simple timediff in bash where a date was generated with date - useful for quick debugging

timdiff.sh

#!/usr/bin/env bash

datediff() {
  d1=$(date -d "$1" +%s)
  d2=$(date -d "$2" +%s)
  s_t=d1-d2
  hours=$((s_t / 3660))
  s_t=$((s_t % 3600))
  minutes=$((s_t / 60))
  seconds=$((s_t % 60))
  printf '%02d:%02d:%02d' $hours $minutes $seconds
}