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July 16, 2012 1 Comment

How to Create a Series of 30 Minute Time Intervals in Excel

How Excel Stores TimeOne of my readers tracks data points at 30 minute (half-hour) periods throughout the day. He asked me for some help in streamlining this process.

AutoFill the Step-value for a Series

You can use AutoFill in Excel to create this series. Here are the steps to take:

  1. In two adjacent cells, enter the beginning time value and the time that is 30 minutes later than the beginning time value.
  2. Select BOTH cells and AutoFill the cells in the range that you want to “populate.”

Calculate Decimal Number that Represents 30 Minutes

You can calculate the numeric value for a half-hour (30 minute) period:

  1. Use a Formula to subtract the Start Time from the End Time.
  2. Format the result as a Number with 6 Decimal Places.

In this case, the result is: 0.020833 which you can use as a Constant Value in a Formula.

Keyboard Shortcut to Enter the Current Time

Ctrl + Shift + : (Colon) will “time stamp” a cell.

How Excel Stores Time

While you can Format Time in a variety of ways, Excel must be able to recognize and store Time entries as Numeric entries! This means that correctly entered times align to the right-side of the cell. Time values are stored as a “decimal part of one” day. For example, 12:00 PM (Noon) is stored as 0.50 – 50% of the day has elapsed

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Watch Tutorial in High Definition

Click on this link to watch this Excel Tutorial in High Definition on my YouTube Channel – DannyRocksExcels

How to Create a Series of 30 Minute Intervals in Excel [ 6:22 ] Play Now | Play in Popup | Download (2689)
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July 8, 2011 1 Comment

Use Excel’s AutoFill Tools and Formulas to Increment Time Intervals

In my experience, many Excel users get “frustrated” when trying to enter and calculate Time Intervals. For example, setting up a schedule for meetings that begin and end in 45 minute intervals. After you watch this video tutorial, you will learn how easy it is to set up this type of schedule!

The Problem with Time in Excel

When it comes to entering Time Values, Excel will only accept a short list of Time Formats. For example, 6:00 AM is a valid Time Entry in Excel. However, Excel will treat 6:00 A.M. as a “text entry!” 6:00 AM is stored as the decimal value 0.25 in Excel. Decimals are numbers that Excel can calculate and increment. In this video, I demonstrate a shortcut that ensures that you always enter a Time Value as a Number.

How to Increment in Two-Hour Intervals

As I demonstrate in this video, use this formula to increment a series of two-hour time intervals:

=starting_cell + 2*(1/24)

In this case the (1/24) portion of the formula indicates a “one-hour segment.” 1 hour out of a 24 hour day. The +2 part of the formula indicates that you want to increment by 2 – of what? The answer is +2*(1/24) – by 2 hours.

To indicate a 15 minute increment use this formula:

=starting_cell + 15 * (1/24/60) – That is, divide each one hour segment (1/24) by 60 minutes (1/24/60) and multiply this by the number of minutes that you wish for your schedule.

Watch Part 1 of this Series – Increment Dates in Excel

Follow this link to watch Part 1 of this two-part series – “Use Excel’s AutoFill Tolls and Excel Functions and Formulas to Increment Date Intervals.”

View this Tutorial in High Defintion on YouTube

Click on this link to watch the video lesson in High Definition on my YouTube Channel – DannyRocksExcels

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Use Excel's AutoFill Tolls and Formulas to Increment Time Intervals [ 9:02 ] Play Now | Play in Popup | Download (2003)
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September 30, 2008 Leave a Comment

How to Solve Four Frustrations When Calculating Time in Excel

Have you ever been frustrated when you:

  1. Entered a “Time Value” in a cell only to find that Excel did not recognize it as a “time value?”
  2. Wrote a formula to calculate the elapsed time between “start and finish” only to find that Excel returned a “date” (e.g. 1/15/2008) and not a number?
  3. Wrote a formula to calculate the hours worked for your “Graveyard Shift” (those whose work hours cross Midnight) only to get a cell full of ########?
  4. Used the AutoSum function to calculate the total hours worked in a week only have Excel return a “silly” total like 1.7915?

Well, join the club! Most of my clients have experienced these four frustrations when they try to calculate “time values” in Excel. In this short video lesson, I will demonstrate how to solve each of these four frustrations.

I’d like to receive your feedback on this video lesson. Have you ever encountered this frustation? Did my explanation help you? What additional topics would you like me to cover?

You can email me – danny@thecompanyrocks.com

Here are the steps to follow in this video lesson:

  • Excel stores Time values as decimal numbers. Midnight is 0.00; 6:00 AM is 0.25; Noon is 0.5
  • Be careful when you enter “time values” into a cell. 12:00PM is considered “text.” You need to include a SPACE before the PM e.g. 12:00 PM in order to tell Excel that this is a “time value.”
  • Use this Keyboard Shortcut Ctrl+Shift+~ (Tilde) to see how Excel stores a “time value” in a cell.
  • When calculating “elapsed time”, use a “Custom Format” for  the cell with the Formula E.g. [h]:mm
  • When you calculate “elapsed time” for cells that “cross midnight” you will get ###### as your result unless you use a formula like =MOD((End_Time-Start_Time), 1)
  • When you total “time values” that will exceed 24 hours (E.g. Hours worked in a week) format the cell containing the formula with a “Custom Format” e.g.[h]:mm

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