js 计算日期相隔天数
<!DOCTYPE HTML> <html> <head> <script language=javascript> //判断年份是否是闰年 function isLeapYear(year){ if(year % 4 == 0 && ((year % 100 != 0) || (year % 400 == 0))) { return true; } return false; } //判断前后两个日期 function validatePeriod(fyear,fmonth,fday,byear,bmonth,bday){ if(fyear < byear){ return true; }else if(fyear == byear){ if(fmonth < bmonth){ return true; } else if (fmonth == bmonth){ if(fday <= bday){ return true; }else { return false; } } else { return false; } }else { return false; } } //计算两个日期的差值 function get() { var d1 = document.getElementById("id1").value; var d2 = document.getElementById("id2").value; var disNum=compareDate(d1,d2); alert(disNum); } function compareDate(date1,date2) { var regexp=/^(/d{1,4})[-|/.]{1}(/d{1,2})[-|/.]{1}(/d{1,2})$/; var monthDays=[0,3,0,1,0,1,0,0,1,0,0,1]; regexp.test(date1); var date1Year=RegExp.$1; var date1Month=RegExp.$2; var date1Day=RegExp.$3; regexp.test(date2); var date2Year=RegExp.$1; var date2Month=RegExp.$2; var date2Day=RegExp.$3; if(validatePeriod(date1Year,date1Month,date1Day,date2Year,date2Month,date2Day)){ firstDate=new Date(date1Year,date1Month,date1Day); secondDate=new Date(date2Year,date2Month,date2Day); result=Math.floor((secondDate.getTime()-firstDate.getTime())/(1000*3600*24)); for(j=date1Year;j<=date2Year;j++){ if(isLeapYear(j)){ monthDays[1]=2; }else{ monthDays[1]=3; } for(i=date1Month-1;i<date2Month;i++){ result=result-monthDays[i]; } } return result; }else{ return 'the first field must before the second date.'; } } </script> </head> <body> <input type=text value="2008-02-04" id=id1> <input type=text value="2008-03-04" id = id2> <input type=button id=bt value="OK" onclick="get()"> </body> </html>