Commenting out time display I don't understand

collects/tests/racket/benchmarks/common/README.txt

@@ -22,9 +22,7 @@ run (as reported by --show). Similarly, if the first named
 implementation/benchmak starts with "no-", the default set is used
 minus the "no-"-specified implementation/benchmark.
 
-The output is a comment line
-  ; <date and time>
-and then a series of lines of the form
+The output is a series of lines of the form
   [<impl> <benchmark> (<cpu-msec> <real-msec> <gc-msec>) <compile-msec>]
 where #f means that the information is unavailable, or that the
 benchmark wasn't run due to an implementation limitation. The

collects/tests/racket/benchmarks/common/auto.rkt

@@ -574,7 +574,7 @@ exec racket -qu "$0" ${1+"$@"}
 
   ;; Run benchmarks -------------------------------
 
-  (rprintf "; ~a\n" (date->string (seconds->date (current-seconds)) #t))
+  #;(rprintf "; ~a\n" (date->string (seconds->date (current-seconds)) #t))
 
   (parameterize ([current-directory bm-directory])
     (for-each (lambda (impl)