Time zone conversions
"Time is constant, we come and go", but the beauty of earth is so, that time varies with space.
I made a simple BASH script to convert between different time zones, as i badly needed one such app, that would give me time in my terminal.
The script majors play with the GNU date utility. date - print or set the system date and time and -d or --date option take a date string to display the current date based on the string.
The script:
#!/usr/bin/bash # Author : hemanth [email protected] # License : GNU GPLv3 # Site : www.h3manth.com # This script converts given / local time to other time zones # To echo useage function useage() { echo "USEAGE : $0 [OPTION] <-z GMT,UTC,EDT,CST,MST,PST,IST> HH:MM" } function __print__() { date -d "$1" &> /dev/null if [[ $? == 0 ]];then echo "Given time ${1:-00:00} in various time zones:" echo "IST => $(date -d "$1 IST")" echo "UTC => $(date -d "$1 UTC")" echo "EST => $(date -d "$1 EST")" echo "EDT => $(date -d "$1 EDT")" echo "PST => $(date -d "$1 PST")" echo "CST => $(date -d "$1 CST")" echo "MST => $(date -d "$1 MST")" else echo invalid date $1 fi } while [[ $1 == -* ]]; do case "$1" in -h|--help|-\?) useage; exit 0;; -z)[[ $# > 2 ]]&& shift && date -d "$*" &>/dev/null; [[ $? == 0 ]] && date -d "$*" || useage ;shift; exit 0 ;; --) shift; break;; -*) echo "invalid option: $1" 1>&2; useage; exit 1;; esac done if [[ $1 != -* ]]; then __print__ $1 fi
Different scenarios :
$ bash tz.bash Given time 00:00 in various time zones: IST => Mon Sep 27 00:00:00 IST 2010 UTC => Mon Sep 27 05:30:00 IST 2010 EST => Mon Sep 27 10:30:00 IST 2010 EDT => Mon Sep 27 09:30:00 IST 2010 PST => Mon Sep 27 13:30:00 IST 2010 CST => Mon Sep 27 11:30:00 IST 2010 MST => Mon Sep 27 12:30:00 IST 2010 $ bash tz.bash -z 10:00 UTC Mon Sep 27 15:30:00 IST 2010 $ bash tz.bash -z 10:00 EST Mon Sep 27 20:30:00 IST 2010 $ bash tz.bash -z 10:00 CST Mon Sep 27 21:30:00 IST 2010 $ bash tz.bash -h USEAGE : tz.bash [OPTION] <-z GMT,UTC,EDT,CST,MST,PST,IST> HH:MM
Now trying to make similar code with other different programming languages, to compare and contrast, do share your code in your favorite language
Get the source code from HERE
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