1.字符串转时间
function stringToDate(DateStr){ var starttime= DateStr.substring(0,10); var day= DateStr.substring(11,19); var d= starttime.split('-'); if(day != null){ var t= day.split(':'); d[1]=d[1]-1; //月份减一 var d= new Date(d[0],d[1],d[2],t[0],t[1],t[2]); }else{ d[1]=d[1]-1; //月份减一 var d= new Date(d[0],d[1],d[2]); } d.setDate(d.getDate()); return d; }
2.计算结束时间
function StringToDateArray(DateStr,PERIOD){ //天数 var num=''; var starttime= DateStr.substring(0,10); var day= DateStr.substring(11,19); var d= starttime.split('-'); if(day != null){ var t= day.split(':'); d[1]=d[1]-1; //月份减一 var d= new Date(d[0],d[1],d[2],t[0],t[1],t[2]); }else{ d[1]=d[1]-1; //月份减一 var d= new Date(d[0],d[1],d[2]); } d.setDate(d.getDate()+num); return d; }
3.倒计时
function dateFormat(endtime) { var str = ""; var leftTime =time1.getTime() -new Date().getTime(); //alert(leftTime) if (leftTime>=0) { str+=Math.floor(leftTime/1000/60/60/24)+"天"; str+=Math.floor(leftTime/1000/60/60%24)+"时"; str+=Math.floor(leftTime/1000/60%60)+"分"; str+=Math.floor(leftTime/1000%60)+"秒"; } else{ _str="" } return str }
4.加定时器
setInterval( function(){ var time=dateFormat(time); //设置到元素上面 $(#id).val(time); }, 1000);
5.案例
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <style> 7 table td { 8 font-size: 12px; 9 200px; 10 height: 30px; 11 text-align: center; 12 background-color: #4f891e; 13 color: #ffffff; 14 } 15 </style> 16 </head> 17 <body> 18 19 <script> 20 window.onload = function () { 21 var mm =strToDate('2020-08-12'); 22 var nn =strToDate('2020-09-13'); 23 var dd=nn-mm; 24 var cc=Math.floor(dd/1000/60/60/24) 25 alert(cc); 26 }; 27 28 function strToDate(strDate){ 29 var date = eval('new Date(' + strDate.replace(/d+(?=-[^-]+$)/, 30 function (a) { return parseInt(a, 10) - 1; }).match(/d+/g) + ')'); 31 return date; 32 } 33 </script> 34 </body> 35 </html>