Fix calendar form field Deprecated warning from Joomla 3 to Joomla 5

1. Joomla 3 site code

<field name="schedule_time"
 type="calendar"
 label="JSMS_SEND_SCHEULE_CHOOSE_TIME"
 description="JSMS_SEND_SCHEULE_CHOOSE_TIME_DESC"
 default="now"
 format="%Y-%m-%d %H:%M"
/>

Above code will work fine in Joomla 3 version. But will through warning error in Joomla 5
Deprecated: Function strftime() is deprecated in libraries/src/Form/Field/CalendarField.php on line 323

We need to remove 'now' from 'default' attribute to make it working in Joomla 5.
<field name="schedule_time"
 type="calendar"
 label="JSMS_SEND_SCHEULE_CHOOSE_TIME"
 description="JSMS_SEND_SCHEULE_CHOOSE_TIME_DESC"
 default=""
 format="%Y-%m-%d %H:%M"
/>

 You can also enhance calendar form field by adding more attributes, check following code, in which attributes speak all about them:

<field name="schedule_time"
	type="calendar"
	label="JSMS_SEND_SCHEULE_CHOOSE_TIME"
	description="JSMS_SEND_SCHEULE_CHOOSE_TIME_DESC"
	default="" 
	format="%Y-%m-%d %H:%M"
	class="input-small" filter="user_utc"
	showtime="false" todaybutton="false" filltable="false" translateformat="true" />

Hope this helped.

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