javascript一些有关date操作的方法

我会带着你远行 2022-07-24 05:00 226阅读 0赞

<span style="font-size:12px;">    // 判断日期是不是周末
        function checkWeekend() {
            var startDate = $("input[name=begin_time]").val();
            var endDate = $("input[name=end_time]").val();
            var weekDays = 0;// 开始日期和结束日期之间相隔的周末天数
            var count = 0;// 循环次数
            if(startDate <= endDate) {// 开始日期必须小于结束日期，防止死循环
                var nextDate = startDate;
                while(nextDate != endDate) {
                    nextDate = getNextDate(nextDate,1);
                    
                    // 判断nextDate是否是周末，如果是周末则减去
                    var day = new Date(nextDate).getDay();//0-周日，6-周六
                    if(day==0 || day==6) {
                        weekDays ++;
                    }
                    
                    count ++;
                    if(count>=180) {// 防止死循环
                        break;
                    }
                }
            }
            
            var day = $("input[name=day]").val();
            $("input[name=day]").val(day-weekDays);// 减去周末时间
        }</span>

<span style="font-size:12px;">        // 字符转日期
            getDate : function(strDate) {    
                var date = eval('new Date(' + strDate.replace(/\d+(?=-[^-]+$)/,    
                 function (a) { return parseInt(a, 10) - 1; }).match(/\d+/g) + ')');    
                return date;    
            },
            // 取得下一个工作日
            getNextWorkDay: function(dateStr){
            	var _this = this;
            	function getNextDay(d){
                    d = new Date(d);
                    d = +d + 1000*60*60*24;
                    d = new Date(d);
                    //return d;
                    //格式化
                    var year = d.getFullYear();
                    var month = d.getMonth()+1;
                    month = month < 10?'0'+month:month;
                    var date = d.getDate() < 10?'0'+d.getDate():d.getDate();
                    return year+"-"+month+"-"+date;
                }
            	var nextDay = getNextDay(dateStr);
            	if(!_this.checkWeekDay(nextDay)){
            		nextDay = _this.getNextWorkDay(nextDay);
            	}
            	return nextDay;
            },
            // 判断是否周末
            checkWeekDay: function(dateStr){
            	var d = this.getDate(dateStr);
            	if(d.getDay() == 6 || d.getDay() == 0){
            		return false;
            	}else{
            		return true;
            	}
            },
            // 取得两天之间的工作日（除周末）
            getWorkDay: function(mode, beginDay, endDay) {
            	
            	var d1 = this.getDate(beginDay);
                var d2 = this.getDate(endDay);
                
                var dateS = this.getDate(beginDay)
                var dateE = this.getDate(endDay);
                
                var day = (dateE.getTime() - dateS.getTime()) / (1000 * 60 * 60 * 24);
                
                var w1 = dateS.getDay();
                var w2 = dateE.getDay();
                
                var w = parseInt(day / 7) * 2;
                w += w1 > w2 ? 2 : w1 == 0 ? 1 : 0;
                
