The jstat utility from the jigsaw release does not display timestamp when run with -t option.
The jstat from JDK 9 and 8 does display timestamp in this case.

To reproduce:
1) compile and run the attached program (it just produces a deadlock so it runs forever) .
2) In another terminal issue ps -ef | grep Deadlock to find the pid of the running program
3) jstat -compiler -t <pid>

The output is as follows. There is no Timestamp column:

Compiled Failed Invalid Time FailedType FailedMethod
     368 0 0 0.32 0

4) Do the same with jstat from JDK 9. The output is as follows:

Timestamp Compiled Failed Invalid Time FailedType FailedMethod
          963.9 368 0 0 0.32 0