js计算两个时间相差的年、月、日、时、分、秒。

/* 时间格式：2016-8-31 10:35:00 或 2016/8/31 10:35:00 */

var dateObj=dayCha('2016-8-17','2019-6-30') //执行方法，参数为时间，第二个时间未填默认为当前时间。

方法一：

function dayCha(time, twoTime) {time = time.replace(new RegExp("-", "gm"), "/");if (twoTime) {twoTime = twoTime.replace(new RegExp("-", "gm"), "/");}else {twoTime = new Date();}// 计算比较日期const getMaxMinDate = (time, twoTime, type) => {let minTime = new Date(time).getTime() - new Date(twoTime).getTime() > 0 ? twoTime : timelet maxTime = new Date(time).getTime() - new Date(twoTime).getTime() > 0 ? time : twoTimelet maxDateDay = new Date(new Date(maxTime).getFullYear(), new Date(maxTime).getMonth() + 1, 0).getDate()let maxMinDate = new Date(minTime).getDate() > maxDateDay ? maxDateDay : new Date(minTime).getDate()let maxMinTong = nullif (type == 'month') {maxMinTong = new Date(maxTime).getFullYear() + '/' + (new Date(minTime).getMonth() + 1) + '/' + maxMinDate + ' ' + new Date(minTime).toLocaleTimeString('chinese',{hour12:false})} else {maxMinTong = new Date(maxTime).getFullYear() + '/' + (new Date(maxTime).getMonth() + 1) + '/' + maxMinDate + ' ' + new Date(minTime).toLocaleTimeString('chinese',{hour12:false})}return {minTime,maxTime,maxMinTong}}// 相差年份const getYear = (time, twoTime) => {let oneYear = new Date(time).getFullYear()let twoYear = new Date(twoTime).getFullYear()// 计算出与最小日期的日时分相同的最大日期的值// 如2016-8-17和2019-6-30,计算出来的maxMinTong为2019-8-17const { minTime, maxTime, maxMinTong } = getMaxMinDate(time, twoTime, 'month')// 计算相差多少年let chaYear = Math.abs(oneYear - twoYear)// 如果计算出的maxMinTong(如2019-8-17)大于了最大日期,则表示最后一年没有满,需要减一if (new Date(maxMinTong).getTime() > new Date(maxTime).getTime()) {chaYear--}return chaYear}const getMonthTong = (time, twoTime) => {let oneMonth = new Date(time).getFullYear() * 12 + (new Date(time).getMonth() + 1)let twoMonth = new Date(twoTime).getFullYear() * 12 + (new Date(twoTime).getMonth() + 1)return Math.abs(oneMonth - twoMonth)}// 相差月份const getMonth = (time, twoTime, value) => {// 计算出与最小日期的日时分相同的最大日期的值// 如2016-8-17和2019-6-30,计算出来的maxMinTong为2019-6-17const { minTime, maxTime, maxMinTong } = getMaxMinDate(time, twoTime, 'day')// 计算最小日期到maxMinTong(如2019-6-17)的月份,这样刚好对应月日let chaMonth = getMonthTong(minTime, maxMinTong)// 如果计算出来的maxMinTong(如2019-6-17)大于最大日期,则表示最后一月没有满,需要减一if (new Date(maxMinTong).getTime() > new Date(maxTime).getTime()) {chaMonth--}if (value) {return chaMonth - value} else {return chaMonth}}// 相差天数const getDay = (time, twoTime, value) => {let chaTime = Math.abs(new Date(time).getTime() - new Date(twoTime).getTime());if (value) {return parseInt(chaTime / 86400000) - value} else {return parseInt(chaTime / 86400000)}}// 相差小时const getHour = (time, twoTime, value) => {let chaTime = Math.abs(new Date(time).getTime() - new Date(twoTime).getTime());if (value) {return parseInt(chaTime / 3600000) - value} else {return parseInt(chaTime / 3600000)}}// 相差分钟const getMinute = (time, twoTime, value) => {let chaTime = Math.abs(new Date(time).getTime() - new Date(twoTime).getTime());if (value) {return parseInt(chaTime / 60000) - value} else {return parseInt(chaTime / 60000)}}// 相差秒const getSecond = (time, twoTime, value) => {let chaTime = Math.abs(new Date(time).getTime() - new Date(twoTime).getTime());if (value) {return parseInt(chaTime / 1000) - value} else {return parseInt(chaTime / 1000)}}// 相差年月日时分秒const getDffeYMDHMS = (time, twoTime) => {// 计算出与最小日期的日时分相同的最大日期的值// 如2016-8-17和2019-6-30,计算出来的maxMinTong为2019-6-17const { minTime, maxTime, maxMinTong } = getMaxMinDate(time, twoTime, 'day')// 计算最小日期到(如:2019-6-17)的天数,这样算出来的天数刚好数足月的let dffeDay1 = getDay(minTime, maxMinTong)// 判断一下,如果计算出来的(如:2019-6-17)大于最后的日期(如2019-6-30)就需要减去(2019-6-30到2019-6-17的天数,否则不需要)if (new Date(maxMinTong).getTime() > new Date(maxTime).getTime()) {let prevMonth = new Date(maxMinTong).getMonth() - 1let lastTime=new Date(maxMinTong).setMonth(prevMonth)dffeDay1 = dffeDay1 - getDay((new Date(lastTime).getFullYear() + '/' + (new Date(lastTime).getMonth()+1) + '/' + new Date(lastTime).getDate()), maxMinTong)}let dffeYear = getYear(time, twoTime)let dffeMonth = getMonth(time, twoTime, dffeYear * 12)let dffeDay = getDay(time, twoTime, dffeDay1)let dffeHour = getHour(time, twoTime, getDay(time, twoTime) * 24)let dffeMinute = getMinute(time, twoTime, (getDay(time, twoTime) * 24 * 60 + dffeHour * 60))let dffeSecond = getSecond(time, twoTime, (getDay(time, twoTime) * 24 * 60 * 60 + dffeHour * 60 * 60 + dffeMinute * 60))console.log(`年:${dffeYear},月:${dffeMonth},日:${dffeDay},时:${dffeHour},分:${dffeMinute},秒:${dffeSecond}`)return { dffeYear, dffeMonth, dffeDay, dffeHour, dffeMinute, dffeSecond }}// 相差年月周日时分秒const getDffeYMWDHMS = (time, twoTime) => {// 计算出与最小日期的日时分相同的最大日期的值const { minTime, maxTime, maxMinTong } = getMaxMinDate(time, twoTime, 'day')let dffeDay1 = getDay(minTime, maxMinTong)// 如果大于了,就需要减掉多余天数if (new Date(maxMinTong).getTime() > new Date(maxTime).getTime()) {let prevMonth = new Date(maxMinTong).getMonth() - 1let lastTime=new Date(maxMinTong).setMonth(prevMonth)dffeDay1 = dffeDay1 - getDay((new Date(lastTime).getFullYear() + '/' + (new Date(lastTime).getMonth()+1) + '/' + new Date(lastTime).getDate()), maxMinTong)}let dffeYear = getYear(time, twoTime)let dffeMonth = getMonth(time, twoTime, dffeYear * 12)let dffeDayZong = getDay(time, twoTime, dffeDay1)let dffeWeek = parseInt(dffeDayZong / 7)let dffeDay = dffeDayZong - dffeWeek * 7let dffeHour = getHour(time, twoTime, getDay(time, twoTime) * 24)let dffeMinute = getMinute(time, twoTime, (getDay(time, twoTime) * 24 * 60 + dffeHour * 60))let dffeSecond = getSecond(time, twoTime, (getDay(time, twoTime) * 24 * 60 * 60 + dffeHour * 60 * 60 + dffeMinute * 60))console.log(`年:${dffeYear},月:${dffeMonth},周:${dffeWeek},日:${dffeDay},时:${dffeHour},分:${dffeMinute},秒:${dffeSecond}`)return { dffeYear, dffeMonth, dffeWeek, dffeDay, dffeHour, dffeMinute, dffeSecond }}let chaYear = getYear(time, twoTime)let chaMonth = getMonth(time, twoTime)let chaDay = getDay(time, twoTime)let chaHour = getHour(time, twoTime)let chaMinute = getMinute(time, twoTime)let chaSecond = getSecond(time, twoTime)return {chaYear, chaMonth, chaDay, chaHour, chaMinute, chaSecond,getDffeYMDHMS: getDffeYMDHMS(time, twoTime),getDffeYMWDHMS: getDffeYMWDHMS(time, twoTime)}}

