dmesg -T

#!/bin/sh
# Translate dmesg timestamps to human readable format

# uptime in seconds
uptime=$(cut -d " " -f 1 /proc/uptime)

# remove fraction
uptime=$(echo $uptime | cut -d "." -f1)

# run only if timestamps are enabled
if [ "Y" = "$(cat /sys/module/printk/parameters/time)" ]; then
  dmesg | sed "s/[^\[]*\[/\[/" | sed "s/^\[[ ]*\?\([0-9.]*\)\] \(.*\)/\\1 \\2/" | while read timestamp message; do
    timestamp=$(echo $timestamp | cut -d "." -f1)
    ts1=$(( $(busybox date +%s) - $uptime + $timestamp ))
    ts2=$(busybox date -d "@${ts1}")
    printf "[%s] %s\n" "$ts2" "$message"
  done
else
  echo "Timestamps are disabled (/sys/module/printk/parameters/time)"
fi