How to print a date field value on a page? In Drupal 7, I have created a node type x,  with a date field D:M:Y. Here is an edited Devel tree array structure message for easy reading:

content >> system_main >> nodes >> 31 >> field_Mydate >> #items >> 0 >> value

Main question: How to print the particular node date field value from above extract? (page.tpl)
You should use Drupal's 'format_date' function.

Example:
format_date(strtotime($entity->field_mydate['und'][0]['value2']) ,'custom','F j, Y');