JavaScript日期工具类DateUtils定义与用法示例

本文实例讲述了javascript日期工具类dateutils定义与用法。分享给大家供大家参考，具体如下：

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

使用在线html/css/javascript代码运行工具：http://tools.jb51.net/code/htmljsrun测试运行结果如下：

ps：这里再为大家推荐几款比较实用的天数计算在线工具供大家使用：

在线日期/天数计算器：

在线日期计算器/相差天数计算器：

在线日期天数差计算器：

在线天数计算器：

更多关于javascript相关内容感兴趣的读者可查看本站专题：《javascript时间与日期操作技巧总结》、《javascript+html5特效与技巧汇总》、《javascript错误与调试技巧总结》、《javascript数据结构与算法技巧总结》及《javascript数学运算用法总结》

希望本文所述对大家javascript程序设计有所帮助。