MySQL DATETIME Helper

Derek Jones edited this page Jul 5, 2012 · 12 revisions
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Category:Helper::Community | Category:Helper::Date | Category:Helper::Database

To enhance CI's date helper with MySQL DATETIME / DATE functionality just create date_helper.php in your application’s helpers directory, paste the original date_helper.php in (to keep its functionality) and then add the following code:

/**
* Convert MySQL's DATE (YYYY-MM-DD) or DATETIME (YYYY-MM-DD hh:mm:ss) to timestamp
*
* Returns the timestamp equivalent of a given DATE/DATETIME
*
* @todo add regex to validate given datetime
* @author Clemens Kofler <clemens.kofler@chello.at>
* @access    public
* @return    integer
*/
function mysqldatetime_to_timestamp($datetime = "")
{
  // function is only applicable for valid MySQL DATETIME (19 characters) and DATE (10 characters)
  $l = strlen($datetime);
    if(!($l == 10 || $l == 19))
      return 0;

    //
    $date = $datetime;
    $hours = 0;
    $minutes = 0;
    $seconds = 0;

    // DATETIME only
    if($l == 19)
    {
      list($date, $time) = explode(" ", $datetime);
      list($hours, $minutes, $seconds) = explode(":", $time);
    }

    list($year, $month, $day) = explode("-", $date);

    return mktime($hours, $minutes, $seconds, $month, $day, $year);
}

/**
* Convert MySQL's DATE (YYYY-MM-DD) or DATETIME (YYYY-MM-DD hh:mm:ss) to date using given format string
*
* Returns the date (format according to given string) of a given DATE/DATETIME
*
* @author Clemens Kofler <clemens.kofler@chello.at>
* @access    public
* @return    integer
*/
function mysqldatetime_to_date($datetime = "", $format = "d.m.Y, H:i:s")
{
    return date($format, mysqldatetime_to_timestamp($datetime));
}

/**
* Convert timestamp to MySQL's DATE or DATETIME (YYYY-MM-DD hh:mm:ss)
*
* Returns the DATE or DATETIME equivalent of a given timestamp
*
* @author Clemens Kofler <clemens.kofler@chello.at>
* @access    public
* @return    string
*/
function timestamp_to_mysqldatetime($timestamp = "", $datetime = true)
{
  if(empty($timestamp) || !is_numeric($timestamp)) $timestamp = time();

    return ($datetime) ? date("Y-m-d H:i:s", $timestamp) : date("Y-m-d", $timestamp);
}

New functions to enhance still more the CI's date helper with MySQL DATETIME / DATE functionality. The procedures continue being the same ones, just add in your date_helper.php, in your application’s helpers directory, the following code:

/**
* Convert timestamp to Human Date
*
* Returns the date (format according to given string) of a given timestamp
*
* @author    Cleiton Francisco V. Gomes <http://www.cleitonfco.com.br/>
* @access    public
* @param     string
* @param     string
* @return    string
*/
function timestamp_to_date($timestamp = "", $format = "d/m/Y H:i:s")
{
  if(empty($timestamp) || !is_numeric($timestamp)) $timestamp = time();
  return date($format, $timestamp);
}

/**
* Convert Human Date to Timestamp
*
* Returns the timestamp equivalent of a given HUMAN DATE/DATETIME
*
* @author    Cleiton Francisco V. Gomes <http://www.cleitonfco.com.br/>
* @access    public
* @param     string
* @return    integer
*/
function date_to_timestamp($datetime = "")
{
  if (!preg_match("/^(\d{1,2})[.\- \/](\d{1,2})[.\- \/](\d{2}(\d{2})?)( (\d{1,2}):(\d{1,2})(:(\d{1,2}))?)?$/", $datetime, $date))
    return FALSE;

  $day = $date[1];
  $month = $date[2];
  $year = $date[3];
  $hour = (empty($date[6])) ? 0 : $date[6];
  $min = (empty($date[7])) ? 0 : $date[7];
  $sec = (empty($date[9])) ? 0 : $date[9];

  return mktime($hour, $min, $sec, $month, $day, $year);
}

/**
* Convert HUMAN DATE to MySQL's DATE or DATETIME (YYYY-MM-DD hh:mm:ss)
*
* Returns the DATE or DATETIME equivalent of a given HUMAN DATE/DATETIME
*
* @author    Cleiton Francisco V. Gomes <http://www.cleitonfco.com.br/>
* @access    public
* @param     string
* @param     boolean
* @return    string
*/
function date_to_mysqldatetime($date = "", $datetime = TRUE)
{
  return timestamp_to_mysqldatetime(date_to_timestamp($date), $datetime);
}