Excel Number Format default to Time - excel

I have a bit of an annoying issues with an excel workbook around the default number format which I have been struggling to resolve.
In my spreadsheet the default number format looks to have been set to ‘Time’ (by default) so that even when I change the format and interest a new sheet the defaults is ‘Time’. This happen even after changing and restarting.
Is there a way to reset the Number formatting back for a workbook back to ‘General’?
ps I am using Excel 2013.
Thanks

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Updates Values on Excel and PPT

I wanted to create an excel file that calculates the days diference between a fixed date and today's date and display that value in a PPT.
1st Problem: If I change my date on the computer, the Today Cell does not change by itself; I tried to make a Vba code for Update but it didn't work
2nd Problem: the PPt value change automatically But If I put the PPt in Presentation Mode I lose the connection, and I have to update the connection again.
Note: If there is a way to do all the calculation in the PPt it will be Correct
Thank you

Excel 2013 default format is Date when adding a new sheet - how to change to General?

I have a complicated Excel workbook and for some reason, when I add a new sheet, the default format for the cells is Date and not General as is the case in my other Excel files. How do I fix it so if I add a new sheet, the default format is General? It's only this workbook. If I open a new excel file or even add sheets to other excel files, the default format is General.
This has been reported off and on for many years. For reasons unclear, the Normal cell style gets modified to date. So go to the Home Ribbon and, on the Styles tab, right-click on Normal and select Modify. Change it back to General

MS Excel 2013 linked data formula reverts to value #REF despite linked values not changing

I am currently working on an MS Excel 2013 spreadsheet (p:\master.xlsx) where some cells contain values that are directly linked from other MS Excel 2013 spreadsheets (p:\path1\feeder1.xlsx, p:\path1\feeder2.xlsx, etc).
What I am finding occasionally (not every time), is when I open up my p:\master.xlsx spreadsheet (and then "enable editing" and "enable content"), some of the values in this spreadsheet change from the correct linked value (a number) to value #REF.
When I look at the formula within these offending cells, I see it has also changed from say:
=MAX('P:\path1\[feeder1.xlsx]Sheet1'!$C:$C)
to
=MAX('P:\path1\[feeder1.xlsx]#REF'!$C:$C)
I can confirm the feeder.xlsx spreadsheet has not been moved or renamed and has not had it's values changed at all. The network drive the files sit on is also stable.
What is confusing me is that this appears to happen at random times (as opposed to every time). In addition, not all the cells revert to #REF - some of the values are still OK (and thus the formula is OK).
Due to not knowing if or when the formulas will change to their "#REF" status, I need to save the file every time I make a change (slightly frustrating).
I searched the forum and noticed another user had a similar issue on MS Excel 2010 but the answers provided did not appear to solve the user's issue. Anyone have any suggestions?
First make sure you're formula is not too long if your using 97-2003. if so save the file as .xlsx
if that don't work do the following
close all open workbooks.
open the workbook with the (now) broken links (#ref).
Click on the Data tab
Click on Edit Links.
Excel doesn't like links to closed workbooks

LastDate-time when cell has been modified

I have excel spreadsheet
I am looking to know date-time when my excel cells have been modified last time.
Can I do it in Excel or Access?
If yes, what function I can use?
Thanx!
in Excel, you can Track Changes
This opens up the workbook for sharing, and you can even tell Excel to track specific cells, and if you want your changes tracked or not.
This is an example of what you see when values are changed:
You can use this Track Changes feature to find out the last modifier date of a cell and find who the user was.
How to Track Changes in Excel 2007
http://www.online-tech-tips.com/ms-office-tips/track-changes-in-excel/

Live charts in Excel: for future dates, lines drop to zero

I run live market charts in Excel. A graph indicator runs from live data fed by the broker through the DDE facility in Microsoft Excel. It works fine and I am happy with it - except for one blemish I hope you can assist with.
The lines of the graph (it is a line chart type) are created in real time. The present time and the past time are great, very clean. Unfortunately in the period just ahead i.e. that hasn't arrived yet, the lines of the graph drop to zero and crawl along the x-axis into the future. This spoils the current reading of the graph.
Is there any way I can prevent this happening so that the lines (properly called curves) only exist in the past and current time period. The worksheet is set not to show zero values in formulae, but the charting facility does not appear to have this function.
If you put #N/A in the cell (using the =NA() function) the points are not drawn.
To hide the ugliness of your cells now having #N/A in them for future dates you can use a number format or conditional formatting to hide error values. You do this by adding a formula to your conditional formatting of
=ISNA(A1)
and setting the format to be a white font on a white background. Which makes the cells with #N/A in them appear blank. For versions of Excel prior to conditional formatting being available you can do the same thing with a number format but in reverse. i.e., set your font to white so all cells are invisible by default and set your number format to:
[black]0.0;[red]-0.0;[black]0.0;[black]
which should make anything that isn't an error appear with either a black or red font colour.
Regards
Dave
I once saved an Excel 97 Worksheet (with charts) in Excel 2003. After that, whenever I saved the file in '97, I got a prompt telling me that the spreadsheet was created in a newer version of Excel.
To eliminate the prompt I opened it in 2003 and saved it as an Excel 5.0/95 Workbook (*.xls). Then whenever I opened it in 97 the line charts dropped to zero at the end. They didn't do that before.
To correct the problem I right-clicked on the chart, selected Chart type, selected Custom Types, then "Colored Lines". Apparently when I saved it as Excel 5.0/95 that chart type was not supported, so the program defaulted to the type "Smooth Lines". After changing the chart type to "Colored Lines" it was only necessary to do some minor formatting.
This experience suggests a solution to the line dropping to zero problem regardless of what triggered it. Simply change the chart type. When I did that the dropped line disappeared and I didn't have to use the #N/A approach.

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