Wrap up time format in report

Dear all,
The wrap-up time column in the "Export Call Report" is showing in date and time format of excel, whereas it should show the values in numbers (seconds).
Please assist me ASAP in getting this fixed.
wrapup_time
02-07-18 23:16
30-06-18 17:04
03-07-18 0:52
03-07-18 1:31
03-07-18 3:47
03-07-18 6:05
03-07-18 8:47
03-07-18 9:40
03-07-18 9:41
03-07-18 10:08
03-07-18 10:13
03-07-18 10:17
The wrap-up time column in the "Export Call Report" is showing in date and time format of excel, whereas it should show the values in numbers (seconds).
Please assist me ASAP in getting this fixed.
wrapup_time
02-07-18 23:16
30-06-18 17:04
03-07-18 0:52
03-07-18 1:31
03-07-18 3:47
03-07-18 6:05
03-07-18 8:47
03-07-18 9:40
03-07-18 9:41
03-07-18 10:08
03-07-18 10:13
03-07-18 10:17