wdate: worldwide timezone date

wdate.sh

#!/bin/bash

# date --date='TZ="UTC+4" 2016-08-22 10:37:44' "+%Y-%m-%d %H:%M:%S"

# Show date and time in other time zones

search=$1

format='%a %F %T %z'
zoneinfo=/usr/share/zoneinfo

if command -v timedatectl >/dev/null; then
    tzlist=$(timedatectl list-timezones)
else
    # tzlist=$(find -L $zoneinfo -type f -printf "%P\n")
    tzlist=$(find -L $zoneinfo -type f|rev|cut -d '/' -f 1,2|rev)
fi

grep -i "$search" <<< "$tzlist" \
| while read z
  do
      d=$(TZ="$z" gdate +"$format")
      printf "%-32s %s\n" "$z" "$d"
  done