// 00:00 - 04:00
const A = {
start: new Date(2021, 6, 21, 24, 0),
end: new Date(2021, 6, 22, 4, 0)
}
// 22:00 - 01:00
const B = {
start: new Date(2021, 6, 21, 22, 0),
end: new Date(2021, 6, 22, 1, 0)
}
console.log('A', {
start: new Date(2021, 6, 21, 0, 0).toLocaleTimeString('sr-SR'),
end: new Date(2021, 6, 22, 4, 0).toLocaleTimeString('sr-SR')
})
console.log('B', {
start: new Date(2021, 6, 21, 22, 0).toLocaleTimeString('sr-SR'),
end: new Date(2021, 6, 22, 1, 0).toLocaleTimeString('sr-SR')
})
const { differenceInHours, isBefore, isAfter } = require('date-fns')
const resultRange = {
start: isAfter(A.start, B.start) ? A.start : B.start,
end: isBefore(A.end, B.end) ? A.end : B.end
}
console.log(
differenceInHours(resultRange.end, resultRange.start)
)
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