简单谈谈javascript Date类型

1 创建一个新的日期对象，如果不带参数，则对象自动获得当前的日期和时间

var d = new Date()

2 如果需要指定特定的日期，则可以通过Date.parse() 或者 Date().UTC(),返回时间戳作为 new Date()的参数

Date.parse() 用法：

var time = Date.parse('2015/05/20');
var newDate = new Date(time);//Wed May 20 2015 00:00:00 GMT+0800 (中国标准时间)
//转换为格林威治时间
newDate.toUTCString(); //Tue, 19 May 2015 16:00:00 GMT

也可以直接 new Date('2015/05/20') 指定日期，new Date() 构造函数会自动调用 Date.parse()静态方法。

Date.UTC()

Date.UTC()的参数分别是年，月（从0到11），日（1-31），时（0-23），分（0-59），秒（0-59），毫秒（0-999），最少参数2个，即应该包含年月，其他不填的默认为0。

如果要创建的时间为中国标准时间的2015年5月20日,则代码应表示为

var myDate = new Date(Date.UTC(2015,5,19,16,0,0)) //Sat Jun 20 2015 00:00:00 GMT+0800
//格林威治时间
myDate.toUTCString() // Fri, 19 Jun 2015 16:00:00 GMT

 其他：

var d = new Date();
//年
d.getFullYear() 
//月
d.getMonth()
//日
d.getDate()

下面我们通过具体的示例来看看

 

 
Date.isValiDate = function(dateStr, formatStr) 
{ 
  if(!dateStr){ 
    return false; 
  } 
  if(!formatStr){ 
    formatStr = "yyyy-MM-dd";//默认格式：yyyy-MM-dd 
  } 
  if(dateStr.length!=formatStr.length){ 
    return false; 
  }else{ 
    if(formatStr=="yyyy-MM-dd"||formatStr=="YYYY-MM-DD"){ 
      var r1=/^(((((([02468][048])|([13579][26]))(00))|(d{2}(([02468][48])|([13579][26]))))-((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-([0-2][0-9]))))|(d{2}(([02468][1235679])|([13579][01345789]))-((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-(([0-1][0-9])|(2[0-8]))))))$/; 
      return r1.test(dateStr); 
    }else if(formatStr=="yyyy/MM/dd"||formatStr=="YYYY/MM/DD"){ 
      var r2=/^(((((([02468][048])|([13579][26]))(00))|(d{2}(([02468][48])|([13579][26]))))/((((0[13578])|(1[02]))/(([0-2][0-9])|(3[01])))|(((0[469])|(11))/(([0-2][0-9])|(30)))|(02/([0-2][0-9]))))|(d{2}(([02468][1235679])|([13579][01345789]))/((((0[13578])|(1[02]))/(([0-2][0-9])|(3[01])))|(((0[469])|(11))/(([0-2][0-9])|(30)))|(02/(([0-1][0-9])|(2[0-8]))))))$/; 
      return r2.test(dateStr); 
    }else if(formatStr=="MM-dd-yyyy"||formatStr=="MM-DD-YYYY"){ 
      var r3=/^((((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-([0-2][0-9])))-(((([02468][048])|([13579][26]))(00))|(d{2}(([02468][48])|([13579][26])))))|(((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-(([0-1][0-9])|(2[0-8])))))-d{2}(([02468][1235679])|([13579][01345789])))$/; 
      return r3.test(dateStr); 
    }else if(formatStr=="MM/dd/yyyy"||formatStr=="MM/DD/YYYY"){ 
      var r4=/^((((((0[13578])|(1[02]))/(([0-2][0-9])|(3[01])))|(((0[469])|(11))/(([0-2][0-9])|(30)))|(02/([0-2][0-9])))/(((([02468][048])|([13579][26]))(00))|(d{2}(([02468][48])|([13579][26])))))|(((((0[13578])|(1[02]))/(([0-2][0-9])|(3[01])))|(((0[469])|(11))/(([0-2][0-9])|(30)))|(02/(([0-1][0-9])|(2[0-8])))))/d{2}(([02468][1235679])|([13579][01345789])))$/; 
      return r4.test(dateStr); 
    }else{ 
      alert("日期格式不正确！"); 
      return false; 
    } 
  } 
  return false; 
} 

