angular - Ionic 2 calendar does not pick ion-datetime from html -


i trying creat event in native/device calendar. have created html form allows enter start , end date. now, ionic create event understands start , end date date type. do? how convert string datetime ot so?

see code below: 

<ion-content>    <ion-item>      <ion-label>title</ion-label>      <ion-input type="text" name="title" [value]="" (input)="title= $event.target.value"></ion-input>    </ion-item>    <ion-item>      <ion-label>details</ion-label>      <ion-input type="text" name="details" [value]="" (input)="details= $event.target.value"></ion-input>    </ion-item>        <ion-item>      <ion-label>start date</ion-label>      <ion-datetime displayformat="mmm dd, yyyy hh:mm" pickerformat="mmm dd, yyyy hh:mm" name="startdate" (input)="startdate = $event.target.value"></ion-datetime>    </ion-item>      <ion-item>      <ion-label>end date</ion-label>      <ion-datetime displayformat="mmm dd, yyyy hh:mm" pickerformat="mmm dd, yyyy hh:mm" name="enddate" (input)="enddate = $event.target.value"></ion-datetime>    </ion-item>    </ion-content>

title: string = '';  details: string = '';  startdate: = '';  enddate: = '';    constructor(public calendar: calendar) {    }    createevent() {      this.calendar.createeventwithoptions(this.title, null, this.details, this.startdate, this.enddate).then(() => {      alert("success");    }, () => {      alert("fail");    });  }

set variable in want save input values ngmodel attribute.

<ion-content>    <ion-item>     <ion-label>title</ion-label>     <ion-input type="text" name="title" [value]="" [(ngmodel)]="title"></ion-input>   </ion-item>   <ion-item>     <ion-label>details</ion-label>     <ion-input type="text" name="details" [value]="" [(ngmodel)]="details"></ion-input>   </ion-item>    <ion-item>     <ion-label>start date</ion-label>     <ion-datetime displayformat="mmm dd, yyyy hh:mm" pickerformat="mmm dd, yyyy hh:mm" name="startdate" [(ngmodel)]="startdatestring"></ion-datetime>   </ion-item>    <ion-item>     <ion-label>end date</ion-label>     <ion-datetime displayformat="mmm dd, yyyy hh:mm" pickerformat="mmm dd, yyyy hh:mm" name="enddate" [(ngmodel)]="enddatestring"></ion-datetime>   </ion-item>  </ion-content>

in createevent function have convert date string date:

  title: string = '';   details: string = '';   startdatestring: string = '';   enddatestring: string = '';    constructor(public navctrl: navcontroller, public calendar:calendar) {    }    createevent() {     // check if dates have been selected     if(this.startdatestring.length>0 && this.enddatestring.length>0){       let startdate:date = new date(this.startdatestring);       let enddate:date = new date(this.enddatestring);       this.calendar.createeventwithoptions(this.title, null, this.details, startdate, enddate).then(() => {         alert("success");       }, () => {         alert("fail");       });     }   }

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