javascript之日期

Myth丶恋晨 2022-07-17 04:13 130阅读 0赞

1.日期格式化代码：

Date.prototype.Format = function (fmt) { //author: meizz 
    		    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 
    		    };
    		    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    		    for (var k in o)
    		    if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    		    return fmt;
    		}

2.使用方法：

var date=new Date(毫秒);
    	   var datefor = date.Format("yyyy-MM-dd");

3.获取当天的开始与结束时间

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    			  Calendar todayStart = Calendar.getInstance();  
    		        todayStart.set(Calendar.HOUR_OF_DAY, 0);  
    		        todayStart.set(Calendar.MINUTE, 0);  
    		        todayStart.set(Calendar.SECOND, 0);  
    		        todayStart.set(Calendar.MILLISECOND, 0);  
    		        Date ds = new Date(todayStart.getTime().getTime());
    		        Date date1=sdf.parse(sdf.format(ds));
    			
    			   Calendar todayEnd = Calendar.getInstance();  
    		        todayEnd.set(Calendar.HOUR_OF_DAY, 23);  
    		        todayEnd.set(Calendar.MINUTE, 59);  
    		        todayEnd.set(Calendar.SECOND, 59);  
    		        todayEnd.set(Calendar.MILLISECOND, 999);  
    		        Date d = new Date(todayEnd.getTime().getTime());
    		        Date date2=sdf.parse(sdf.format(d));

4.获取当前周的周一与周日

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
    			  Calendar monday = Calendar.getInstance();
    			  int mondayofweek = monday.get(Calendar.DAY_OF_WEEK) - 1;
    			  if (mondayofweek == 0)
    			   mondayofweek = 7;
    			  monday.add(Calendar.DATE, -mondayofweek + 1);
    			  Calendar funday = Calendar.getInstance();
    			  int fundayofweek = funday.get(Calendar.DAY_OF_WEEK) - 1;
    			  if (fundayofweek == 0)
    			   fundayofweek = 7;
    			  funday.add(Calendar.DATE, -fundayofweek + 8);
    			String f1=sdf.format(monday.getTime());
    			Date date1 = sdf.parse(f1);
    			String f2=sdf.format(funday.getTime());
    			Date date2 = sdf.parse(f2);