JS method of calculating age by birthday
- 2020-06-03 05:55:05
- OfStack
This article illustrates JS's method of calculating age according to birthday. Share to everybody for everybody reference. Specific implementation methods are as follows:
function parseDate(str){
if(str.match(/^\d{4}[\-\/\s+]\d{1,2}[\-\/\s+]\d{1,2}$/)){
return new Date(str.replace(/[\-\/\s+]/i,'/'));
}
else if(str.match(/^\d{8}$/)){
return new Date(str.substring(0,4)+'/'+str.substring(4,6)+'/'+str.substring(6));
}
else{
return (' Time conversion error! ');
}
}
function GetAgeByBrithday(birthday){
var age=-1;
var today=new Date();
var todayYear=today.getFullYear();
var todayMonth=today.getMonth()+1;
var todayDay=today.getDate();
var birthday=parseDate(birthday);
if(parseDate(birthday)!=' Time conversion error! ')
{
birthdayYear=birthday.getFullYear();
birthdayMonth=birthday.getMonth();
birthdayDay=birthday.getDate();
if(todayYear-birthdayYear<0)
{
alert(" Wrong date of birth !");
}
else
{
if(todayMonth*1-birthdayMonth*1<0)
{
age = (todayYear*1-birthdayYear*1)-1;
}
else
{
if(todayDay-birthdayDay>=0)
{//alert(thisDay+'-'+brithd+"_ddd");
age = (todayYear*1-birthdayYear*1);
}
else
{
age = (todayYear*1-birthdayYear*1)-1;
}
}
}
return age*1;
}
else
{
return -1;
}
}
Hopefully, this article has been helpful in your javascript programming.