My system crashed and I need to know the time of the crash before rebooting. I can easily determine it by adding the (last) timestamp in the crash dump to the boot time, but I forgot the boot time (I don't remember the exact second). To make things worse, I didn't post a Facebook message that I booted up. So rebooting is my only first step.
Next time this happens, I prefer the system to use the absolute time in the crash dump.