               	return day - w + 1;
    //            //计算工作日
    //            var Holiday = ["2015-07-13", "2015-07-14", "2015-07-15", "2012-01-22", "2012-01-23", "2012-01-24", "2012-01-25", "2012-01-26", "2012-01-27", "2012-01-28", "2012-04-02", "2012-04-03", "2012-04-04", "2012-04-29", "2012-04-30", "2012-05-01", "2012-06-22", "2012-06-23", "2012-06-24", "2012-09-30", "2012-10-01", "2012-10-02", "2012-10-03", "2012-10-04", "2012-10-05", "2012-10-06", "2012-10-07"];
    //            var WeekendsOff = ["2015-07-11", "2012-01-21", "2012-01-29", "2012-03-31", "2012-04-01", "2012-04-28", "2012-09-29"];
    //
    //            function nearlyWeeks(mode, weekcount, end) {
    //                if (mode == undefined) {
    //                    mode = "cn"
    //                }
    //                if (weekcount == undefined) {
    //                    weekcount = 0
    //                }
    //                if (end != undefined) {
    //                    end = new Date(new Date(end).toDateString())
    //                } else {
    //                    end = new Date(new Date().toDateString())
    //                }
    //                var days = 0;
    //                if (mode == "cn") {
    //                    days = (end.getDay() == 0 ? 7 : end.getDay()) - 1
    //                } else {
    //                    days = end.getDay()
    //                }
    //                return new Date(end.getTime() - (days + weekcount * 7) * 24 * 60 * 60 * 1000)
    //            }
    //
    //            function getWorkDayCount(mode, beginDay, endDay) {
    //                var begin = new Date(beginDay.toDateString());
    //                var end = new Date(endDay.toDateString());
    //                var daytime = 24 * 60 * 60 * 1000;
    //                var days = (end - begin) / daytime + 1;
    //                var beginWeekFirstDay = nearlyWeeks(mode, 0, beginDay.getTime()).getTime();
    //                var endWeekOverDay = nearlyWeeks(mode, 0, endDay.getTime()).getTime() + 6 * daytime;
    //                var weekEndCount = ((endWeekOverDay - beginWeekFirstDay) / daytime + 1) / 7 * 2;
    //                if (mode == "cn") {
    //                    if (endDay.getDay() > 0 && endDay.getDay() < 6) {
    //                        weekEndCount -= 2
    //                    } else {
    //                        if (endDay.getDay() == 6) {
    //                            weekEndCount -= 1
    //                        }
    //                    }
    //                    if (beginDay.getDay() == 0) {
    //                        weekEndCount -= 1
    //                    }
    //                } else {
    //                    if (endDay.getDay() < 6) {
    //                        weekEndCount -= 1
    //                    }
    //                    if (beginDay.getDay() > 0) {
    //                        weekEndCount -= 1
    //                    }
    //                }
    //                $.each(WeekendsOff, function(i, offitem) {
    //                    var itemDay = new Date(offitem.split("-")[0] + "/" + offitem.split("-")[1] + "/" + offitem.split("-")[2]);
    //                    if (itemDay.getTime() >= begin.getTime() && itemDay.getTime() <= end.getTime() && (itemDay.getDay() == 0 || itemDay.getDay() == 6)) {
    //                        weekEndCount -= 1
    //                    }
    //                });
    //                $.each(Holiday, function(i, itemHoliday) {
    //                    var itemDay = new Date(itemHoliday.split("-")[0] + "/" + itemHoliday.split("-")[1] + "/" + itemHoliday.split("-")[2]);
    //                    if (itemDay.getTime() >= begin.getTime() && itemDay.getTime() <= end.getTime() && itemDay.getDay() > 0 && itemDay.getDay() < 6) {
    //                        weekEndCount += 1
    //                    }
    //                });
    //                return days - weekEndCount
    //            }
    //
    //            function getDate(strDate) {
    //                var date = eval("new Date(" + strDate.replace(/\d+(?=-[^-]+$)/, function(a) {
    //                    return parseInt(a, 10) - 1
    //                }).match(/\d+/g) + ")");
    //                return date
    //            }
    //            var r = getWorkDayCount("cn", getDate(beginDay), getDate(endDay));
    //            return r == undefined ? 0 : r;
            }</span>

// 获取日期：昨天今天和明天、后天

<span style="font-size:12px;"><body> 
    <script language="JavaScript" type="text/javascript"> 
    function GetDateStr(AddDayCount) { 
        var dd = new Date(); 
        dd.setDate(dd.getDate()+AddDayCount);//获取AddDayCount天后的日期 
        var y = dd.getFullYear(); 
        var m = dd.getMonth()+1;//获取当前月份的日期 
        var d = dd.getDate(); 
        return y+"-"+m+"-"+d; 
    } 
    document.write("前天："+GetDateStr(-2)); 
    document.write("<br />昨天："+GetDateStr(-1)); 
    document.write("<br />今天："+GetDateStr(0)); 
    document.write("<br />明天："+GetDateStr(1)); 
    document.write("<br />后天："+GetDateStr(2)); 
    document.write("<br />大后天："+GetDateStr(3)); 
    </script> 
    
