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# Excel/Calculating zulu time

Question
I have a spreadsheet that I'm trying to calculate time. So in E2 I have start time and F2 I have ending time. I don't want to have to add the colons each time. so how do I get G2 to give me house worked and what format and formula should I use. what I am currently using works for most but if I have 0600-1845 i Get 1275 or 0545-1830 = 1285 & it should be 1145. I will also need to sum the time

Martin,

E2:  0545
F2:  1830
=SUBSTITUTE(TEXT((LEFT(F2,LEN(F2)-2)&":"&RIGHT(F2,2))-(LEFT(E2,LEN(E2)-2)&":"&RIGHT(E2,2)),"hh:mm"),":","")

gave me 1245 which appears correct.  That is the string 1245.  If you want to make it a number as a result you would do

=SUBSTITUTE(TEXT((LEFT(F2,LEN(F2)-2)&":"&RIGHT(F2,2))-(LEFT(E2,LEN(E2)-2)&":"&RIGHT(E2,2)),"hh:mm"),":","")*1

Basically, I am putting in the colon in each, then doing a subtraction of time values so it does Time Math, then I am converting it back to your format.

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Regards,
Tom Ogilvy
This topic answers questions related to Microsoft Excel spreadsheet (or workbook) stand-alone or Mircrosoft Office Excel including Excel 2003, Excel 2007, Office 2000, and Office XP. You can get Excel help on Excel formulas(or functions), Excell macros, charting in Excel, advanced features, and the general use of Excel. This does not provide a general Excel tutorial nor the basics of using a spreadsheet. It provides specific answers to using Microsoft Excel only. If you do not see your Excel question answered in this area then please ask an Excel question here

#### Tom Ogilvy

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Selected as an Excel MVP by Microsoft since 1999. Answering Excel questions in Allexperts since its inception in 2001. Able to answer questions on almost all aspects of Excel's internal capabilities. If seeking a VBA solution, please specify that in your question itself so I give you the answer you want. [Excel has weak protection - if you are distributing an application, I don't answer questions on how to protect your project from your users.]

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Master of Science (MS) degree Operations Research (ORSA)

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Microsoft MVP in Excel.