echo date('Y-m-d H:i:s',time());
date_default_timezone_set('PRC'); //默认时区
echo "今天:",date("Y-m-d",time()),"
";
echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"
";
echo "昨天:",date("Y-m-d",strtotime("-1 day")), "
";
echo "明天:",date("Y-m-d",strtotime("+1 day")), "
";
echo "一周后:",date("Y-m-d",strtotime("+1 week")), "
";
echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "
";
echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "
";
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."
";
echo "一个月前:".date("Y-m-d",strtotime("last month"))."
";
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."
";
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."
";
echo (strtotime('2020-5-20′)-strtotime(date(“Y-m-d”)))/86400;
$hour=date('G',time());
echo 19<=$hour||$hour>6?'当前时间在下午7点之后或早上6点之前':'当前时间不在指定时间段内';