<?php
/**
* convert PHP date format string to normalized string
* 
* @param string $SourceFormat PHP Date format string
* @return string			  String representing a normalized date format
*/
function GetStdFormat($SourceFormat)
{
  $temp = $SourceFormat;
  
  $temp = str_replace("Y","YYYY",$temp);  
  $temp = str_replace("m","MM",$temp);
  $temp = str_replace("d","DD",$temp);

  $temp = str_replace("n","MM",$temp);
  $temp = str_replace("j","DD",$temp);
  $temp = str_replace("y","YYYY",$temp);

  return $temp;
}

/**
 * determines the order date fields are listed in the format
 * 
 * @param string $format    normalized date format 
 * @param string $field     date field, ('year','month', or 'day')
 * @return integer          field position: 0, 1 or 2
*/ 
function DateFieldOrder($format,$field)
{
  $pos["year"] = strpos($format,"YYYY");
  $pos["month"] = strpos($format,"MM");
  $pos["day"] = strpos($format,"DD");
  asort($pos);
  $i=1;
  $fpos = 0;
  foreach($pos as $f => $val)
  {
      if($f==$field)
      {      
          $fpos = $i;
          break;      
      }
      $i++;      
  }
  return $fpos;
}
                     
/**
 * splits the date into its parts
 * 
 * @param string $date             date in string form
 * @param string $SourceFormat     PHP Date formatting string
 * @return Array                   Assoc. array containg date fields 
*/ 
function GetDateArray($date,$SourceFormat)
{
  $temp_format = GetStdFormat($SourceFormat);
  $parts = preg_split("/\s*\D\s*/",$date);
 
  $fpos = DateFieldOrder($temp_format,"year");
  if($fpos>0)
    $year = $parts[$fpos-1];

  $fpos = DateFieldOrder($temp_format,"month");  
  if($fpos>0)
    $month = $parts[$fpos-1];

  $fpos = DateFieldOrder($temp_format,"day");

  if($fpos>0)
    $day = $parts[$fpos-1];
  
  $date_parts = array();
  $date_parts["year"] = $year;
  $date_parts["month"] = $month;
  $date_parts["day"] = $day;

  return $date_parts;
}

/**
 * convert date to Unix timestamp
 * 
 * @param string $date             date in string form
 * @param string $SourceFormat     PHP Date formatting string
 * @return integer                 Unix Timestamp of date
*/
function DateTimestamp($date,$SourceFormat)
{
	if(strlen($date))
	{
  		$d = GetDateArray($date,$SourceFormat);
  		$ticks = adodb_mktime(0,0,0,$d["month"],$d["day"],$d["year"]);
	}
	else
	  $ticks = 0;
  
  return $ticks;
}
  
/**
 * convert date from one string format to another
 * 
 * @param string $date             date in string form
 * @param string $SourceFormat     PHP Date formatting string
 * @param string $DestFormat       PHP Date formatting string to return
 * @return string                  reformatted date string
*/
function ReformatDate($date,$SourceFormat,$DestFormat)
{
  $unixtime = DateTimestamp($date,$SourceFormat);
  if($unixtime>0)
      $newdate = adodb_date($DestFormat,$unixtime);
  return $newdate;
}

/**
 * Number of days in the month of a given date
 * 
 * @param integer $date             timestamp to check
 * @return string                  Number of days in month
*/
function DaysInMonth($date)
{
    return adodb_date("t",$date);
}

/**
 * Checks a date for validity
 * 
 * @param integer $date      date  to check
 * @param string $format     PHP Date formatting string
 * @return boolean          
*/
function ValidDate($date,$format)
{
    $valid = TRUE;
    $d = GetDateArray($date,$format);
    $valid = $valid && ((int)$d["year"]>0);
    $valid = $valid && ((int)$d["month"]>0);
    if($valid)
    {    
      $day = (int)$d["day"];
      $checkdays = adodb_mktime(0,0,0,$d["month"],1,$d["year"]);
      $days = DaysInMonth($checkdays);
      $valid = $valid && (($day>0) && ($day<=$days));
    }
    return $valid;
}

function Is12HourTime($timestr)
{
    $timestr = strtoupper($timestr);
    return (strpos($timestr,"AM")>0 || strpos($timestr,"PM")>0);       
}


function GetTimeParts($timestr)
{
    if(Is12HourTime($timestr))
    {
        /* parse 12 hr clock */
        list ($hour,$min,$sec,$ampm) = split('[: ]',$timestr);
        if($ampm=="PM" && $hour != 12)
            $hour = $hour + 12;
        if($ampm=="AM" && $hour==12)
            $hour=0;

        $time = sprintf("%02d:%02d:%02d",$hour,$min,$sec);

    }
    else
        $time = $timestr;
    $parts = explode(":",$time);
    return $parts;
}

function ValidTime($timestr)
{
    global $objConfig;

    $timestr = strtoupper($timestr);
    if($objConfig->Get("ampm_time")=="1")
    {
      $valid = Is12HourTime($timestr);
    }
    else
        $valid = !Is12HourTime($timestr);

    $time = GetTimeParts($timestr);
    $valid = $valid && (($time["hour"]<24) && ($time["min"]<60) && ($time["sec"]<60));
    $valid = $valid && (($time["hour"]>-1) && ($time["min"]>-1) && ($time["sec"]>-1));
    return $valid;
}

function SecondsSinceMidnight($timestr)
{
    $timestr = strtoupper($timestr);
    $time = GetTimeParts($timestr);
//    echo $timestr."<br>\n";
//    print_r($time);
    $ticks = $time[2] + ($time[1]*60) + ($time[0]*3600);
    return $ticks;
}
/*
  $date = "10-03-71";
  $source_format = "m-d-y";
  print "date:". ReformatDate($date,$source_format,"m/d/Y")."<br>\n";
  if(ValidDate($date,"Y.m.d"))
     echo " Date is valid<br>\n";
*/     
?>