這段代碼經過測試可以運行，可以精確到分鐘。
/**
* 計算日期&時間間隔/推算幾天前后是哪一天
* @author 江村暮
*/
//平年
const ordinaryYearMonth: Array<any> = [null, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
//閏年
const leapYearMonth: Array<any> = [null, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
/**
* 是否為閏年
**/
const isLeap = (year: number): boolean => {
if (year % 400 === 0 && year % 100 === 0) return true
if (year % 4 === 0 && year % 100 !== 0) return true
return false
}
//解析時間串
type Num = number
const parseTime = (time: string): {
hour: Num;
min: Num
} => {
var bound: Num = time.indexOf(':')
return {
hour: parseInt(time.substring(0, bound)),
min: parseInt(time.substring(bound + 1))
}
}
//解析日期串
const parseDate = (date = '2020-03-06'): Readonly<{
year: number;
month: number;
day: number;
isLeap: boolean
}> => {
var match = /(\d{4})-(\d{2})-(\d{2})/.exec(date);
if (!match) throw Error
return {
year: parseInt(match[1]),
month: parseInt(match[2].replace(/^0/, '')),
day: parseInt(match[3].replace(/^0/, '')),
isLeap: isLeap(parseInt(match[1]))
}
}
const calDiffer = (
defaultDateEarly: string,
defaultDateLate: string,
defaultTimeEarly?: string,
defaultTimeLate?: string
): {
day: number,
hour: number,
min: number,
overflowHour: number,
overflowMin: number
} => {
var dateEarly = parseDate(defaultDateEarly)
, dateLate = parseDate(defaultDateLate)
, diffDay: number;
//兩個日期在同一年
if (dateLate.year === dateEarly.year) {
var numOfEarlyMonthDay = dateEarly.isLeap ? leapYearMonth[dateEarly.month] : ordinaryYearMonth[dateEarly.month]
// 兩個日期在同一月份
if (dateLate.month === dateEarly.month) {
diffDay = dateLate.day - dateEarly.day
} else {
diffDay = dateLate.day + numOfEarlyMonthDay - dateEarly.day;//兩個日期所在月的非整月天數和
for (let i = dateEarly.month; i < dateLate.month - 1; i++) {
diffDay += (dateLate.isLeap) ? leapYearMonth[i] : ordinaryYearMonth[i]
}
}
} else {
//這一年已過天數
var lateYearDay = dateLate.day;
for (let i = dateLate.month - 1; i >= 1; i--) {
lateYearDay += (dateLate.isLeap) ? leapYearMonth[i] : ordinaryYearMonth[i]
}
console.log(lateYearDay)
//那一年剩下天數
var earlyYearDay = 0
for (let i = 13 - dateEarly.month; i >= 1; i--) {
earlyYearDay += (dateLate.isLeap) ? leapYearMonth[i] : ordinaryYearMonth[i]
}
earlyYearDay -= dateEarly.day
console.log(earlyYearDay)
//相隔年份天數，如：年份為2010 - 2020，則計算2011 - 2019的天數
var diffYear: number[] = [];
for (let i = 0; i <= dateLate.year - dateEarly.year - 1; i++) {
diffYear.push(dateEarly.year + i + 1)
}
diffDay = earlyYearDay + lateYearDay
diffYear.map(year => {
diffDay += isLeap(year) ? 366 : 365
})
}
//計算這天剩下的時間與那天已經過的分鐘之和
var timeEarly = parseTime(defaultTimeEarly || '00:00'),
timeLate = parseTime(defaultTimeLate || '00:00');
var overflowDiffMin = 60 * (25 - timeEarly.hour + timeLate.hour) + 60 - timeEarly.min + timeLate.min
var diffMin = (diffDay - 1) * 1440 + overflowDiffMin
console.log(timeEarly, timeLate, diffMin)
return {
day: diffDay,
overflowHour: Math.floor(diffMin/60) - diffDay * 24,
overflowMin: diffMin % 60,//(overflowDiffMin - 1440 * diffDay) % 60,
hour: Math.floor(diffMin/60),
min: diffMin % 60
}
}
export { calDiffer }
