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Strict Mode

The strictMode is an act, that allows the user to enter only the valid date and time within the specified min/max range in textbox. If the input entered is invalid, then the component will stay with the previous value. Else, if the date and time is out of range, then the component will set the date to the min/max value.

The following example demonstrates the DateTimePicker in strictMode with min/max range of 5/5/2019 2:00 AM to 5/25/2019 2:00 AM. Here, it allows to enter only the valid date and time within the specified range. If you are trying to enter the out-of-range value as like 5/28/2019, then the value will set to the max value as 5/25/2019 2:00 AM. Since the value 28 is greater than to max value of 25. Or else if you are trying to enter the invalid date, then the value will stay with the previous value.

Source
Preview
index.tsx
index.html
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { DateTimePickerComponent } from '@syncfusion/ej2-react-calendars';

class App extends React.Component<{}, {}> {

    private minDate: Date =new Date('5/5/2019 2:00 AM');
    private  maxDate: Date =new Date('5/25/2019 2:00 AM');
    private  dateValue: Date = new Date('5/28/2019 2:00 AM');
    private  enable: boolean = true;

    render() {
        return <DateTimePickerComponent id="datetimepicker" value={this.dateValue} min={this.minDate} strictMode={this.enable} max={this.maxDate} />;
    }
}
ReactDOM.render(<App />, document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React DatePicker</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-calendars/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='element'>
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>

By default, the DateTimePicker act in strictMode false state, that allows to enter the invalid or out-of-range datetime in textbox.

If the datetime is out-of-range or invalid, then the model value will be set to out of range datetime value or null respectively with highlighted error class to indicates the datetime is out of range or invalid.

The following example demonstrates the strictMode as false. Here, it allows to enter the valid or invalid value in textbox. If you are entering the out-of-range or invalid datetime value, then the model value will be set to out of range datetime value or null respectively with highlighted error class to indicates the datetime is out of range or invalid.

Source
Preview
index.tsx
index.html
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { DateTimePickerComponent } from '@syncfusion/ej2-react-calendars';

class App extends React.Component<{}, {}> {

    private minDate: Date =new Date('5/5/2019 2:00 AM');
    private  maxDate: Date =new Date('5/25/2019 2:00 AM');
    private  dateValue: Date = new Date('5/28/2019 2:00 AM');
    private  enable: boolean = false;

    render() {
        return <DateTimePickerComponent id="datetimepicker" value={this.dateValue} min={this.minDate} strictMode={this.enable} max={this.maxDate} placeholder='Select a date and time' />;
    }
}
ReactDOM.render(<App />, document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React DatePicker</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-calendars/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='element'>
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>

 If the value of min or max properties changed through code behind, then you have to update the value property to set within the range.