虽然现在处理日期方面已经有了很成熟的也很好用的库，例如（momentjs和date-fns），但是在实际开发中，我们有时候可能并不需要整个库。所以我就在下面整理了在前端开发时对日期时间的各种操作，也算是比较全的了。其中一部分来自自己，还有一部分来源于我们万能的网友~
获取当前时间戳var timestamp = Date.parse(new Date()); //精确到秒var timestamp = (new Date()).valueOf(); //精确到毫秒var timestamp = new Date().getTime(); //精确到毫秒var timestamp = +new Date();var timestamp = Date.now(); 获取指定时间戳 var timestamp = (new Date(" 2019/10/24 08:00:00")).getTime();var timestamp = (new Date(" 2019-10-24 08:00:00")).getTime(); 获取当前时间的前一天/后一天的时间戳 var timestamp = +new Date() - 24*60*60*1000;var timestamp = +new Date() + 24*60*60*1000; 今日零点时间戳 var timestamp = new Date(new Date().toLocaleDateString()).getTime(); 今日最晚时间 23:59:59的时间戳 let timestamp = new Date(new Date().toLocaleDateString()).getTime()+24*60*60*1000-1; 获取当前时间的n天后的时间戳 function tonextTimes(n){ let timestamp = +new Date() + n * 86400000; return timestamp;} 本周第一天 function showWeekFirstDay(){ let Nowdate=new Date(); let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000); return WeekFirstDay;} 本周最后一天 function showWeekLastDay(){ let Nowdate=new Date(); let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000); let WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000); return WeekLastDay;} 本月第一天 function showMonthFirstDay(){ let Nowdate=new Date(); let MonthFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth()); return MonthFirstDay;} 本月最后一天 function showMonthLastDay(){ let Nowdate=new Date(); let MonthNextFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth()+1); let MonthLastDay=new Date(MonthNextFirstDay-86400000); return MonthLastDay;} 日期转时间戳 function timeToTimestamp (time) { let date = new Date(time); let timestamp = date.getTime(); return timestamp;} 格式化当前时间 function getdataTimeSec() { let time = new Date(); let weekDay; let year = time.getFullYear(); let month = time.getMonth() + 1; let day = time.getDate(); //获取时分秒 let h = time.getHours(); let m = time.getMinutes(); let s = time.getSeconds(); //检查是否小于10 h = check(h); m = check(m); s = check(s); let now_day = time.getDay(); switch (now_day) { case 0: { weekDay = "星期日" } break; case 1: { weekDay = "星期一" } break; case 2: { weekDay = "星期二" } break; case 3: { weekDay = "星期三" } break; case 4: { weekDay = "星期四" } break; case 5: { weekDay = "星期五" } break; case 6: { weekDay = "星期六" } break; case 7: { weekDay = "星期日" } break; } let timeText = year + "年" + month + "月" + day + "日 " + " " + weekDay + " " + h + ":" + m +":" + s; return timeText} 返回指定时间戳之间的时间间隔 function getTimeInterval(startTime, endTime) { let runTime = parseInt((endTime - startTime) / 1000); let year = Math.floor(runTime / 86400 / 365); runTime = runTime % (86400 * 365); let month = Math.floor(runTime / 86400 / 30); runTime = runTime % (86400 * 30); let day = Math.floor(runTime / 86400); runTime = runTime % 86400; let hour = Math.floor(runTime / 3600); runTime = runTime % 3600; let minute = Math.floor(runTime / 60); runTime = runTime % 60; let second = runTime; let str = \'\'; if (year > 0) { str = year + \'年\'; } if (year <= 0 && month > 0) { str = month + \'月\'; } if (year <= 0 && month <= 0 && day > 0) { str = day + \'天\'; } if (year <= 0 && month <= 0 && day <= 0 && hour > 0) { str = hour + \'小时\'; } if (year <= 0 && month <= 0 && day <= 0 && hour <= 0 && minute > 0) { str = minute + \'分钟\'; } if (year <= 0 && month <= 0 && day <= 0 && hour <= 0 && minute <= 0 && second > 0) { str += second + \'秒\'; } str += \'前\'; return str;} 按类型格式化日期 function