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Delete Date & Time Cells Based On Time


I have a large dataset where the first column is date and time i.e. "20/01/2005 03:41:06" and I want to delete certain rows based on the times. I have already tried playing about with macro's but failed fairly spectacularly so far. I have code from someone else to delete cells if the value equals a certain time but this doesn't work as the cell contains the date too.

I have already recorded one macro to reformat the data to as the software return 10 timestamped samples per hour and I want 8 i.e. every three hours so there is constant separation for statistical purposes. Both the macros are shown below so you can see what I have.

Ideally I would like to replace the line - If (r.Cells(n, 1) = TimeValue("22:41:06")) ............ - with one that reads - If (r.Cells(n, 1) CONTAINS TimeValue........ - but I don't know if that is possible? If not is there a way to separate the time from the date into 2 columns and then I can delete rows based on the time column using the code below? .......


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