Days between dates: Difference between revisions
Add Factor
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daysbetween:between("2019-01-01", "2019-09-30").
272
</pre>
=={{header|Factor}}==
Factor supports the addition and subtraction of timestamps and durations with the <code>time+</code> and <code>time-</code> words.
<lang factor>USING: calendar calendar.parser formatting kernel math ;
: days-between ( ymd-str ymd-str -- n )
[ ymd>timestamp ] bi@ time- duration>days abs ;
"2019-01-01" "2019-09-30"
"2016-01-01" "2016-09-30" ! leap year
[
[ days-between ] 2keep
"There are %d days between %s and %s\n" printf
] 2bi@</lang>
{{out}}
<pre>
There are 272 days between 2019-01-01 and 2019-09-30
There are 273 days between 2015-12-31 and 2016-09-30
</pre>
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