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egroupware/phpgwapi/inc/class.datetime.inc.php
Ralf Becker 942a967704 added some docu
2004-05-09 20:01:28 +00:00

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<?php
/**************************************************************************\
* eGroupWare API - Commononly used functions *
* This file written by Dan Kuykendall <seek3r@phpgroupware.org> *
* and Joseph Engo <jengo@phpgroupware.org> *
* and Mark Peters <skeeter@phpgroupware.org> *
* Commononly used functions by phpGroupWare developers *
* Copyright (C) 2000, 2001 Dan Kuykendall *
* -------------------------------------------------------------------------*
* This library is part of the eGroupWare API *
* http://www.egroupware.org *
* ------------------------------------------------------------------------ *
* This library is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 2.1 of the License, *
* or any later version. *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* You should have received a copy of the GNU Lesser General Public License *
* along with this library; if not, write to the Free Software Foundation, *
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
\**************************************************************************/
/* $Id$ */
$d1 = strtolower(@substr(PHPGW_API_INC,0,3));
$d2 = strtolower(@substr(PHPGW_SERVER_ROOT,0,3));
$d3 = strtolower(@substr(PHPGW_APP_INC,0,3));
if($d1 == 'htt' || $d1 == 'ftp' || $d2 == 'htt' || $d2 == 'ftp' || $d3 == 'htt' || $d3 == 'ftp')
{
echo 'Failed attempt to break in via an old Security Hole!<br>'."\n";
exit;
}
unset($d1);
unset($d2);
unset($d3);
/*!
@class datetime
@abstract datetime class that contains common date/time functions
*/
class datetime
{
var $tz_offset;
var $days = Array();
var $days_short = Array();
var $gmtnow = 0;
var $users_localtime;
var $cv_gmtdate;
function datetime()
{
$this->tz_offset = 3600 * (int)@$GLOBALS['phpgw_info']['user']['preferences']['common']['tz_offset'];
print_debug('datetime::datetime::gmtnow',$this->gmtnow,'api');
$error_occured = True;
// If we already have a GMT time, no need to do this again.
if(!$this->gmtnow)
{
if(isset($GLOBALS['phpgw_info']['server']['tz_offset']))
{
$this->gmtnow = time() - ((int)$GLOBALS['phpgw_info']['server']['tz_offset'] * 3600);
print_debug('datetime::datetime::tz_offset',"set via tz_offset=".$GLOBALS['phpgw_info']['server']['tz_offset'].": gmtnow=".date('Y/m/d H:i',$this->gmtnow),'api');
}
else
{
$this->gmtnow = time() - ($this->getbestguess() * 3600);
print_debug('datetime::datetime::bestguess',"set via bestguess=".$this->getbestguess().": gmtnow=".date('Y/m/d H:i',$this->gmtnow),'api');
}
}
$this->users_localtime = time() + $this->tz_offset;
}
function getntpoffset()
{
$error_occured = False;
if(!@is_object($GLOBALS['phpgw']->network))
{
$GLOBALS['phpgw']->network = createobject('phpgwapi.network');
}
$server_time = time();
if($GLOBALS['phpgw']->network->open_port('129.6.15.28',13,5))
{
$line = $GLOBALS['phpgw']->network->bs_read_port(64);
$GLOBALS['phpgw']->network->close_port();
$array = explode(' ',$line);
// host: 129.6.15.28
// Value returned is 52384 02-04-20 13:55:29 50 0 0 9.2 UTC(NIST) *
print_debug('Server datetime',time(),'api');
print_debug('Temporary NTP datetime',$line,'api');
if ($array[5] == 4)
{
$error_occured = True;
}
else
{
$date = explode('-',$array[1]);
$time = explode(':',$array[2]);
$this->gmtnow = mktime((int)$time[0],(int)$time[1],(int)$time[2],(int)$date[1],(int)$date[2],(int)$date[0] + 2000);
print_debug('Temporary RFC epoch',$this->gmtnow,'api');
print_debug('GMT',date('Ymd H:i:s',$this->gmtnow),'api');
}
}
else
{
$error_occured = True;
}
if($error_occured == True)
{
return $this->getbestguess();
}
else
{
return (int)(($server_time - $this->gmtnow) / 3600);
}
}
function gethttpoffset()
{
$error_occured = False;
if(!@is_object($GLOBALS['phpgw']->network))
{
$GLOBALS['phpgw']->network = createobject('phpgwapi.network');
}
$server_time = time();
$filename = 'http://132.163.4.213/timezone.cgi?GMT';
$file = $GLOBALS['phpgw']->network->gethttpsocketfile($filename);
if(!$file)
{
return $this->getbestguess();
}
$time = strip_tags($file[55]);
$date = strip_tags($file[56]);
print_debug('GMT DateTime',$date.' '.$time,'api');
$dt_array = explode(' ',$date);
$temp_datetime = $dt_array[0].' '.substr($dt_array[2],0,-1).' '.substr($dt_array[1],0,3).' '.$dt_array[3].' '.$time.' GMT';
print_debug('Reformulated GMT DateTime',$temp_datetime,'api');
$this->gmtnow = $this->convert_rfc_to_epoch($temp_datetime);
print_debug('this->gmtnow',$this->gmtnow,'api');
print_debug('server time',$server_time,'api');
print_debug('server DateTime',date('D, d M Y H:i:s',$server_time),'api');
return (int)(($server_time - $this->gmtnow) / 3600);
}
function getbestguess()
{
print_debug('datetime::datetime::debug: Inside getting from local server','api');
$server_time = time();
// Calculate GMT time...
