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Briefly talk about javascript Date type_javascript skills

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Release： 2016-05-16 15:40:45
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1 Create a new date object. If there are no parameters, the object automatically obtains the current date and time

var d = new Date()
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2 If you need to specify a specific date, you can use Date.parse() or Date().UTC() to return the timestamp as a parameter of new Date()

Date.parse() usage: 

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
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You can also directly specify the date with new Date('2015/05/20'), and the new Date() constructor will automatically call the Date.parse() static method.

Date.UTC()

The parameters of Date.UTC() are year, month (from 0 to 11), day (1-31), hour (0-23), minute (0-59), second (0-59), Milliseconds (0-999), at least 2 parameters, which should include year and month, and the default is 0 if not filled in otherwise.

If the time to be created is May 20, 2015, China Standard Time, the code should be expressed as 

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
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Others: 

var d = new Date();
//年
d.getFullYear() 
//月
d.getMonth()
//日
d.getDate()
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Let’s take a look at it through specific examples

/** 
 * 日期时间脚本库方法列表： 
 * （1）Date.isValiDate：日期合法性验证 
 * （2）Date.isValiTime：时间合法性验证 
 * （3）Date.isValiDateTime：日期和时间合法性验证 
 * （4）Date.prototype.isLeapYear：判断是否闰年 
 * （5）Date.prototype.format：日期格式化 
 * （6）Date.stringToDate：字符串转成日期类型 
 * （7）Date.daysBetween：计算两个日期的天数差 
 * （8）Date.prototype.dateAdd：日期计算，支持正负数 
 * （9）Date.prototype.dateDiff：比较日期差：比较两个时期相同的字段，返回相差值 
 * （10）Date.prototype.toArray：把日期分割成数组：按数组序号分别为：年月日时分秒 
 * （11）Date.prototype.datePart：取得日期数据信息 
 */ 

/** 
 * 日期合法性验证：判断dataStr是否符合formatStr指定的日期格式 
 * 示例： 
 * （1）alert(Date.isValiDate('2008-02-29','yyyy-MM-dd'));//true 
 * （2）alert(Date.isValiDate('aaaa-58-29','yyyy-MM-dd'));//false 
 * dateStr：必选，日期字符串 
 * formatStr：可选，格式字符串，可选格式有：(1)yyyy-MM-dd(默认格式)或YYYY-MM-DD (2)yyyy/MM/dd或YYYY/MM/DD (3)MM-dd-yyyy或MM-DD-YYYY (4)MM/dd/yyyy或MM/DD/YYYY 
 */ 
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; 
} 

/** 
 * 时间合法性验证：判断timeStr是否符合formatStr指定的时间格式 
 * 示例： 
 * （1）alert(Date.isValiTime('23:59:59','hh:mm:ss'));//true 
 * （2）alert(Date.isValiTime('24-68-89','hh:mm:ss'));//false 
 * timeStr：必选，日期字符串 
 * formatStr：可选，格式字符串，可选格式有：(1)hh:mm:ss(默认格式) (2)hh-mm-ss (3)hh/mm/ss 
 */ 
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; 
} 

/** 
 * 日期和时间合法性验证 
 * 格式：yyyy-MM-dd hh:mm:ss 
 */ 
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); 
} 

/** 
 * 判断闰年 ：一般规律为：四年一闰，百年不闰，四百年再闰。 
 */ 
Date.prototype.isLeapYear = function() 
{ 
  return (this.getYear()%4==0&&((this.getYear()%100!=0)||(this.getYear()%400==0))); 
} 

/** 
 * 日期格式化： 
 * formatStr：可选，格式字符串，默认格式：yyyy-MM-dd hh:mm:ss 
 * 约定如下格式： 
 * （1）YYYY/yyyy/YY/yy 表示年份 
 * （2）MM/M 月份 
 * （3）W/w 星期 
 * （4）dd/DD/d/D 日期 
 * （5）hh/HH/h/H 时间 
 * （6）mm/m 分钟 
 * （7）ss/SS/s/S 秒 
 * （8）iii 毫秒 
 */ 
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&#63;'00'+this.getMilliseconds():(this.getMilliseconds()<100&#63;'0'+this.getMilliseconds():this.getMilliseconds())); 
   
  return str; 
} 

/** 
 * 字符串转成日期类型： 
 * dateStr：必选，日期字符串，如果无法解析成日期类型，返回null 
 * 格式： 
 * （1）yyyy/MM/dd：IE和FF通用 
 * （2）MM/dd/yyyy：IE和FF通用 
 * （3）MM-dd-yyyy：仅IE 
 * （4）yyyy-MM-dd：非IE，且时钟被解析在8点整 
 */ 
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; 
} 

/** 
 * 计算两个日期的天数差： 
 * dateOne：必选，必须是Data类型的实例 
 * dateTwo：必选，必须是Data类型的实例 
 */ 
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)); 
  } 
} 

/** 
 * 日期计算：支持负数，即可加可减，返回计算后的日期 
 * num：必选，必须是数字，且正数是时期加，负数是日期减 
 * field：可选，标识是在哪个字段上进行相加或相减，字段见如下的约定。无此参数时，默认为d 
 * 约定如下格式： 
 * （1）Y/y 年 
 * （2）M 月 
 * （3）W/w 周 
 * （4）D/d 日 
 * （5）H/h 时 
 * （6）m 分 
 * （7）S/s 秒 
 * （8）Q/q 季 
 */ 
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; 
} 

/** 
 * 比较日期差：比较两个时期相同的字段，返回相差值 
 * dtEnd：必选，必须是Data类型的实例 
 * field：可选，标识是在哪个字段上进行比较，字段见如下的约定。无此参数时，默认为d 
 * 约定如下格式： 
 * （1）Y/y 年 
 * （2）M 月 
 * （3）W/w 周 
 * （4）D/d 日 
 * （5）H/h 时 
 * （6）m 分 
 * （7）S/s 秒 
 */ 
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; 
  } 
} 

/** 
 * 把日期分割成数组：按数组序号分别为：年月日时分秒 
 */ 
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; 
} 

/** 
 * 取得日期数据信息： 
 * field：可选，标识是在哪个字段上进行比较，字段见如下的约定。无此参数时，默认为d 
 * （1）Y/y 年 
 * （2）M 月 
 * （3）W/w 周 
 * （4）D/d 日 
 * （5）H/h 时 
 * （6）m 分 
 * （7）S/s 秒 
 */ 
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(); 
}
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