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diff --git a/on-battery-time.sh b/on-battery-time.sh
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+++ b/on-battery-time.sh
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+#!/bin/sh
+# File: /usr/local/bin/on-battery-time.sh
+# Author: bgstack15
+# Startdate: 2019-06-09 22:35
+# Title: Report how long this system has been on battery or AC power
+# Package: on-battery-time
+# Purpose:
+# History:
+# Usage:
+# Reference:
+#    https://stackoverflow.com/questions/12199631/convert-seconds-to-hours-minutes-seconds/18683834#18683834
+# Improve:
+# Dependencies:
+#    bc
+#    date
+#    the udev rules from 99-on-battery-time.rules
+# Documentation:
+
+OBT_INFILE=/var/log/battery.log
+
+# FUNCTIONS
+convertsecs() {
+    _h=$( expr $1 / 3600 )
+    _m=$( expr $1  % 3600 / 60 )
+    _s=$( expr $1 % 60 )
+    printf "%02d:%02d:%02d\n" ${_h} ${_m} ${_s}
+}
+
+# learn most recent utility time
+last_utility_time="$( { tac "${OBT_INFILE}" | awk '/utility power/{print $2}' ; echo 0 ; } | head -n1 )"
+
+# learn most recent battery time
+last_battery_time="$( { tac "${OBT_INFILE}" | awk '/on battery/{print $2}' ; echo 0 ; } | head -n1 )"
+
+# learn current time
+OBT_current_time="$( date "+%s" )"
+
+if test ${last_utility_time} -ge ${last_battery_time} ;
+then
+   OBT_last="${last_utility_time}"
+   OBT_phrase="utility power"
+else
+   OBT_last="${last_battery_time}"
+   OBT_phrase="on battery"
+fi
+
+OBT_seconds="$( printf "%s-%s\n" "${OBT_current_time}" "${OBT_last}" | bc )"
+
+printf "%s seconds: %s\n" "${OBT_phrase}" "${OBT_seconds}"
+convertsecs "${OBT_seconds}"