internal/jobs: fix formatting string for time

Change-Id: I84d8a7310a559bf2382e08ae550dbf6ec648f6b7
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/505335
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Maceo Thompson <maceothompson@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/internal/jobs/job.go b/internal/jobs/job.go
index 40cac63..f03600e 100644
--- a/internal/jobs/job.go
+++ b/internal/jobs/job.go
@@ -33,7 +33,7 @@
 	}
 }
 
-const startTimeFormat = "060102-030405" // YYMMDD-HHMMSS, UTC
+const startTimeFormat = "060102-150405" // YYMMDD-HHMMSS, UTC
 
 // ID returns a unique identifier for a job which can serve as a database key.
 func (j *Job) ID() string {