- round: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$date = strtotime('2014-01-15');
#$date = '2014-01-15';
echo date('Y-m-d',$date).PHP_EOL;
$daysbefor1979 = '25568';
$start = strtotime("1900-01-01");
echo $start.PHP_EOL;
$diff = ($date - $start);
echo $diff.PHP_EOL;
$days = ($diff / 86400);
echo $days.PHP_EOL;
/*echo date('Y-m-d', jdtounix(gregoriantojd(12, 31, 1899) + 41603)).PHP_EOL;*/
$erg = round(($daysbefor1979+$days), 0);
echo $erg.PHP_EOL;
$days1 = round(($days-$daysbefor1979), 0);
echo $days1.PHP_EOL;
$diff1 = ($day*86400);
echo $diff1.PHP_EOL;