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niun/time-from-internet.sh

Created July 15, 2016 17:19
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show time from Internetz in shell, iso-8601
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time-from-internet.sh
curl -G -s --data-urlencode "format=%FT%T%:z" http://www.timeapi.org/cet/now # www.timeapi.org cet is CET/CEST. Don't use cest
date --iso-8601='seconds' -d "$(curl -s http://www.timeapi.org/utc/now)" # www.timeapi.org use local timezone settings
date -d "$(curl -s http://www.timeapi.org/utc/now)" +"%FT%T (UTC%:z = %Z)" # not quite ISO with timezone illustration
date -d "$(curl -s http://www.timeapi.org/utc/now)" +"%A %d.%m.%Y, %T (UTC%:z = %Z)" # non-ISO, easy readable by a german with day of week
date --iso-8601='seconds' -d "$(curl -s --head http://google.com | grep ^Date: | sed 's/Date: //g')" # google.com
date --iso-8601='seconds' -d "$(cat </dev/tcp/time.nist.gov/13 | cut -d' ' -f2,3) UTC" # NIST
date --iso-8601='seconds' -d "$(cat </dev/tcp/de.pool.ntp.org/13)" # ntp pool project
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