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    • Bureaucratic Affairs Building HHW System Logic Exercise
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    • Chilled Water Plant System Diagram Exercise
    • The HIjend Hotel >
      • Chilled Water Plant Scoping Exercise
      • Ballroom AHU Scoping Exercise
      • Cooling Tower Scoping Exercise
  • Tools
    • Altitude Correction Factor
    • Economizer Evaluation Checklist
    • Eikon for Educators and WindLGC
    • Effective Duct Length Tool
    • Excel Third Axis Tool
    • Excel Time Value Conversion
    • Insulation Savings Tools
    • Logic Diagram Tool
    • Mixed Air Calculations
    • Monitoring Plan Spreadsheet
    • Pipe Friction Chart
    • Plot Digitizer >
      • Plot Digitizer Pump Curve Example
    • Square Law Spreadsheet
    • System Diagram Symbols
    • Thermodynamic Diagrams Spreadsheet
    • Universal Translator Data Analysis Tool
    • y = (m * x) + b Spreadsheet
  • Useful Formulas
    • Affinity Laws
    • Circular Equivalent Duct
    • Effective Duct Length
    • FT Guide Appendix C
    • HVAC Equations and Concepts
    • Hydraulic Diameter
    • Pump Power and Energy
    • "Square Law"
  • What's That Thing?
    • Cooling Towers
    • Pumps
    • Valves
  • Resources
    • Bill Coad's Writings
    • Data Logging Resources
    • EBCx Skills Guidebook
    • Energy Design Resources
    • Fisher Controls Valve Cavitation Bulletin
    • Functional Testing Guide
    • Honeywell Gray Manual
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    • PID Resources
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    • Vintage Carrier Design Manual
    • VRF Systems
    • Williams' Wisdom
  • Videos
    • Bureaucratic Affairs HHW Logic Answers
    • Cooling Tower Flow Variation
    • Economizer Stratification
    • Functional Testing
    • Induction Principles
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    • Ripple Effects
    • Testing a Pump
    • The Garden of Low Entropy
    • Variable Flow Systems
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      • ASHRAE
      • ASHRAE - Engineers Notebook
      • BCxA and NCBC
      • BEST Institute
      • Case Studies
      • ERDC 2020 RCx Academy
      • ELPNW
      • ICEBO
      • Marriott AEP
      • Magazine Articles
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        • PEC Class Materials Archive
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Excel Time Value Conversion Spreadsheet

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As many of us know, Excel represents dates as a serial number so that it can do math with them.  For instance, if you looked at the value in a cell that had "1/31/22 2"29 PM" in it, you would actually see 44592.603472.  It is the formatting of the cell that causes it to display as a number.   

Personally, I did not always know this and for a while, when I first started using Excel, was baffled by how to format a time series axis for a specific date range and for specific major and minor divisions.  As a result, I built a little spreadsheet that I uses as a "cheat sheet" when I am setting up time series graphs.

At some point, Excel took a bit of the mystery out of things because if you are formatting a time series axis and simply type the date and time you want for the "minimum" and "maximum" value fields (the fields with the red arrows pointing to them in the image below), then Excel fills in the appropriate value.
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But I have yet to figure out how to do a similar thing for the "units" fields (the field with the blue arrows pointing to them in the image above), so I still rely on my little cheat sheet for that sort of thing, especially when I need a unit that is not common increment of 1 (like 0.00069444 for 1 minute which eludes my aging memory vs. .125 for 3 hours, which I can remember or derive pretty easily). 

So, I figured others might find it useful as well and offer it here, for what it is worth.   You may also find the blog post that I did on the topic to be helpful if this is all new to you.
time_value_conversions_vweb.xlsx
File Size: 26 kb
File Type: xlsx
Download File

On a related note, I discovered that it is possible to use a User Defined Function (UDF) to allow Excel to adjust the minimum and maximum axis values by referring to cells in a spreadsheet where you enter the values you want, which makes it possible to quickly and somewhat dynamically change the range of a chart with out having to go through the axis format dialog.  I provide the details in a blog post titled Using a Formula to Adjust an Axis in Excel, Plus a Simultaneous Heating and Cooling Case Study.   The spreadsheet I use to illustrate this is provided below in case you want to download it for reference.
set_chart_axis_support_vweb.xlsx
File Size: 12086 kb
File Type: xlsx
Download File

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