This is a common issue, but the unique aspect of this situation is as follows:
I am attempting to calculate the hours between 12:00 (timeA) and 20:00 (timeB). A basic
dayjs(timeA).diff(timeB, 'hours')8 hours.
The challenge arises when calculating the hours between 20:00 and 02:00 midnight, which results in 18 hours instead of the desired 6 hours.
Is there a method using dayJs to achieve the correct calculation in this scenario?
When utilizing dayjs, it automatically converts the time you provide to it into the time of day. In the code snippet below, I have compared two times and adjusted one of them to ensure the time difference is calculated correctly. This method works effectively only if the times you input have a specific order, with one coming before the other.
function calculateTimeDifference(timeA, timeB) {
const ta = dayjs(timeA, 'HH:mm');
let tb = dayjs(timeB, 'HH:mm');
if (ta.isAfter(tb)) tb = tb.add(1, 'd');
const difference = dayjs(tb).diff(ta, 'hours');
console.log(`The time difference between ${ta.format('YYYY-MM-DD HH:mm')} and ${tb.format('YYYY-MM-DD HH:mm')} is ${difference} hours`);
}
calculateTimeDifference('12:00', '20:00');
calculateTimeDifference('20:00', '02:00');<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.8/plugin/customParseFormat.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dayjs@1/dayjs.min.js"></script>
<script>
dayjs.extend(window.dayjs_plugin_customParseFormat)
</script>After typing out my thoughts, it hit me that the solution was simply 24 - 18. Utilizing the rubber duck method, I suppose. Nevertheless, I decided to share it here in case someone else had trouble figuring it out.
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