Excel 2010: Working with Dates and Times
Illustration by Neil Webb

Calculating date differences across days, months, and years


From:

Excel 2010: Working with Dates and Times

with Dennis Taylor

Video: Calculating date differences across days, months, and years

Calculating days elapsed between two dates or calculating days into the future is generally pretty straightforward in Excel. Counting dates elapsed is a simple subtraction. Equal the later date. The example here, B2 minus the earlier date. How many days have passed? The unit of time is one equal day. If we come up with an answer like this, simply format it. A couple of ways. Ctrl+Shift+Tilde is one way. You can also on the Home tab use the comma button if you wish.
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  1. 1m 33s
    1. Welcome
      1m 13s
    2. Using the exercise files
      20s
  2. 5m 29s
    1. Understanding how Excel records and stores dates
      3m 56s
    2. Understanding how Excel records and stores times
      1m 33s
  3. 12m 59s
    1. Looking at standard date/time entry options and acceptable alternatives
      2m 51s
    2. Using instant date/time entry
      1m 27s
    3. Using the TODAY and NOW functions for dynamic date/time entry
      3m 4s
    4. Using Auto Fill to enter date and time series
      5m 37s
  4. 6m 17s
    1. Exploring keystroke shortcuts
      1m 45s
    2. Formatting time for hours over 24
      2m 16s
    3. Creating custom date formatting
      2m 16s
  5. 17m 45s
    1. EOMONTH and EDATE: Calculating ends of months and future/past dates
      4m 30s
    2. DATEDIF: Calculating date differences by year, month, day, and more
      4m 17s
    3. WEEKDAY: Determining the day of the week
      1m 49s
    4. NETWORKDAYS: Calculating working days
      2m 26s
    5. WORKDAY: Calculating ending dates
      1m 56s
    6. DATEVALUE and TIMEVALUE: Converting text entries into dates and times
      2m 47s
  6. 21m 9s
    1. Calculating date differences across days, months, and years
      1m 45s
    2. Calculating time differences within and across days
      4m 56s
    3. Calculating fiscal years and quarters
      5m 24s
    4. Rounding time calculations to convenient intervals
      4m 42s
    5. Using times with currency calculations
      2m 44s
    6. Calculating holidays (Labor Day, Thanksgiving, Memorial Day, etc.)
      1m 38s
  7. 15m 18s
    1. Using special date filters with date data
      3m 27s
    2. Using date controls in data validation rules
      5m 41s
    3. Using date functions in data validation rules
      3m 7s
    4. Converting unusually formatted dates into usable data (text to columns)
      3m 3s
  8. 18s
    1. Goodbye
      18s

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Watch the Online Video Course Excel 2010: Working with Dates and Times
1h 20m Intermediate Jul 28, 2010

Viewers: in countries Watching now:

In Excel 2010: Working with Dates and Times, Dennis Taylor shares his solutions for optimizing the use of dates and times in Excel 2010. This course explains what's going on behind the scenes when Excel stores dates and times, gives tips for entering dates and times, and shows options for date and time formatting. It also demonstrates the various date and time functions and shows how to calculate with dates and times in a range of scenarios. Exercise files are included with the course.

Topics include:
  • Understanding how Excel records and stores dates and times
  • Looking at standard date/time entry options and acceptable alternatives
  • Using the TODAY and NOW functions
  • Customizing date formats
  • Exploring keyboard shortcuts
  • Formatting time for hours over 24
  • Calculating differences across dates and times
  • Rounding calculations
  • Working with holidays
  • Validating with dates
  • Converting formatted dates to usable data
Subject:
Business
Software:
Excel
Author:
Dennis Taylor

Calculating date differences across days, months, and years

Calculating days elapsed between two dates or calculating days into the future is generally pretty straightforward in Excel. Counting dates elapsed is a simple subtraction. Equal the later date. The example here, B2 minus the earlier date. How many days have passed? The unit of time is one equal day. If we come up with an answer like this, simply format it. A couple of ways. Ctrl+Shift+Tilde is one way. You can also on the Home tab use the comma button if you wish.

This does introduce decimals however. You can hide those if you wish. So a couple of different ways to quickly format this. Of course, by double-clicking here we could copy these down the column. Here and there, we see sometimes we're within the same year. This crosses yearly boundaries with no difficulty whatsoever, and of course century boundaries as well. It's an accurate count to the day, how many days between these two days. Sometimes we need to look into the future. In the example here, we want to know 90 days from this date. That's the Review Date.

So, equal a given date plus 90, and we see the answer there. Double-click to copy these down the column. By the way, in this situation, if you did want to make sure that the review dates were working days, as these starting dates might have been. Let's assume that the starting dates are Mondays through Fridays. We'd be better off calling this a 91 days review, since that's exactly 13 weeks. That will change a little bit. So simply by editing these and making that be 91 we'd make sure that these are all within that Monday to Friday timeframe, if our start dates are within that frame as well.

So I make changes here. So that's a 91-day difference. Fast and easy to use in Excel.

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