getFormatDate(date, dateType) { let dateObj = new Date(date); let month = dateObj.getMonth() + 1; let strDate = dateObj.getDate(); let hours = dateObj.getHours(); let minutes = dateObj.getMinutes(); let seconds = dateObj.getSeconds(); if (month >= 1 && month <= 9) { month = "0" + month; } if (strDate >= 0 && strDate <= 9) { strDate = "0" + strDate; } if (hours >= 0 && hours <= 9) { hours = "0" + hours } if (minutes >= 0 && minutes <= 9) { minutes = "0" + minutes } if (seconds >= 0 && seconds <= 9) { seconds = "0" + seconds } let dateText = dateObj.getFullYear() + \'年\' + (dateObj.getMonth() + 1) + \'月\' + dateObj.getDate() + \'日\'; if (dateType == "yyyy-mm-dd") { dateText = dateObj.getFullYear() + \'-\' + (dateObj.getMonth() + 1) + \'-\' + dateObj.getDate(); } if (dateType == "yyyy.mm.dd") { dateText = dateObj.getFullYear() + \'.\' + (dateObj.getMonth() + 1) + \'.\' + dateObj.getDate(); } if (dateType == "yyyy-mm-dd MM:mm:ss") { dateText = dateObj.getFullYear() + \'-\' + month + \'-\' + strDate + \' \' + hours + ":" + minutes + ":" + seconds; } if (dateType == "mm-dd MM:mm:ss") { dateText = month + \'-\' + strDate + \' \' + hours + ":" + minutes + ":" + seconds; } if (dateType == "yyyy年mm月dd日 MM:mm:ss") { dateText = dateObj.getFullYear() + \'年\' + month + \'月\' + strDate + \'日\' + \' \' + hours + ":" + minutes + ":" + seconds; } return dateText; } 判断是否为闰年 function leapYear(year) { return !(year % (year % 100 ? 4 : 400));} 返回两个年份之间的闰年 function leapYears(start, end) { let arr = []; for (var i=start; i 判断时间格式是否有效 function isTime(str) { var a = str.match(/^(d{1,2})(:)?(d{1,2})2(d{1,2})$/); if (a == null) { return false; } if (a[1] >= 24 || a[3] >= 60 || a[4] >= 60) { return false } return true;}function strDateTime(str){ var result = str.match(/^(d{1,4})(-|/)(d{1,2})2(d{1,2})$/); if (result == null) return false; var d = new Date(result[1], result[3] - 1, result[4]); return (d.getFullYear() == result[1] && d.getMonth() + 1 == result[3] && d.getDate() == result[4]);}function strDateTime(str){ var result = str.match(/^(d{4})(-|/)(d{1,2})2(d{1,2}) (d{1,2}):(d{1,2}):(d{1,2})$/); if (result == null) return false; var d = new Date(result[1], result[3] - 1, result[4], result[5], result[6], result[7]); return (d.getFullYear() == result[1] && (d.getMonth() + 1) == result[3] && d.getDate() == result[4] && d.getHours() == result[5] && d.getMinutes() == result[6] && d.getSeconds() == result[7]);} 验证日期大小 function compareDate(d1, d2) { return ((new Date(d1.replace(/-/g, "/"))) < (new Date(d2.replace(/-/g, "/"))));} 验证一个日期是不是今天 function isToday(val){ return new Date().toLocaleDateString() == new Date(val).toLocaleDateString();} 验证传入的日期是否是昨天 function isYesterday(val) { var today = new Date(); var yesterday = new Date(now - 1000 * 60 * 60 * 24); var test = new Date(val); if (yesterday.getYear() === test.getYear() && yesterday.getMonth() === test.getMonth() && yesterday.getDate() === test.getDate()) { return true; } else { return false; }} 设置几天后的日期 function convertDate (date, day) { let tempDate = new Date(date); tempDate.setDate(tempDate.getDate()+day); let Y = tempDate.getFullYear(); let M = tempDate.getMonth()+1 < 10 ? \'0\'+(tempDate.getMonth()+1) : tempDate.getMonth()+1; let D = tempDate.getDate() < 10 ? \'0\'+(tempDate.getDate()) : tempDate.getDate(); let result = Y + "-" + M + "-" + D return result;} 写在最后 若上面函数有错误，或者还有工作中遇到，但是上面没有写到的，欢迎指出来~
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