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Finding missing dates.

Posted on 2016-09-27
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Last Modified: 2016-11-06
I have file with some data for 1 year. The time gap is 15 minutes as you can see in the file. However some of the data are missing and I would like to have an easy way to find it out. I would like to have the missing date,time in the respective row. Is it possible?
Can anybody please help me?
I have attached the file.

Thanks in advance.
upload.csv
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Question by:Prashansa Shrestha
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Assisted Solution

by:D Patel
D Patel earned 1000 total points
ID: 41817739
Hi Prashansa,

You can take reference from the sheet which I have prepared to incorporate logic in your sheet.

Instead of writing VBA it will be easier for you to find the missing dates using Array Formulas.

You can find the attached sheet.
Missing-Dates-example.xlsx
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Expert Comment

by:D Patel
ID: 41817763
You also refer the file attached herewith (which matches your requirement) : (Using VBA)
FindMissingDate-15minutesInterval.xls
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Accepted Solution

by:
Rob Henson earned 1000 total points
ID: 41817777
Open the file in Excel and the Date and time will potentially show in one column with the results for each slot then in columns B C & D.

In a separate sheet, recreate the Date and Time columns with all entries.

In cell A2 just type the date 01/01/2014, in A3 type =A2 and copy down as far as row 97. In A98 then put =A2+1 and copy down to row 35041  (24hrs x 4 time slots x 365 days = 35040 entries)

In Cell B2 type 00:00:00, B3 type =B2+TIME(0,15,0) and copy down as far as row 97. In B98 type =B2 and copy down again as far as 35041.

Obviously you could do the formula in A3 to B97 at the same time ad then do A98 and B98 and copy them both down.

In columns C D & E row 2 then put this formula:

Col C =IFERROR(VLOOKUP(TEXT($A2+$B2,"dd.mm.yyyy hh:mm"),upload!$A:$D,2,FALSE),"")
Col D =IFERROR(VLOOKUP(TEXT($A2+$B2,"dd.mm.yyyy hh:mm"),upload!$A:$D,3,FALSE),"")
Col E =IFERROR(VLOOKUP(TEXT($A2+$B2,"dd.mm.yyyy hh:mm"),upload!$A:$D,4,FALSE),"")

and copy down the full extent.

Now apply a filter to the data and select column C to show only blank. Those are your missing values.

If you remove the filter and copy, paste values; you will have a replicated version of the data with missing date/time entries inserted.

See attached.
missing-entries.xlsx
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Expert Comment

by:frankhelk
ID: 41875972
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Split:
-- Rob Henson (https:#a41817777)
-- D Patel (https:#a41817739)


If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

frankhelk
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