/home/alex/dev/worldclock.sh (1)

#!/bin/bash -
# ------------------------------------------------------------------------------
# worldclock.sh
# =============
#
# Scope     Native
# Copyright (C) 2024 by RaySoft, Zurich, Switzerland
# License   GNU General Public License (GPL) 2.0
#           https://www.gnu.org/licenses/gpl2.txt
#
# ------------------------------------------------------------------------------

set -o 'noglob' -o 'nounset' -o 'pipefail' # -o 'xtrace' -o 'errexit'

# ------------------------------------------------------------------------------

CITIES=('Australia/Sydney' 'Europe/Zurich' 'Europe/London' 'America/New_York')

# ------------------------------------------------------------------------------

DATE=('/usr/local/bin/gdate')
PRINTF=('/usr/local/bin/gprintf')

# ------------------------------------------------------------------------------

for city in "${CITIES[@]}"; do
  city_name="${city##*/}"; city_name="${city_name//_/ }"

  "${PRINTF[@]}" '%-9s ' "${city_name}"

  TZ="${city}" "${DATE[@]}" '+%H:%M  %:z'
done

# ------------------------------------------------------------------------------

exit 0

Usage

~/dev/worldclock.sh

Output:

Sydney    06:00  +11:00
Zurich    20:00  +01:00
London    19:00  +00:00
New York  14:00  -05:00