I try to loop through two given date time. I have to make some calculation on each day of the range. I made a JsBin to setup the problem.
const timeRange1 = ['2019-10-22 14:00:00', '2019-10-22 19:00:00']; const timeRange2 = ['2019-10-22 13:30:00', '2019-10-24 10:00:00']; const timeRange3 = ['2019-10-22 06:00:00', '2019-10-23 23:00:00']; const timeRange4 = ['2019-10-21 23:00:00', '2019-10-22 01:00:00']; function loop(range) { const rangeStart = moment(range[0]) const rangeEnd = moment(range[1]) let i = 0 for (let m = rangeStart; m.diff(rangeEnd, 'days') <= 0; m.add(1, 'days')) { i++ } return i } // Here you can see the expected values and the wrong results. console.log(loop(timeRange1)); // 1 - 2 console.log(loop(timeRange2)); // 3 - 3 console.log(loop(timeRange3)); // 2 - 3 console.log(loop(timeRange4)); // 2 - 2
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
This seems to come from the times. When the time part of the range end is higher than the one from the range start, adding a day does not make the diff lower than 0.
If you truncate them from your moment values, the results are what you expect (use .startOf('day')
)
function loop(range) {
const rangeStart = moment(range[0]).startOf('day')
const rangeEnd = moment(range[1]).startOf('day')
let i = 0
for (let m = rangeStart; m.diff(rangeEnd, 'days') <= 0; m.add(1, 'days')) {
i++
}
return i
}
The problem is that diff truncates to an integer, so the loop doesn't stop until the difference is at least 1 day. Consider the first example:
1st iteration:
2nd iteration:
3rd iteration
The comparison needs to either:
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