A quick patch for supervisor to add in timestamp for the standard output and standard error log file of the processes.

supervisor_timestamp.patch

diff --git a/supervisor/dispatchers.py b/supervisor/dispatchers.py
index 5a96199..dc8087a 100644
--- a/supervisor/dispatchers.py
+++ b/supervisor/dispatchers.py
@@ -134,7 +134,7 @@ class POutputDispatcher(PDispatcher):
 
         maxbytes = getattr(config, '%s_logfile_maxbytes' % channel)
         backups = getattr(config, '%s_logfile_backups' % channel)
-        fmt = '%(message)s'
+        fmt = '%(asctime)s: %(message)s'
         if logfile == 'syslog':
             warnings.warn("Specifying 'syslog' for filename is deprecated. "
                 "Use %s_syslog instead." % channel, DeprecationWarning)