JavaScript日期工具类DateUtils定义与用法示例

DateUtils = {  patterns: {   PATTERN_ERA: 'G', //Era 标志符 Era strings. For example: "AD" and "BC"   PATTERN_YEAR: 'y', //年   PATTERN_MONTH: 'M', //月份   PATTERN_DAY_OF_MONTH: 'd', //月份的天数   PATTERN_HOUR_OF_DAY1: 'k', //一天中的小时数（1-24）   PATTERN_HOUR_OF_DAY0: 'H', //24小时制，一天中的小时数（0-23）   PATTERN_MINUTE: 'm', //小时中的分钟数   PATTERN_SECOND: 's', //秒   PATTERN_MILLISECOND: 'S', //毫秒   PATTERN_DAY_OF_WEEK: 'E', //一周中对应的星期，如星期一，周一   PATTERN_DAY_OF_YEAR: 'D', //一年中的第几天   PATTERN_DAY_OF_WEEK_IN_MONTH: 'F', //一月中的第几个星期(会把这个月总共过的天数除以7,不够准确，推荐用W)   PATTERN_WEEK_OF_YEAR: 'w', //一年中的第几个星期   PATTERN_WEEK_OF_MONTH: 'W', //一月中的第几星期(会根据实际情况来算)   PATTERN_AM_PM: 'a', //上下午标识   PATTERN_HOUR1: 'h', //12小时制 ，am/pm 中的小时数（1-12）   PATTERN_HOUR0: 'K', //和h类型   PATTERN_ZONE_NAME: 'z', //时区名   PATTERN_ZONE_VALUE: 'Z', //时区值   PATTERN_WEEK_YEAR: 'Y', //和y类型   PATTERN_ISO_DAY_OF_WEEK: 'u',   PATTERN_ISO_ZONE: 'X'  },  week: {   'ch': {    "0": "/u65e5",    "1": "/u4e00",    "2": "/u4e8c",    "3": "/u4e09",    "4": "/u56db",    "5": "/u4e94",    "6": "/u516d"   },   'en': {    "0": "Sunday",    "1": "Monday",    "2": "Tuesday",    "3": "Wednesday",    "4": "Thursday",    "5": "Friday",    "6": "Saturday"   }  },  //获取当前时间  getCurrentTime: function() {   var today = new Date();   var year = today.getFullYear();   var month = today.getMonth() + 1;   var day = today.getDate();   var hours = today.getHours();   var minutes = today.getMinutes();   var seconds = today.getSeconds();   var timeString = year + "-" + month + "-" + day + " " + hours + ":" + minutes + ":" + seconds;   return timeString;  },  /*   * 比较时间大小   * time1>time2 return 1   * time1<time2 return -1   * time1==time2 return 0   */  compareTime: function(time1, time2) {   if(Date.parse(time1.replace(/-/g, "/")) > Date.parse(time2.replace(/-/g, "/"))) {    return 1;   } else if(Date.parse(time1.replace(/-/g, "/")) < Date.parse(time2.replace(/-/g, "/"))) {    return -1;   } else if(Date.parse(time1.replace(/-/g, "/")) == Date.parse(time2.replace(/-/g, "/"))) {    return 0;   }  },  //是否闰年  isLeapYear: function(year) {   return((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0);  },  //获取某个月的天数，从0开始  getDaysOfMonth: function(year, month) {   return [31, (this.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];  },  getDaysOfMonth2: function(year, month) {   // 将天置为0，会获取其上个月的最后一天   month = parseInt(month) + 1;   var date = new Date(year, month, 0);   return date.getDate();  },  /*距离现在几天的日期：负数表示今天之前的日期，0表示今天，整数表示未来的日期   * 如-1表示昨天的日期，0表示今天，2表示后天   */  fromToday: function(days) {   var today = new Date();   today.setDate(today.getDate() + days);   var date = today.getFullYear() + "-" + (today.getMonth() + 1) + "-" + today.getDate();   return date;  },  /**   * 日期时间格式化   * @param {Object} dateTime 需要格式化的日期时间   * @param {String} pattern 格式化的模式，如yyyy-MM-dd hh(HH):mm:ss.S a k K E D F w W z Z   */  formt: function(dateTime, pattern) {   var date = new Date(dateTime);   if(Bee.StringUtils.isBlank(pattern)) {    return date.toLocaleString();   }   return pattern.replace(/([a-z])/1*/ig, function(matchStr, group1) {    var replacement = "";    switch(group1) {     case Bee.DateUtils.patterns.PATTERN_ERA: //G      break;     case Bee.DateUtils.patterns.PATTERN_WEEK_YEAR: //Y     case Bee.DateUtils.patterns.PATTERN_YEAR: //y      replacement = date.getFullYear();      break;     case Bee.DateUtils.patterns.PATTERN_MONTH: //M      var month = date.getMonth() + 1;      replacement = (month < 10 && matchStr.length >= 2) ? "0" + month : month;      break;     case Bee.DateUtils.patterns.PATTERN_DAY_OF_MONTH: //d      