 
Date.isValiTime = function(timeStr, formatStr) 
{ 
  if(!timeStr){ 
    return false; 
  } 
  if(!formatStr){ 
    formatStr = "hh:mm:ss";//默认格式：hh:mm:ss 
  } 
  if(timeStr.length!=formatStr.length){ 
    return false; 
  }else{ 
    if(formatStr=="hh:mm:ss"){ 
      var r1=/^(([0-1][0-9])|(2[0-3])):([0-5][0-9]):([0-5][0-9])$/; 
      return r1.test(timeStr); 
    }else if(formatStr=="hh-mm-ss"){ 
      var r2=/^(([0-1][0-9])|(2[0-3]))-([0-5][0-9])-([0-5][0-9])$/; 
      return r2.test(timeStr); 
    }else if(formatStr=="hh/mm/ss"){ 
      var r3=/^(([0-1][0-9])|(2[0-3]))/([0-5][0-9])/([0-5][0-9])$/; 
      return r3.test(timeStr); 
    }else{ 
      alert("时间格式不正确！"); 
      return false; 
    } 
  } 
  return false; 
} 

 
Date.isValiDateTime = function(dateTimeStr) 
{ 
  var dateTimeReg=/^(((((([02468][048])|([13579][26]))(00))|(d{2}(([02468][48])|([13579][26]))))-((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-([0-2][0-9]))))|(d{2}(([02468][1235679])|([13579][01345789]))-((((0[13578])|(1[02]))-(([0-2][0-9])|(3[01])))|(((0[469])|(11))-(([0-2][0-9])|(30)))|(02-(([0-1][0-9])|(2[0-8]))))))(s{1}(([0-1][0-9])|(2[0-3])):([0-5][0-9]):([0-5][0-9]))?$/ 
  return dateTimeReg.test(dateTimeStr); 
} 

 
Date.prototype.isLeapYear = function() 
{ 
  return (this.getYear()%4==0&&((this.getYear()%100!=0)||(this.getYear()%400==0))); 
} 

 
Date.prototype.format = function(formatStr) 
{ 
  var str = formatStr; 
  if(!formatStr){ 
    str = "yyyy-MM-dd hh:mm:ss";//默认格式 
  } 
  var Week = ['日','一','二','三','四','五','六']; 
   
  str=str.replace(/yyyy|YYYY/,this.getFullYear()); 
  str=str.replace(/yy|YY/,(this.getYear() % 100)>9?(this.getYear() % 100).toString():'0' + (this.getYear() % 100)); 
   
  str=str.replace(/MM/,this.getMonth()>=9?(parseInt(this.getMonth())+1).toString():'0' + (parseInt(this.getMonth())+1)); 
  str=str.replace(/M/g,(parseInt(this.getMonth())+1)); 
   
  str=str.replace(/w|W/g,Week[this.getDay()]); 
   
  str=str.replace(/dd|DD/,this.getDate()>9?this.getDate().toString():'0' + this.getDate()); 
  str=str.replace(/d|D/g,this.getDate()); 
   
  str=str.replace(/hh|HH/,this.getHours()>9?this.getHours().toString():'0' + this.getHours()); 
  str=str.replace(/h|H/g,this.getHours()); 
  str=str.replace(/mm/,this.getMinutes()>9?this.getMinutes().toString():'0' + this.getMinutes()); 
  str=str.replace(/m/g,this.getMinutes()); 
   
  str=str.replace(/ss|SS/,this.getSeconds()>9?this.getSeconds().toString():'0' + this.getSeconds()); 
  str=str.replace(/s|S/g,this.getSeconds()); 
   
  str=str.replace(/iii/g,this.getMilliseconds()<10?'00'+this.getMilliseconds():(this.getMilliseconds()<100?'0'+this.getMilliseconds():this.getMilliseconds())); 
   
  return str; 
} 

 
Date.stringToDate = function(dateStr) 
{ 
  if(!dateStr){ 
    alert("字符串无法解析为日期"); 
    return null; 
  }else{ 
    if(Date.isValiDate(dateStr,"yyyy/MM/dd")||Date.isValiDate(dateStr,"MM/dd/yyyy")){ 
      return new Date(Date.parse(dateStr)); 
    }else{ 
      if((!-[1,])){//IE 
 if(Date.isValiDate(dateStr,"MM-dd-yyyy")){ 
   return new Date(Date.parse(dateStr)); 
 }else{ 
   alert("字符串无法解析为日期"); 
   return null; 
 } 
      }else{//非IE 
 if(Date.isValiDate(dateStr,"yyyy-MM-dd")){ 
   return new Date(Date.parse(dateStr)); 
 }else{ 
   alert("字符串无法解析为日期"); 
   return null; 
 } 
      } 
    } 
  } 
  return null; 
} 

