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    The date times are text strings not real date/time. You will need to convert that to a proper date time: =--SUBSTITUTE(SUBSTITUTE(D2,"T"," "),"+",".") should do it. Put that in a blank column and copy/drag it down. Then copy and paste the values over the strings. Commented May 22, 2019 at 19:04
  • Thank you for looking into this, with the above I was able to convert say 2013-12-31T08:30:01+0000 to 41639.35418. Now when I pivot the data, put timestamp in rows and select group on right clicking one of the cells I get the error cannot goup the selection. Any idea how I can create bukets of 15 min intervals ? Commented May 22, 2019 at 19:21
  • I think I have a solution that uses Pivot Tables (by adding multiple working columns and some math); however, do you require it being in a Pivot Table? Can't you just sort the data by time and write a formula (which I can help with as well) in a new column that create a unique output that identifies which 15-minute group the data belongs to?
    – Brian
    Commented May 22, 2019 at 21:22
  • Hi Brian, no pivot is not necessary anything would do. I'm basically required to group the above createdtime column so that I can create 96 buckets of 15 minutes each (i.e 24 hours) for all the days of the year and then create a chart that shows in which bucket I received the most likes Commented May 22, 2019 at 21:27
  • the .35418 part is the fractional part of the day (e.g., .5 would be 12 noon). From there you can convert that to the 15 minute bucket that time belongs to. Then use a bar chart. Let me know if you need more hints on the conversion.
    – gns100
    Commented May 22, 2019 at 23:22