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Understanding how Excel records and stores times


From:

Excel 2010: Working with Dates and Times

with Dennis Taylor

Video: Understanding how Excel records and stores times

In this worksheet in Column D, times have been recorded for the time of the sale, time of day. Times in Excel are based on the date system. The unit of measure between dates is 1, but how does time play out here? It's not so obvious. Times as with dates considered values. If we type in a time 5:00, for example, 5 AM, we actually have stored here a value, the same way the dates are values or times. 5 o'clock represents a certain portion of the day. It's 5/24ths.
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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

Understanding how Excel records and stores times

In this worksheet in Column D, times have been recorded for the time of the sale, time of day. Times in Excel are based on the date system. The unit of measure between dates is 1, but how does time play out here? It's not so obvious. Times as with dates considered values. If we type in a time 5:00, for example, 5 AM, we actually have stored here a value, the same way the dates are values or times. 5 o'clock represents a certain portion of the day. It's 5/24ths.

What if it were 6 AM? We would type 6:00. That's one-fourth of a day. Rarely do we need to see what the value is, but if you happened to click the comma in the Home tab, this is one quick way to get there. You will see that's the actual value being stored, one quarter. Most of the time you are not thinking about this. It does explain how we can subtract times from one another and how we can add values to time entries. So rarely do we actually need to click this button to see what the value is.

Just remember that when you do enter times into a worksheet, or when you are dealing with times, you are dealing with values and they represent a portion of the day. 12 noon is .5, 6 PM would be .75. You will see later different ways to enter the day, but certainly you could enter it this way, and that value there is .75, again a quick look. There we go! Times are portions of days, and that's the way they are treated in Excel as you deal with time math throughout different worksheets.

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