Q - How to change date and time format in datetime-local input field ?

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Raja Pdl
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Q - How to change date and time format in datetime-local input field ?

โพสต์ที่ยังไม่ได้อ่าน โดย Raja Pdl »

I want to display date and time format as
"d-M-Y h:i A" format
for example "08-Nov-2024 12:00 AM"
in datetime-local input field.

โค้ด: เลือกทั้งหมด

<input type="datetime-local" >
But it displays in the format of "11/8/2024 12:00AM"

How to change date time format to display as "d-M-Y h:i A" ?
MindPHP Assistant

Re: Q - How to change date and time format in datetime-local input field ?

โพสต์ที่ยังไม่ได้อ่าน โดย MindPHP Assistant »

The `datetime-local` input field in HTML is designed to handle date and time in a specific format: `YYYY-MM-DDTHH:MM`. This format is standardized for web forms to ensure consistent data submission, and it doesn't allow for custom display formatting directly through HTML attributes.

However, you can achieve the desired display format using JavaScript. Here’s a general approach:

1. Use JavaScript to listen for changes to the `datetime-local` input.
2. Format the date and time when displaying it elsewhere on the page.

Here is how you can do it:

โค้ด: เลือกทั้งหมด

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DateTime Format Example</title>
</head>
<body>

<label for="datetime">Select Date and Time:</label>
<input type="datetime-local" id="datetime" name="datetime">
<p id="formattedDateTime"></p>

<script>
    document.getElementById('datetime').addEventListener('change', function() {
        var input = this.value;
        var date = new Date(input);

        // Format as "d-M-Y h:i A"
        var options = { year: 'numeric', month: 'short', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: true };
        var formattedDate = new Intl.DateTimeFormat('en-US', options).format(date).replace(',', '');

        // Manually change the format to include the month in 3-letter format
        var day = date.getDate().toString().padStart(2, '0');
        var month = date.toLocaleString('en', { month: 'short' });
        var year = date.getFullYear();
        var hours = date.getHours() % 12 || 12;
        var minutes = date.getMinutes().toString().padStart(2, '0');
        var ampm = date.getHours() >= 12 ? 'PM' : 'AM';

        var customFormattedDate = `${day}-${month}-${year} ${hours}:${minutes} ${ampm}`;

        document.getElementById('formattedDateTime').innerText = customFormattedDate;
    });
</script>

</body>
</html>
### Explanation:

1. **HTML Structure**: We have an input of type `datetime-local` and a `<p>` tag to display the formatted date.

2. **JavaScript**:
- An event listener is attached to the input field to detect changes (`change` event).
- When a user selects a date and time, the value from the input (`this.value`) is used to create a JavaScript `Date` object.
- The date is then manually formatted into the desired format: `d-M-Y h:i A`.
- The formatted date is displayed in the `<p>` tag.

### Limitations:
- The format of the native input cannot be changed directly; you can only alter how the data is displayed after selection.
- This example only formats the output display. It doesn't change the appearance of the input field itself during input.
Raja Pdl
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โพสต์: 2241
ลงทะเบียนเมื่อ: 27/05/2024 9:50 am

Re: Q - How to change date and time format in datetime-local input field ?

โพสต์ที่ยังไม่ได้อ่าน โดย Raja Pdl »

MindPHP Assistant เขียน: 08/11/2024 4:35 pm The `datetime-local` input field in HTML is designed to handle date and time in a specific format: `YYYY-MM-DDTHH:MM`. This format is standardized for web forms to ensure consistent data submission, and it doesn't allow for custom display formatting directly through HTML attributes.

However, you can achieve the desired display format using JavaScript. Here’s a general approach:

1. Use JavaScript to listen for changes to the `datetime-local` input.
2. Format the date and time when displaying it elsewhere on the page.

Here is how you can do it:

โค้ด: เลือกทั้งหมด

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DateTime Format Example</title>
</head>
<body>

<label for="datetime">Select Date and Time:</label>
<input type="datetime-local" id="datetime" name="datetime">
<p id="formattedDateTime"></p>

<script>
    document.getElementById('datetime').addEventListener('change', function() {
        var input = this.value;
        var date = new Date(input);

        // Format as "d-M-Y h:i A"
        var options = { year: 'numeric', month: 'short', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: true };
        var formattedDate = new Intl.DateTimeFormat('en-US', options).format(date).replace(',', '');

        // Manually change the format to include the month in 3-letter format
        var day = date.getDate().toString().padStart(2, '0');
        var month = date.toLocaleString('en', { month: 'short' });
        var year = date.getFullYear();
        var hours = date.getHours() % 12 || 12;
        var minutes = date.getMinutes().toString().padStart(2, '0');
        var ampm = date.getHours() >= 12 ? 'PM' : 'AM';

        var customFormattedDate = `${day}-${month}-${year} ${hours}:${minutes} ${ampm}`;

        document.getElementById('formattedDateTime').innerText = customFormattedDate;
    });
</script>

</body>
</html>
### Explanation:

1. **HTML Structure**: We have an input of type `datetime-local` and a `<p>` tag to display the formatted date.

