检查输入日期是否在给定范围内

Question

I have a form with a simple input type. I'm trying to define a function to check if the date is no more than 6 months older compared to date provided by the input type. I know i have to convert the String provided by the input in a Date object to make this comparison and then work on get methods of Date object, but i can't figure out how to do this.

Current code:

$scope.compareDates = function(d1) {
        d1 = new Date(d1); //convert String into date Object                
        var d = new Date(); // today date           
        d.setYear(d.getFullYear());
        d.setMonth(d.getMonth() - 6);           

        if(d1 > d ) {
            console.log("ok");
        } else {
            console.log("error");               
        }
    }   

EDIT:

I'm sorry, i forgot to add my input. Here it is:

<input class="form-control" type="text" placeholder="gg/mm/aaaa" ng-model="sStartDate" ng-change="change()">

Angular Controller:

$scope.sStartDate = '';

$scope.change = function(){

    var startDt = $scope.sStartDate;
    $scope.compareDates(startDt);

}

Answer 1

If I am reading your code correctly, your date format is days/month/year which is not valid format. You need to swap the month and days.

var parts = d1.split(),
    dateStr = parts[1] + "/" + parts[0] + "/" parts[2],
    d1 = new Date(d1),
    d = new Date();
d.setMonth(d.getMonth() - 6);
if(d1 > d ) {
    console.log("ok");
} else {
    console.log("error");               
}

Answer 2

What's about using d.getTime() ?

$scope.compareDates = function(d1){
        d1 = new Date(d1); //convert String into date Object                
        var d = new Date(); // today date           
        d.setMonth(d.getMonth() - 6);           

        if(d1.getTime() > d.getTime() ) {
            console.log("ok");
        } else {
            console.log("error");                
        }
    }   

Regards.

Answer 3

I used momentjs for this in our app. It makes this process very easy and smooth.

// is6MonthsOld will be a boolean value
var is6MonthsOld = moment(d1).isBefore(moment().subtract(6, 'months'));

Answer 4

If you are comparing dates and not time , make sure to reset time in your date object using d1.setHours(0,0,0,0) .

When you do new Date() , output is a datetime object, but when you do new Date(2015,6,19) , only date is assigned and time is set to 00:00:00 .

Following code depicts the same:

 function compareDates(d1,d2){ return +d2 > +d1; } function compareDatesWithHoursReset(d1,d2){ d1.setHours(0,0,0,0); d2.setHours(0,0,0,0); return +d2 > +d1; } function main(){ var d1 = new Date(); var d2 = new Date(2015, 6, 19); d1.setMonth(d1.getMonth() - 6) console.log(d1); console.log(d2); console.log(compareDates(d2,d1)) console.log(compareDatesWithHoursReset(d2,d1)) } main();