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$first = date('Y-m-01', strtotime('last month'));
$last = date('Y-m-t', strtotime('last month'));
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<?php
$query_date = '2010-02-04';
// First day of the month.
echo date('Y-m-01', strtotime($query_date));
// Last day of the month.
echo date('Y-m-t', strtotime($query_date));
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date('Y-m-01', strtotime('last month'));
date('Y-m-t', strtotime('last month'));
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<?php
// First day of this month
$d = new DateTime('first day of this month');
echo $d->format('jS, F Y');
?>
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$lastDateOfNextMonth =strtotime('last day of next month') ;
$lastDay = date('d/m/Y', $lastDateOfNextMonth);
print_r($lastDay);
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$first_day_this_month = date('m-01-Y'); // hard-coded '01' for first day
$last_day_this_month = date('m-t-Y');
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//get first day of the current month
$start = date("Y-m-1 00:00:00");
//get current date of the month
$end = date("Y-m-d H:i:s");
//query data for the current month so far
$query = $this->db_model->run_query("select column_1, column_2 from table where date_column BETWEEN '".$start."' AND '".$end."'");
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$config_month = 1;
$config_day = 1;
$new_expiry_date = date('Y-m-d', mktime(0, 0, 0, date('m') + $config_month, 1 + $config_day, date('Y')));