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PHP: Basic Date/Time Functions

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Dates and Time are always important to understand in any language. PHP has some rockin' functions but here are a few that I use the most.

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  1. function strip_zeros_from_date( $marked_string = "" ){
  2. 		//Remove any Zeros in the date
  3. 		$no_zeros = str_replace('*0', '', $marked_string );
  4. 		//Remove the Asterik regardless of no Zeros
  5. 		$cleaned_string = str_replace('*', '', $no_zeros );
  6.  
  7. 		return $cleaned_string;
  8. 	}
  9.  
  10. 	//Number of seconds since January 1, 1970
  11. 	echo $time = time();
  12. 	echo "<br /><br />";
  13.  
  14. 	//Make a timestamp using mktime( $hr, $min, $sec, $mo, $day, $yr )
  15. 	echo $mktime =  mktime( 2, 30, 45, 10, 1, 2009 );
  16. 	echo "<br /><br />";
  17.  
  18. 	//Convert this date to a string
  19. 	echo $date = strtotime("September 15, 2000");
  20. 	echo "<br /><br />";			
  21.  
  22. 	//Convert Last Monday to a String
  23. 	echo $last_monday = strtotime("last Monday");
  24. 	echo "<br /><br />";			
  25.  
  26. 	//Convert 1 day from today to a String
  27. 	echo $tomorrow = strtotime("+1 day");
  28. 	echo "<br /><br />";			
  29.  
  30. 	//Check if this date is valid (February 31st)
  31. 	echo $valid_date = checkdate( 2, 31, 2000 ) ? "true" : "false";
  32. 	echo "<br /><br />";			
  33.  
  34. 	//Format a Unix Timestamp into something human readable (http://php.net/manual/en/function.strftime.php)
  35. 	//The asterik is neat little hack that will help us build a helper function
  36. 	echo strip_zeros_from_date( strftime( "*%m/*%d/%y", $last_monday ) );
  37.  
  38. 	echo "<br /><br />";
  39.  
  40. 	//Format your date in PHP for MySQL
  41. 	$dt = time();
  42. 	$mysql_datetime = strftime("%Y-%m-%d %H:%M:%S", $dt);
  43. 	echo $mysql_datetime;

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