In Source file, there has the Unix timestamp which I would like to convert to be datetime format. Even I did as suggested in below link: http://www.visokio.com/dates-and-times
It could show datetime but still not valid: Ex: Unix Timestamp 1387265894 Follow the link the result will be: Jan 17, 1970 8:21:05 AM Actual value should be : Tue, 17 Dec 2013 07:38:14 GMT
Moreover, when followed the method as suggested in the link, in 'Field Organizer' the data type still be integer. So we could not use this value to do the calculate in any datetime functions.
Mon - Can we see an example file with the data imported as integer? Are you using first a Validate Fields block to import the field as integer, then a separate Field Organiser block to convert the imported integer value to Date/Time using the UNIX/POSIX conversion option?
I'd guess that you need to multiply the large integer number by 1000 beforehand. Unix timestamps are often in seconds, but in Omniscope the base unit for dates is milliseconds.