leave-calendar-range.js
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/**
* 请假按自然日：1 天 = 24 小时；含 0.5 天时用「上午 / 下午」落在当天或最后一天的半日边界。
* @param {string} startDateStr YYYY-MM-DD
* @param {number} days 正数，且为 0.5 的倍数
* @param {'am'|'pm'} dayHalfPeriod 半天取上午或下午（仅在天数含 0.5 时参与计算）
* @returns {{ leaveStartTime: string, leaveEndTime: string, leaveHour: string }}
*/
export function computeLeaveRangeNaturalDay(startDateStr, days, dayHalfPeriod) {
const d = Number(days)
if (!startDateStr || !d || d <= 0) {
return { leaveStartTime: '', leaveEndTime: '', leaveHour: '' }
}
if (d * 2 !== Math.round(d * 2)) {
return { leaveStartTime: '', leaveEndTime: '', leaveHour: '' }
}
const period = dayHalfPeriod === 'pm' ? 'pm' : 'am'
const halves = Math.round(d * 2)
const fullDayCount = Math.floor(halves / 2)
const hasHalf = halves % 2 === 1
const base = new Date(String(startDateStr).replace(/-/g, '/') + ' 00:00:00')
if (Number.isNaN(base.getTime())) {
return { leaveStartTime: '', leaveEndTime: '', leaveHour: '' }
}
function formatDate(date) {
const y = date.getFullYear()
const m = `${date.getMonth() + 1}`.padStart(2, '0')
const day = `${date.getDate()}`.padStart(2, '0')
return `${y}-${m}-${day}`
}
function pad2(n) {
return String(n).padStart(2, '0')
}
function addDays(date, n) {
const x = new Date(date.getTime())
x.setDate(x.getDate() + n)
return x
}
let start
let end
if (fullDayCount === 0 && hasHalf) {
if (period === 'pm') {
start = new Date(base)
start.setHours(12, 0, 0, 0)
end = new Date(base)
end.setHours(23, 59, 59, 0)
} else {
start = new Date(base)
start.setHours(0, 0, 0, 0)
end = new Date(base)
end.setHours(11, 59, 59, 0)
}
} else if (fullDayCount > 0 && hasHalf) {
start = new Date(base)
start.setHours(0, 0, 0, 0)
end = addDays(base, fullDayCount)
if (period === 'am') {
end.setHours(11, 59, 59, 0)
} else {
end.setHours(23, 59, 59, 0)
}
} else {
start = new Date(base)
start.setHours(0, 0, 0, 0)
if (fullDayCount <= 0) {
return { leaveStartTime: '', leaveEndTime: '', leaveHour: '' }
}
end = addDays(base, fullDayCount - 1)
end.setHours(23, 59, 59, 0)
}
const leaveStartTime = `${formatDate(start)} ${pad2(start.getHours())}:${pad2(start.getMinutes())}:${pad2(start.getSeconds())}`
const leaveEndTime = `${formatDate(end)} ${pad2(end.getHours())}:${pad2(end.getMinutes())}:${pad2(end.getSeconds())}`
const h = d * 24
const leaveHour = Number.isInteger(h) ? String(h) : h.toFixed(1)
return { leaveStartTime, leaveEndTime, leaveHour }
}