具体详细解说

方法二：

function dayCha(startime,endtime){startime = startime.replace(new RegExp("-","gm"),"/");//转换-变为/endtime = endtime.replace(new RegExp("-","gm"),"/");var minTime = new Date(startime).getTime()>new Date(endtime).getTime()?endtime:startimevar maxTime = new Date(startime).getTime()>new Date(endtime).getTime()?startime:endtimevar start       = new Date(minTime);var startYear   = start.getFullYear(); //开始年份var startMonth  = start.getMonth() + 1;//开始月份var end      = new Date(maxTime);var endYear  = end.getFullYear(); //结束年份var endMonth = end.getMonth() + 1;//结束月份//  年var mideleYear=new Date(minTime)mideleYear.setFullYear(endYear)var years = Math.abs(mideleYear.getFullYear() - start.getFullYear());if(mideleYear.getTime()>end.getTime()){years--}// 月
var mideleMonthDay = new Date(minTime)
mideleMonthDay.setFullYear(endYear)
mideleMonthDay.setMonth(endMonth-1)
console.log(mideleMonthDay.toLocaleDateString())
var months = (endYear*12+endMonth) - (startYear*12+startMonth) - years*12
if(mideleMonthDay.getTime()>end.getTime()){months--
}// 日
var day = (Math.floor((end.getTime() - start.getTime()) / 24 / 60/ 60 / 1000))
if(end.getTime()> mideleMonthDay.getTime()){day = (Math.floor( (end.getTime() - mideleMonthDay.getTime()) / 24 / 60/ 60 / 1000)) - day
}else{let prevMonthDay = new Date(mideleMonthDay)prevMonthDay.setMonth(endMonth-2)day = (Math.floor((end.getTime() - prevMonthDay.getTime()) / 24 / 60/ 60 / 1000))
}var chaTime = end.getTime() - start.getTime()var chaDay = Math.floor(chaTime / 24 / 60/ 60 / 1000)var hour = Math.floor(chaTime / 60/ 60 / 1000) - chaDay*24var min = Math.floor(chaTime / 60 / 1000) - chaDay*24*60 - hour*60var sec =  Math.floor(chaTime / 1000) - chaDay*24*60*60 - hour*60*60 - min*60var chastr = years+'年/'+months+'月/'+day+'天 '+hour+'时:'+min+'分:'+sec+'秒';console.log('相差时间：'+chastr);
}

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