input type='datetime-local' managing output and setting default value with max and min data in PHP

datetime-local input uses RFC 3339 format for input and output.
User input of date and time can be collected by using this input type.
We will develop sample codes to collect the data and how to set the default values along with data for max , min attributes.

Source code is here .

<input type='datetime-local' id='input_time' name='input_time' 
value='2018-06-12T19:30' min='2018-06-07T00:00' max='2018-06-14T00:00'>

Adding Seconds

By adding step=1 we can include seconds selection in our input.

<input type='datetime-local' id='input_time' name='input_time' 
value='2018-06-12T19:30:46' 
min='2018-06-07T00:00:56' max='2018-06-14T00:00:34' step=1>

Creating the date and time object using datetime-local as input

As we receive the input as POST ( or GET ) method, the PHP code part is here to create the date and time object.

//$dt=$_POST['dt']; // Getting data from POST method of form
$dt="2019-02-16T16:56:49";
$date = DateTime::createFromFormat('Y-m-d\TH:i:s', $dt);
if($date){$msg=' Date object is created using the input ';}
else{$msg=' Unable to create date object ';}
echo $msg;

createFromFormat() to create date and time object

Setting present date and time as default value for datetime-local input

$date = new DateTime(); // Date object using current date and time
$dt= $date->format('Y-m-d\TH:i:s'); 
echo "<input type='datetime-local' id='input_time' name='input_time' value='$dt'>";

Output is here :

datetime-local with Maximum Minimum and default value setting

$dt_min = date_create('2018-12-31 23:15:40');  // Minimum limit
$dt_min= $dt_min->format('Y-m-d\TH:i:s'); 

$dt_max = date_create('2015-05-31 20:14:45');  // Maximum limit
$dt_max= $dt_max->format('Y-m-d\TH:i:s'); 

$dt = new DateTime(); // Date object using current date and time
$dt= $dt->format('Y-m-d\TH:i:s'); 

echo "<input type='datetime-local' id='input_time' name='input_time' value='$dt' min='$dt_min' max='$dt_max'>";

Output is here

With Maximum and minimum period from current date and time

Minimum allowed date is previous one month 10 days and Maximum allowed date is one month and 10 days from todays

$dt_min = new DateTime('-1 month -10 days');
$dt_min= $dt_min->format('Y-m-d\TH:i:s'); 

$dt_max = new  DateTime('+1 month 10 days');  // Maximum limit
$dt_max= $dt_max->format('Y-m-d\TH:i:s'); 

$dt = new DateTime(); // Date object using current date and time
$dt= $dt->format('Y-m-d\TH:i:s'); 

echo "<input type='datetime-local' id='input_time' name='input_time' value='$dt' min='$dt_min' max='$dt_max'>";

Output is here :

Questions

How can I retrieve the selected date and time from an `<input type="datetime-local">` field in PHP?
How do I set a default value for an `<input type="datetime-local">` field using PHP?
How can I validate the input from an `<input type="datetime-local">` field in PHP to ensure it is in a specific format or range?
How do I convert the selected date and time from an `<input type="datetime-local">` field to a different time zone using PHP?
How can I add or subtract a specific number of days, hours, or minutes from the selected date and time in an `<input type="datetime-local">` field using PHP?
How do I compare two `<input type="datetime-local">` fields in PHP to check if one is earlier or later than the other?
How can I format the selected date and time from an `<input type="datetime-local">` field into a custom format using PHP?
How do I calculate the difference in days, hours, minutes, or seconds between two selected dates and times from `<input type="datetime-local">` fields using PHP?
How can I dynamically update the selectable range of dates and times in an `<input type="datetime-local">` field based on specific conditions using PHP?
How do I handle and process the selected date and time from an `<input type="datetime-local">` field submitted via a PHP form?

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Managing <DateTime-local> input type with max min and default value