检查印度的当前时间是否在php中的特定时间范围内 - check if current time in India is between a particular time range in php

check if current time in India is between a particular time range in php

我过去常常包含一些依赖类来更改时区。但如何在不添加任何依赖的情况下在PHP中实现呢?如何检查印度的当前时间[例如]是否在特定的时间范围内，并显示适当的消息

EDIT bcoz of downvotes:我自己提供了这个问题的答案，这就是我发布这个问题的原因，以便将来帮助别人。这就是为什么这个问题看起来没有任何努力/没有代码的原因，正如我在我的回答中解释的那样。

<?php
date_default_timezone_set('Asia/Calcutta');
//echo date('Y-m-d h-i-s');  // prints 2015-08-25

$currentTime = time();
// if you want to check the hour only. This can also be checked via mktime(16, 0, 0)
if (((int) date('H', $currentTime)) >= 16) {
    echo "current time is greater than 4pm";
} else {
    echo "current time is less than 4 pm";
}
// if you want to check the hour and minute together
if($currentTime > mktime(16, 29, 0)) {
    echo " We're sorry, This service is available only before 4pm";
} else {
    echo "";
}
// if you want to check the hour and minute together in a range
if($currentTime < mktime(6, 0, 0) || $currentTime > mktime(16, 30, 0)) {
    echo " We're sorry, This service is available only between 6 AM and 4:30 PM";
} else {
    echo "";
}
// check if current date/time is greater than a particular date/time
if (new DateTime() > new DateTime("2015-08-26 16:00:00")) {
    # current time is greater than 2015-08-25 16:00:00
    echo "This coupon is expired.";
}
?>