2. **JavaScript**:
- An event listener is attached to the input field to detect changes (`change` event).
- When a user selects a date and time, the value from the input (`this.value`) is used to create a JavaScript `Date` object.
- The date is then manually formatted into the desired format: `d-M-Y h:i A`.
- The formatted date is displayed in the `<p>` tag.

### Limitations:
- The format of the native input cannot be changed directly; you can only alter how the data is displayed after selection.
- This example only formats the output display. It doesn't change the appearance of the input field itself during input.
But it displays the desired format in <p id="formattedDateTime"></p>
I want to display "d-M-Y h:i A" format inside the input box.
How can I do ?
MindPHP Assistant

Re: Q - How to change date and time format in datetime-local input field ?

โพสต์ที่ยังไม่ได้อ่าน โดย MindPHP Assistant »

Unfortunately, HTML's native `datetime-local` input field strictly adheres to the `YYYY-MM-DDTHH:MM` format and does not allow for customization of its display format. This limitation is due to the fact that the browser controls the appearance and behavior of the input field for consistency and user experience reasons.

However, you can achieve the desired display format within the input field by using a combination of a regular text input and JavaScript or a third-party date-time picker library that supports custom date-time formats. Here’s how you can do it using a regular text input with JavaScript:

### Using a Regular Text Input with JavaScript
You can manually handle date and time input by using a simple text field, and format the input and output using JavaScript:

โค้ด: เลือกทั้งหมด

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Custom DateTime Format Example</title>
</head>
<body>

<label for="datetime">Enter Date and Time:</label>
<input type="text" id="datetime" name="datetime" placeholder="DD-MMM-YYYY HH:MM AM/PM">
<p id="formattedDateTime"></p>

<script>
    document.getElementById('datetime').addEventListener('blur', function() {
        var input = this.value;
        var parsedDate = parseDate(input);

        if (parsedDate) {
            // Display formatted date
            document.getElementById('formattedDateTime').innerText = parsedDate.toLocaleString();
        } else {
            alert('Invalid date format. Please use "DD-MMM-YYYY HH:MM AM/PM".');
        }
    });

    function parseDate(input) {
        var datePattern = /(\d{2})-(\w{3})-(\d{4}) (\d{2}):(\d{2}) (AM|PM)/;
        var match = input.match(datePattern);

        if (match) {
            var day = parseInt(match[1], 10);
            var month = new Date(Date.parse(match[2] + " 1, 2020")).getMonth();
            var year = parseInt(match[3], 10);
            var hours = parseInt(match[4], 10);
            var minutes = parseInt(match[5], 10);
            var ampm = match[6];

            if (ampm === 'PM' && hours < 12) {
                hours += 12;
            }
            if (ampm === 'AM' && hours === 12) {
                hours = 0;
            }

            return new Date(year, month, day, hours, minutes);
        }
        return null;
    }
</script>

</body>
</html>
### Explanation:
- **Text Input**: We use a regular text input field instead of `datetime-local`.
- **Event Listener**: We attach an event listener for the `blur` event to validate and parse the input when the user moves away from the input field.
- **Custom Parsing**: The `parseDate` function uses a regular expression to extract components of the date and time from the input string, converts them into a `Date` object, and handles AM/PM conversion.
- **Validation and Feedback**: If the input doesn't match the required format, an alert informs the user of the expected format.

### Alternative: Use a Date-Time Picker Library
For a more robust solution, consider using a date-time picker library such as [Flatpickr](https://flatpickr.js.org/), [Pikaday](https://pikaday.com/), or [jQuery Datepicker](https://jqueryui.com/datepicker/), which often support custom formats and are highly customizable.

These libraries provide enhanced date-time picking functionality and allow you to specify the format both for display and submission, making them versatile for various use cases.
Raja Pdl
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โพสต์: 2241
ลงทะเบียนเมื่อ: 27/05/2024 9:50 am

Re: Q - How to change date and time format in datetime-local input field ?

โพสต์ที่ยังไม่ได้อ่าน โดย Raja Pdl »

input type datetime-local use the format of PC time format.

When I changed date and time settings in my PC, it change the format in the date-time local input field also

To get the format "d-M-Y h:i A"

I changed Settings > Date and Time Settings > Date, time and regional formatting > Additional date, time and regional settings > Region (change date,time or number formats) > Under the formats tab > In the field of "Short date" , change to dd-MMM-yyyy > Click on Apply > Ok
(if format not found in "Short date", Click on "additional settings" > Under the "Date" tab > In the Date Format Field > in Short Date > Convert from dd-MMM-yy to dd-MMM-yyyy (add "yy") in that Short Date Field

And refresh your web page that includes input type datetimep-local
If it doesn't change, sometimes we have to restart the PC
After you have restarted , input box will display in the format of dd-MMM-yyyy or d-M-Y h:i A
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