    </body> </span>

其中有一种方法是：Date.parse(dateVal)，此函数功能强大，但是有个致命的缺点，那就是不支持我们常用的“年-月-日”格式，短日期可以使用“/”或“-”作为日期分隔符，但是必须用月/日/年的格式来表示，例如"7/20/96"。

另一种方法是使用 split，比如：

var dtStr = "2006-11-25"; 
    var dtArr = dtStr.split("-"); 
    var dt = new Date(dtArr[0], dtArr[1], dtArr[2]);

但这种方法较为死板，要求固定的日期格式，只有在没有办法的情况下才用。   
  
如果我们可以将年月日拆分开，就尽量将其拆开，比如 ASP 分别输出年月日。然后用 new Date 来处理，返回的便是日期类型。   
  
日期格式化

<span style="font-size:12px;">// js获取当前日期、前一天、后一天的日期的例子
    </span>

<span style="font-size:12px;">< script >
    function addByTransDate(dateParameter, num) {
    	var translateDate = "",
    		dateString = "",
    		monthString = "",
    		dayString = "";
    	translateDate = dateParameter.replace("-", "/").replace("-", "/");
    	var newDate = new Date(translateDate);
    	newDate = newDate.valueOf();
    	newDate = newDate + num * 24 * 60 * 60 * 1000;
    	newDate = new Date(newDate);
    	//如果月份长度少于2，则前加 0 补位
    	if ((newDate.getMonth() + 1).toString().length == 1) {
    		monthString = 0 + "" + (newDate.getMonth() + 1).toString();
    	} else {
    		monthString = (newDate.getMonth() + 1).toString();
    	}
    	//如果天数长度少于2，则前加 0 补位
    	if (newDate.getDate().toString().length == 1) {
    		dayString = 0 + "" + newDate.getDate().toString();
    	} else {
    		dayString = newDate.getDate().toString();
    	}
    	dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString;
    	return dateString;
    }
    
    function reduceByTransDate(dateParameter, num) {
    	var translateDate = "",
    		dateString = "",
    		monthString = "",
    		dayString = "";
    	translateDate = dateParameter.replace("-", "/").replace("-", "/");
    	var newDate = new Date(translateDate);
    	newDate = newDate.valueOf();
    	newDate = newDate - num * 24 * 60 * 60 * 1000;
    	newDate = new Date(newDate);
    	//如果月份长度少于2，则前加 0 补位
    	if ((newDate.getMonth() + 1).toString().length == 1) {
    		monthString = 0 + "" + (newDate.getMonth() + 1).toString();
    	} else {
    		monthString = (newDate.getMonth() + 1).toString();
    	}
    	//如果天数长度少于2，则前加 0 补位
    	if (newDate.getDate().toString().length == 1) {
    		dayString = 0 + "" + newDate.getDate().toString();
    	} else {
    		dayString = newDate.getDate().toString();
    	}
    	dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString;
    	return dateString;
    }
    //得到日期 主方法
    
    function showTime(pdVal) {
    	var trans_day = "";
    	var cur_date = new Date();
    	var cur_year = new Date().format("yyyy");
    	var cur_month = cur_date.getMonth() + 1;
    	var real_date = cur_date.getDate();
    	cur_month = cur_month > 9 ? cur_month : ("0" + cur_month);
    	real_date = real_date > 9 ? real_date : ("0" + real_date);
    	eT = cur_year + "-" + cur_month + "-" + real_date;
    	if (pdVal == 1) {
    		trans_day = addByTransDate(eT, 1);
    	} else if (pdVal == -1) {
    		trans_day = reduceByTransDate(eT, 1);
    	} else {
    		trans_day = eT;
    	}
    	//处理
    	return trans_day;
    }</span>