bash-scripts/timezone-converter.bash at main · EysseW/bash-scripts · GitHub

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function convert() {
	case $1 in
		SST)
			HOURS=-11
			MINUTES=0
			;;
		HST)
			HOURS=-10
			MINUTES=0
			;;
		AKST)
			HOURS=-9
			MINUTES=0
			;;
		PST)
			HOURS=-8
			MINUTES=0
			;;
		MST)
			HOURS=-7
			MINUTES=0
			;;
		CST)
			HOURS=-6
			MINUTES=0
			;;
		EST)
			HOURS=-5
			MINUTES=0
			;;
		AST)
			HOURS=-4
			MINUTES=0
			;;
		NST)
			HOURS=-3
			MINUTES=-30
			;;
		GMT | UTC | WET)
			HOURS=0
			MINUTES=0
			;;
		WAT | CET)
			HOURS=1
			MINUTES=0
			;;
		CAT | SAST | EET | IST | CEST)
			HOURS=2
			MINUTES=0
			;;
		EAT | MSK)
			HOURS=3
			MINUTES=0
			;;
		PKT)
			HOURS=5
			MINUTES=0
			;;
		WIB)
			HOURS=7
			MINUTES=0
			;;
		HKT | WITA | AWST)
			HOURS=8
			MINUTES=0
			;;
		JST | KST)
			HOURS=9
			MINUTES=0
			;;
		ACST)
			HOURS=9
			MINUTES=30
			;;
		AEST)
			HOURS=10
			MINUTES=0
			;;
		NZST)
			HOURS=12
			MINUTES=0
			;;
	esac
	if [[ $2 = "HOUR" ]]; then
		echo $HOURS;
	elif [[ $2 == "MINUTE" ]]; then
		echo $MINUTES;
	fi
}

MY_TIMEZONE="CEST"
TO_CONVERT=$(zenity --entry --text="Format: <HH:MM>@<timezone>")
HOURS=$(echo $TO_CONVERT | awk -F'[:@]' '{print $1}')
MINUTES=$(echo $TO_CONVERT | awk -F'[:@]' '{print $2}')
TIMEZONE=$(echo $TO_CONVERT | awk -F'[:@]' '{print $3}')

MY_OFFSET_HOURS=$(convert $MY_TIMEZONE "HOUR")
MY_OFFSET_MINUTES=$(convert $MY_TIMEZONE "MINUTE")

OFFSET_HOURS=$(convert $TIMEZONE "HOUR")
OFFSET_MINUTES=$(convert $TIMEZONE "MINUTE")

NEW_HOURS=$(($HOURS + $MY_OFFSET_HOURS - $OFFSET_HOURS))
NEW_MINUTES=$(($MINUTES + $MY_OFFSET_MINUTES - $OFFSET_MINUTES))

if (( NEW_HOURS > 24 )); then
	NEW_HOURS=$(($NEW_HOURS-24))
fi

if (( ${#NEW_MINUTES} == 1 )); then
	NEW_MINUTES="$NEW_MINUTES"0
fi

echo "$NEW_HOURS:$NEW_MINUTES"
notify-send "$HOURS:$MINUTES in $TIMEZONE is" "$NEW_HOURS:$NEW_MINUTES in $MY_TIMEZONE"