如何在 PHP 中将 12 小时制时间转换为 24 小时制时间？

Question

I am using following function and I want time in 24hr clock format but this gives me time in 12hrs:

<?php
date_default_timezone_set('Asia/Kolkata');
$timestamp =  date("d/m/Y h:i:s", time());
print $timestamp ;
?>

What am I doing wrong?

Answer 1

From the docs for date() : The H format character gives the hour in 24h format. Also, you can use G if you do not want the leading 0 for hours before noon.

Examples (if current time was seven-something-AM)
date('H:i:s') -> "07:22:13"
date('G:i:s') -> "7:22:13"

---

For your specific case:

$timestamp = date("d/m/Y H:i:s", time());

Answer 2

根据手册，不同之处在于小时部分的大小写：“h”返回带前导零的 12 小时格式，01 到 12。“H”返回带前导零的小时的 24 小时格式， 01 至 23。

Answer 3

According to the manual , G or H give you the time in 24-hour format. You should read the manual.

date('H', time());

Answer 4

The H format character gives the hour in 24h format. Also, you can use g if you do not want the leading 0 for hours before noon.

// 24-hour time to 12-hour time 
    $time_in_12_hour_format  = date("g:i a", strtotime("13:30"));
    
    // 12-hour time to 24-hour time 
    $time_in_24_hour_format  = date("H:i", strtotime("1:30 PM"));