// If DST, add 1 hour...
// - (date('I') == 1?3600:0)
$this->gmtnow = $this->convert_rfc_to_epoch(gmdate('D, d M Y H:i:s',$server_time).' GMT');
return (int)(($server_time - $this->gmtnow) / 3600);
}
function convert_rfc_to_epoch($date_str)
{
$comma_pos = strpos($date_str,',');
if($comma_pos)
{
$date_str = substr($date_str,$comma_pos+1);
}
// This may need to be a reference to the different months in native tongue....
$month= array(
'Jan' => 1,
'Feb' => 2,
'Mar' => 3,
'Apr' => 4,
'May' => 5,
'Jun' => 6,
'Jul' => 7,
'Aug' => 8,
'Sep' => 9,
'Oct' => 10,
'Nov' => 11,
'Dec' => 12
);
$dta = array();
$ta = array();
// Convert "15 Jul 2000 20:50:22 +0200" to unixtime
$dta = explode(' ',$date_str);
$ta = explode(':',$dta[4]);
if(substr($dta[5],0,3) <> 'GMT')
{
$tzoffset = substr($dta[5],0,1);
$tzhours = (int)substr($dta[5],1,2);
$tzmins = (int)substr($dta[5],3,2);
switch ($tzoffset)
{
case '-':
(int)$ta[0] += $tzhours;
(int)$ta[1] += $tzmins;
break;
case '+':
(int)$ta[0] -= $tzhours;
(int)$ta[1] -= $tzmins;
break;
}
}
return mktime($ta[0],$ta[1],$ta[2],$month[$dta[2]],$dta[1],$dta[3]);
}
function get_weekday_start($year,$month,$day)
{
$weekday = $this->day_of_week($year,$month,$day);
switch($GLOBALS['phpgw_info']['user']['preferences']['calendar']['weekdaystarts'])
{
// Saturday is for arabic support
case 'Saturday':
$this->days = Array(
0 => 'Sat',
1 => 'Sun',
2 => 'Mon',
3 => 'Tue',
4 => 'Wed',
5 => 'Thu',
6 => 'Fri'
);
$this->days_short = Array(
0 => 'Sa',
1 => 'Su',
2 => 'Mo',
3 => 'Tu',
4 => 'We',
5 => 'Th',
6 => 'Fr'
);
switch($weekday)
{
case 0:
$sday = mktime(2,0,0,$month,$day - 1,$year);
break;
case 6:
$sday = mktime(2,0,0,$month,$day,$year);
break;
default:
$sday = mktime(2,0,0,$month,$day - ($weekday + 1),$year);
break;
}
break;
case 'Monday':
$this->days = Array(
0 => 'Mon',
1 => 'Tue',
2 => 'Wed',
3 => 'Thu',
4 => 'Fri',
5 => 'Sat',
6 => 'Sun'
);
$this->days_short = Array(
0 => 'Mo',
1 => 'Tu',
2 => 'We',
3 => 'Th',
4 => 'Fr',
5 => 'Sa',
6 => 'Su'
);
switch($weekday)
{
case 0:
$sday = mktime(2,0,0,$month,$day - 6,$year);
break;
case 1:
$sday = mktime(2,0,0,$month,$day,$year);
break;
default:
$sday = mktime(2,0,0,$month,$day - ($weekday - 1),$year);
break;
}
break;
case 'Sunday':
default:
$this->days = Array(
0 => 'Sun',
1 => 'Mon',
2 => 'Tue',
3 => 'Wed',
4 => 'Thu',
5 => 'Fri',
6 => 'Sat'
);
$this->days_short = Array(
0 => 'Su',
1 => 'Mo',
2 => 'Tu',
3 => 'We',
4 => 'Th',
5 => 'Fr',
6 => 'Sa'
);
$sday = mktime(2,0,0,$month,$day - $weekday,$year);
break;
}
return $sday - 7200;
}
function is_leap_year($year)
{
if (((int)$year % 4 == 0) && ((int)$year % 100 != 0) || ((int)$year % 400 == 0))
{
return 1;
}
else
{
return 0;
}
}
function days_in_month($month,$year)
{
$days = Array(
1 => 31,
2 => 28 + $this->is_leap_year((int)$year),
3 => 31,
4 => 30,
5 => 31,
6 => 30,
7 => 31,
8 => 31,
9 => 30,
10 => 31,
11 => 30,
12 => 31
);
return $days[(int)$month];
}
function date_valid($year,$month,$day)
{
return checkdate((int)$month,(int)$day,(int)$year);
}
function time_valid($hour,$minutes,$seconds)
{
if((int)$hour < 0 || (int)$hour > 24)
{
return False;
}
if((int)$minutes < 0 || (int)$minutes > 59)
