# Js calculates the instance code for the days difference between two times

• 2020-03-29 23:50:35
• OfStack

``````
//Determine if it is a leap year
function isLeapYear(year){
if(year % 4 == 0 && ((year % 100 != 0) || (year % 400 == 0)))
{
return true;
}
return false;
}
//Determine the before and after dates
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;
}
}
//Calculate the difference between the two dates
function dateDiff(d1,d2){
var disNum=compareDate(d1,d2);
return 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{
alert(' Sorry, the first time must be less than the second time, thank you! ');
exit;
}
}
``````

Calling this function passes two values of time: 2013-01-19& PI;   2013-12-19

Days = dateDiff (d1, d2);

Related articles: