Show all Sundays between now and the end of a given year

sundays.sh

#!/bin/zsh -f
## Note: requires `gdate` --> brew install coreutils

	# What year do you want to stop at?
	# i.e. "2015" = print all Sundays from now until the end of 2015
STOP='2015'

	# We need to figure out when the next Sunday is…
	# Step 1) This is today (will be number 0-7)
TODAY=`gdate '+%u'`

	# Step 2) This is how many days it is until the next Sunday
COUNT=`expr 7 - $TODAY`

	# This is the year we are starting with
YEAR=`gdate --date "+${COUNT} day" '+%Y'`

	# While the 'year' is less than or equal to the STOP year
while [ "$YEAR" -le "${STOP}" ]
do
	# calculate and print the date
	# Note that you can control the format of the date here too
	gdate --date "+${COUNT} day" '+%B %d, %Y'

	# increment the counter
	COUNT=`expr ${COUNT} + 7`

	# check the resulting year
	YEAR=`gdate --date "+${COUNT} day" '+%Y'`

done

exit 0
# EOF