turn on timestamps in kernel log messages?

Hello,

In periodic daily emails it's recorded if there's anything
in kernel log messages during the last 24 hrs. The problem
is that the lines pertaining to these messages aren't timestamped
so the information is of less use in tracking down a problem
than it could be. Example:

+pid 96879 (conftest), jid 8779, uid 0: exited on signal 11 (core dumped) 
+tap2: link state changed to DOWN 
+swap_pager: out of swap space
+swp_pager_getswapspace(7): failed

In the same email, login failures are timestamped.

Is there a way to have kernel log messages timestamped so they appear as
such in periodic daily emails?

TIA
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