesday
• Thursday
• Friday
• Saturday
1. 1
2. 2
3. 3
4. 4
5. 5
1. 6
2. 7
3. 8
4. 9
5. 10
6. 11
7. 12
1. 13
2. 14
3. 15
4. 16
5. 17
6. 18
7. 19
1. 20
2. 21
3. 22
4. 23
5. 24
6. 25
7. 26
1. 27
2. 28
3. 29
4. 30
5. 31

December 31, 2009 is a Thursday. It is the 365th day of the year, and in the 365th week of the year (assuming each week starts on a Sunday), or the 4th quarter of the year. There are 31 days in this month. 2009 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 12/31/2009, and almost everywhere else in the world it's 31/12/2009.

### Enter the number of days and the exact date

Type in the number of days and the exact date to calculate from. If you want to find a previous date, you can enter a negative number to figure out the number of days before the specified date.

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### Days before date calculator

This site provides an online Days Before Date Calculator to help you find the date that occurs exactly X days from a specific date. You can also enter a negative number to find out when X days before that date happened to fall. You can use this tool to figure out a deadline if you have a certain number of days remaining. Or read the full page to learn more about the due date if you're counting business days or weekdays only, skipping Saturday and Sunday. If you're trying to measure the number of days between two dates, you can switch to the Date Difference Calculator instead.

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