 
Date.daysBetween = function(dateOne,dateTwo) 
{ 
  if((dateOne instanceof Date)==false||(dateTwo instanceof Date)==false){ 
    return 0; 
  }else{ 
    return Math.abs(Math.floor((dateOne.getTime()-dateTwo.getTime())/1000/60/60/24)); 
  } 
} 

 
Date.prototype.dateAdd = function(num, field) 
{ 
  if((!num)||isNaN(num)||parseInt(num)==0){ 
    return this; 
  } 
  if(!field){ 
    field = "d"; 
  } 
  switch(field){ 
    case 'Y': 
    case 'y':return new Date((this.getFullYear()+num), this.getMonth(), this.getDate(), this.getHours(), this.getMinutes(), this.getSeconds());break; 
    case 'Q': 
    case 'q':return new Date(this.getFullYear(), (this.getMonth()+num*3), this.getDate(), this.getHours(), this.getMinutes(), this.getSeconds());break; 
    case 'M':return new Date(this.getFullYear(), this.getMonth()+num, this.getDate(), this.getHours(), this.getMinutes(), this.getSeconds());break; 
    case 'W': 
    case 'w':return new Date(Date.parse(this) + ((86400000 * 7) * num));break; 
    case 'D': 
    case 'd':return new Date(Date.parse(this) + (86400000 * num));break; 
    case 'H': 
    case 'h':return new Date(Date.parse(this) + (3600000 * num));break; 
    case 'm':return new Date(Date.parse(this) + (60000 * num));break; 
    case 'S': 
    case 's':return new Date(Date.parse(this) + (1000 * num));break; 
    default: return this; 
  } 
  return this; 
} 

 
Date.prototype.dateDiff = function(dtEnd, field) 
{ 
  var dtStart = this; 
  if((dtEnd instanceof Date)==false){ 
    return 0; 
  }else{ 
    if(!field){ 
      field = "d"; 
    } 
    switch(field){ 
      case 'Y': 
      case 'y':return dtEnd.getFullYear() - dtStart.getFullYear();break; 
      case 'M':return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1);break; 
      case 'W': 
      case 'w':return parseInt((dtEnd - dtStart) / (86400000 * 7));break; 
      case 'D': 
      case 'd':return parseInt((dtEnd - dtStart) / 86400000);break; 
      case 'H': 
      case 'h':return parseInt((dtEnd - dtStart) / 3600000);break; 
      case 'm':return parseInt((dtEnd - dtStart) / 60000);break; 
      case 'S': 
      case 's':return parseInt((dtEnd - dtStart) / 1000);break; 
      default: return 0; 
    } 
    return 0; 
  } 
} 

 
Date.prototype.toArray = function() 
{ 
  var myArray = new Array(); 
  myArray[0] = this.getFullYear(); 
  myArray[1] = this.getMonth(); 
  myArray[2] = this.getDate(); 
  myArray[3] = this.getHours(); 
  myArray[4] = this.getMinutes(); 
  myArray[5] = this.getSeconds(); 
  return myArray; 
} 

 
Date.prototype.datePart = function(field) 
{ 
  if(!field){ 
    field = "d"; 
  } 
  var Week = ['日','一','二','三','四','五','六']; 
  switch (field){ 
    case 'Y' : 
    case 'y' :return this.getFullYear();break; 
    case 'M' :return (this.getMonth()+1);break; 
    case 'W' : 
    case 'w' :return Week[this.getDay()];break; 
    case 'D' : 
    case 'd' :return this.getDate();break; 
    case 'H' : 
    case 'h' :return this.getHours();break; 
    case 'm' :return this.getMinutes();break; 
    case 's' :return this.getSeconds();break; 
    default:return this.getDate(); 
  } 
  return this.getDate(); 
}