js字符串转日期，日期转字符串详解编程语言

字符串日期转为日期

//把字符串日期转为日期 
function ConvertStrToDate(datetimeStr) { 
    var mydateint = Date.parse(datetimeStr);//数值格式的时间 
    if (!isNaN(mydateint)) { 
        var mydate = new Date(mydateint); 
        return mydate; 
    } 
    var mydate = new Date(datetimeStr);//字符串格式时间 
    var monthstr = mydate.getMonth() + 1; 
    if (!isNaN(monthstr)) {//转化成功 
        return mydate; 
    }//字符串格式时间转化失败 
    var dateParts = datetimeStr.split(" "); 
    var dateToday = new Date(); 
    var year = dateToday.getFullYear(); 
    var month = dateToday.getMonth(); 
    var day = dateToday.getDate(); 
    if (dateParts.length >= 1) { 
        var dataPart = dateParts[0].split("-");//yyyy-mm-dd  格式时间              
        if (dataPart.length == 1) { 
            dataPart = dateParts[0].split("/");//yyyy/mm/dd格式时间 
        } 
        if (dataPart.length == 3) { 
            year = Math.floor(dataPart[0]); 
            month = Math.floor(dataPart[1]) - 1; 
            day = Math.floor(dataPart[2]); 
        } 
    } 
    if (dateParts.length == 2) {//hh:mm:ss格式时间 
        var timePart = dateParts[1].split(":");//hh:mm:ss格式时间 
        if (timePart.length == 3) { 
            var hour = Math.floor(timePart[0]); 
            var minute = Math.floor(timePart[1]); 
            var second = Math.floor(timePart[2]); 
            return new Date(year, month, day, hour, minute, second); 
        } 
    } 
    else { 
        return new Date(year, month, day); 
    } 
}

日期格式化为字符串

 //完整的格式化  var time2 = new Date().format("yyyy-MM-dd hh:mm:ss"); 
          Date.prototype.format = function (fmt) { 
              var o = { 
                  "M+": this.getMonth() + 1,                 //月份  
                  "d+": this.getDate(),                    //日  
                  "h+": this.getHours(),                   //小时  
                  "m+": this.getMinutes(),                 //分  
                  "s+": this.getSeconds(),                 //秒  
                  "q+": Math.floor((this.getMonth() + 3) / 3), //季度  
                  "S": this.getMilliseconds()             //毫秒  
              }; 
              //处理年份 
              var reYear = /(y+)/;  
              var resultYear = reYear.exec(fmt); 
              if (resultYear)  
              { 
                  var yearformatPart = resultYear[0];//匹配到的格式化字符 
                  var yearVal = (this.getFullYear() + "").substr(4 - yearformatPart.length); 
                  fmt = fmt.replace(yearformatPart, yearVal); 
              } 
              for (var k in o) { 
                  var re = new RegExp("(" + k + ")"); 
                  var re = re.exec(fmt); 
                  if (re) { 
                      var Val = "" + o[k];//本次需要替换的数据  
                      var formatPart = re[0];//匹配到的格式化字符 
                      var replaceVal = (formatPart.length == 1) ? (Val) : (("00" + Val).substr(Val.length)); 
                      fmt = fmt.replace(formatPart, replaceVal); 
                  } 
              } 
              return fmt; 
          }

JS日期格式化转换方法