var days = date.getDate();      replacement = (days < 10 && matchStr.length >= 2) ? "0" + days : days;      break;     case Bee.DateUtils.patterns.PATTERN_HOUR_OF_DAY1: //k(1~24)      var hours24 = date.getHours();      replacement = hours24;      break;     case Bee.DateUtils.patterns.PATTERN_HOUR_OF_DAY0: //H(0~23)      var hours24 = date.getHours();      replacement = (hours24 < 10 && matchStr.length >= 2) ? "0" + hours24 : hours24;      break;     case Bee.DateUtils.patterns.PATTERN_MINUTE: //m      var minutes = date.getMinutes();      replacement = (minutes < 10 && matchStr.length >= 2) ? "0" + minutes : minutes;      break;     case Bee.DateUtils.patterns.PATTERN_SECOND: //s      var seconds = date.getSeconds();      replacement = (seconds < 10 && matchStr.length >= 2) ? "0" + seconds : seconds;      break;     case Bee.DateUtils.patterns.PATTERN_MILLISECOND: //S      var milliSeconds = date.getMilliseconds();      replacement = milliSeconds;      break;     case Bee.DateUtils.patterns.PATTERN_DAY_OF_WEEK: //E      var day = date.getDay();      replacement = Bee.DateUtils.week['ch'][day];      break;     case Bee.DateUtils.patterns.PATTERN_DAY_OF_YEAR: //D      replacement = Bee.DateUtils.dayOfTheYear(date);      break;     case Bee.DateUtils.patterns.PATTERN_DAY_OF_WEEK_IN_MONTH: //F      var days = date.getDate();      replacement = Math.floor(days / 7);      break;     case Bee.DateUtils.patterns.PATTERN_WEEK_OF_YEAR: //w      var days = Bee.DateUtils.dayOfTheYear(date);      replacement = Math.ceil(days / 7);      break;     case Bee.DateUtils.patterns.PATTERN_WEEK_OF_MONTH: //W      var days = date.getDate();      replacement = Math.ceil(days / 7);      break;     case Bee.DateUtils.patterns.PATTERN_AM_PM: //a      var hours24 = date.getHours();      replacement = hours24 < 12 ? "/u4e0a/u5348" : "/u4e0b/u5348";      break;     case Bee.DateUtils.patterns.PATTERN_HOUR1: //h(1~12)      var hours12 = date.getHours() % 12 || 12; //0转为12      replacement = (hours12 < 10 && matchStr.length >= 2) ? "0" + hours12 : hours12;      break;     case Bee.DateUtils.patterns.PATTERN_HOUR0: //K(0~11)      var hours12 = date.getHours() % 12;      replacement = hours12;      break;     case Bee.DateUtils.patterns.PATTERN_ZONE_NAME: //z      replacement = Bee.DateUtils.getZoneNameValue(date)['name'];      break;     case Bee.DateUtils.patterns.PATTERN_ZONE_VALUE: //Z      replacement = Bee.DateUtils.getZoneNameValue(date)['value'];      break;     case Bee.DateUtils.patterns.PATTERN_ISO_DAY_OF_WEEK: //u      break;     case Bee.DateUtils.patterns.PATTERN_ISO_ZONE: //X      break;     default:      break;    }    return replacement;   });  },  /**   * 计算一个日期是当年的第几天   * @param {Object} date   */  dayOfTheYear: function(date) {   var obj = new Date(date);   var year = obj.getFullYear();   var month = obj.getMonth(); //从0开始   var days = obj.getDate();   var daysArr = [31, (this.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];   for(var i = 0; i < month; i++) {    days += daysArr[i];   }   return days;  },  //获得时区名和值  getZoneNameValue: function(dateObj) {   var date = new Date(dateObj);   date = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));   var arr = date.toString().match(/([A-Z]+)([-+]/d+:?/d+)/);   var obj = {    'name': arr[1],    'value': arr[2]   };   return obj;  }};//用法示例console.log(DateUtils.getCurrentTime())//获取当前时间console.log(DateUtils.compareTime('2018-8-1','2018-9-3'))//比较时间console.log(DateUtils.isLeapYear('2018'))//是否闰年console.log(DateUtils.getDaysOfMonth('2018','9'))//获取指定月份的天数（从0计数）console.log(DateUtils.dayOfTheYear('2018-9-3'))//计算指定日期是当年第几天