Bash: number of seconds till midnight of current day

Question

How do I find the number of seconds till midnight of current day?

@Benoit : I considered that, but decided against because I thought that this would be scripting, not programming.
Warning: you are trying to do interval arithmetic with absolute times of day. Think carefully about what happens around DST transitions.
@Phil : Yup, a solution which takes DST (and other corner cases) would be ideal

bmk · Answer 1 · 2011-03-16 13:24:44Z

up vote 3 down vote accepted

What about:

echo $(($(date -d "$(date +00:00-24:00)" +%s)-$(date +%s)))

answered Mar 16 '11 at 13:24

bmk
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Dennis Williamson · Answer 2 · 2011-03-16 13:24:41Z

up vote 3 down vote

If you have a version of date that supports it:

echo $(($(date -d 23:59:59 +%s) - $(date +%s) + 1))

or

echo $(($(date -d 'tomorrow 00:00:00' +%s) - $(date +%s)))

answered Mar 16 '11 at 13:24

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2 Answers