{
return False;
}
if((int)$seconds < 0 || (int)$seconds > 59)
{
return False;
}
return True;
}
function day_of_week($year,$month,$day)
{
if($month > 2)
{
$month -= 2;
}
else
{
$month += 10;
$year--;
}
$day = (floor((13 * $month - 1) / 5) + $day + ($year % 100) + floor(($year % 100) / 4) + floor(($year / 100) / 4) - 2 * floor($year / 100) + 77);
return (($day - 7 * floor($day / 7)));
}
function day_of_year($year,$month,$day)
{
$days = array(0,31,59,90,120,151,181,212,243,273,304,334);
$julian = ($days[$month - 1] + $day);
if($month > 2 && $this->is_leap_year($year))
{
$julian++;
}
return($julian);
}
/*!
@function days_between
@abstract Get the number of days between two dates
@author Steven Cramer/Ralf Becker
@param $m1 - Month_1, $d1 - Day_1, $y1 - Year_1, $m2 - Month_2, $d2 - Day_2, $y2 - Year_2
@note the last param == 0, ensures that the calculation is always done without daylight-saveing
*/
function days_between($m1,$d1,$y1,$m2,$d2,$y2)
{
return (int)((mktime(0,0,0,$m2,$d2,$y2,0) - mktime(0,0,0,$m1,$d1,$y1,0)) / 86400);
}
function date_compare($a_year,$a_month,$a_day,$b_year,$b_month,$b_day)
{
$a_date = mktime(0,0,0,(int)$a_month,(int)$a_day,(int)$a_year);
$b_date = mktime(0,0,0,(int)$b_month,(int)$b_day,(int)$b_year);
if($a_date == $b_date)
{
return 0;
}
elseif($a_date > $b_date)
{
return 1;
}
elseif($a_date < $b_date)
{
return -1;
}
}
function time_compare($a_hour,$a_minute,$a_second,$b_hour,$b_minute,$b_second)
{
// I use the 1970/1/2 to compare the times, as the 1. can get via TZ-offest still
// before 1970/1/1, which is the earliest date allowed on windows
$a_time = mktime((int)$a_hour,(int)$a_minute,(int)$a_second,1,2,1970);
$b_time = mktime((int)$b_hour,(int)$b_minute,(int)$b_second,1,2,1970);
if($a_time == $b_time)
{
return 0;
}
elseif($a_time > $b_time)
{
return 1;
}
elseif($a_time < $b_time)
{
return -1;
}
}
function makegmttime($hour,$minute,$second,$month,$day,$year)
{
return $this->gmtdate(mktime($hour, $minute, $second, $month, $day, $year));
}
// Note common:show_date converts server- to user-time, before it returns the requested format !!!
function localdates($localtime)
{
$date = Array('raw','day','month','year','full','dow','dm','bd');
$date['raw'] = $localtime;
$date['year'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'Y');
$date['month'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'m');
$date['day'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'d');
$date['full'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'Ymd');
$date['bd'] = mktime(0,0,0,$date['month'],$date['day'],$date['year']);
$date['dm'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'dm');
$date['dow'] = $this->day_of_week($date['year'],$date['month'],$date['day']);
$date['hour'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'H');
$date['minute'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'i');
$date['second'] = (int)$GLOBALS['phpgw']->common->show_date($date['raw'],'s');
return $date;
}
function gmtdate($localtime)
{
return $this->localdates($localtime - $this->tz_offset);
}
}
?>
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