Zona horaria predeterminada India PHP
date_default_timezone_set('Asia/Kolkata');
$timestamp = date("Y-m-d H:i:s");
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date_default_timezone_set('Asia/Kolkata');
$timestamp = date("Y-m-d H:i:s");<?php
date_default_timezone_set("Asia/Calcutta"); //India time (GMT+5:30)
echo date('d-m-Y H:i:s');
?>