Hello - I'm trying to declare my data as time series for 30 study participants with data recordings every 15 seconds to 2 minutes but continually get the error 451 code. .Thank you in advance for your advice on this.

Code:
* Example generated by -dataex-. For more info, type help dataex
clear
input float IDnum double(Session dateT dateT2) float(doy hr min)
1 3      1898207739000      1898207739000 55 23 55
1 3 1898207708999.9998 1898207708999.9998 55 23 55
1 3 1898207799999.9998 1898207799999.9998 55 23 56
1 3 1898207770000.0002 1898207770000.0002 55 23 56
1 3 1898207829999.9998 1898207829999.9998 55 23 57
1 3 1898207861000.0002 1898207861000.0002 55 23 57
1 3      1898208288000      1898208288000 56  0  4
1 3 1898208256999.9998 1898208256999.9998 56  0  4
1 3 1898208622999.9998 1898208622999.9998 56  0 10
end
format %tc dateT
format %tC dateT2
The error code r(451) appears after entering the first 3 tsset commands and this error warning appeared as well after the third tsset command "warning: Variable dateT2 had been formatted %tC (a period), and you asked for a clocktime period. Are you sure that is what you want? Format has been changed. dateT2 is now formatted %tc:
following code
i
Code:
tsset ID_Sess dateT, clocktime delta(1 seconds)
Code:
tsset ID_Sess dateT2, clocktime
Code:
format %tC dateT2

tsset ID_Sess dateT2, clocktime