2

我从 GPS 跟踪器收到 12 小时时间格式。
例如，GPS 时间：8:25:40在 GMT0（12 小时格式）中
发送的 GPS 时间延迟可能在 1~20 分钟的范围内

从 GPS 接收时间，时区 00:2:15延迟2012-07-27 23:27:55Europe/Moscow

PS：以上数据，我的GPS时间的结果一定是2012-07-27 23:25:40

问题：
如何在我的时区 (Europe/Moscow) 中指定 GPS 时间？

4

3 回答 3

3 
$gps_time      = "9:43:52";
$time_received = "01:45:04 2012-07-28";

$utc    = new DateTimeZone("UTC");
$moscow = new DateTimeZone("Europe/Moscow");

//Instantiate both AM and PM versions of your time
$gps_time_am = new DateTime("$gps_time AM", $utc);
$gps_time_pm = new DateTime("$gps_time PM", $utc);

//Received time
$time_received = new DateTime($time_received, $moscow);

//Change timezone to Moscow
$gps_time_am->setTimezone($moscow);
$gps_time_pm->setTimezone($moscow);

//Check the difference in hours. If it's less than 1 hour difference, it's the correct one.
if ($time_received->diff($gps_time_pm)->h < 1) {
    echo $gps_time_pm->format("H:i:s Y-m-d");
}
else {
    echo $gps_time_am->format("H:i:s Y-m-d");
}

确保指定接收时间的确切日期，以防止出现异常。

PS莫斯科在欧洲。

于 2012-07-27T20:09:38.390 回答
0 
<?php

function correct_time($time)
{
    $yesterday = false;
    $tomorrow = false;

    #offset = abs(date('h') - (int) $time);
    $offset = '3';

    $time_of_day = ($hour < 12)? 'AM': 'PM';

    if($hour < 0)
    {
        $yesterday = true;
        $time_of_day = 'PM';
    }
    if($hour > 12)
    {
        $tomorrow = true;
        $time_of_day = 'AM';       
    }

    $screwed_gps_time = $time . ' ' . $time_of_day;

    $gps_time = new DateTime($screwed_gps_time, new DateTimeZone("Europe/London"));
    if($yesterday)
    {
        $gps_time->sub(new DateInterval('P1D'));
    }
    if($tomorrow)
    {
        $gps_time->add(new DateInterval('P1D'));
    }
    $gps_time->setTimezone(new DateTimeZone("Europe/Moscow"));

    return $gps_time->format("Y-m-d H:i:s");    
}

echo correct_time('8:25:40'); # 2012-07-27 23:25:40
echo correct_time('1:25:40'); # 2012-07-28 04:25:40
echo correct_time('11:25:40'); # 2012-07-28 02:25:40

案例太多，这里就不一一介绍了

于 2012-07-27T20:14:27.283 回答
0

我不记得我所有的 PHP 库，所以

伪代码算法：

AdjustTimeToGPS(gpsTime : 12HourTime, currentTime : DayAndTime, currentTimeZone : TimeZone) : DayAndTime
begin
    gmtCurrentTime : DayAndTime := ConvertToGmt(currentTime, currentTimeZone);
    gmtCurrent12HourTime : 12HourTime := 12HourFromDayAndTime(gmtCurrentTime);
    gpsHour : Hour := GetHourFrom12HourTime(gpsTime); // hour is 0 to 11;
    gmtCurrentHour : Hour := GetHourFrom12HourTime(gmtCurrent12Hour);
    day : Day := GetDayFromDayAndTime(gmtCurrentTime);
    isPm : Boolean = IsPM(gmtCurrentTime);

    if (gmtCurrentHour == 0 AND gpsHour == 11)
    begin    
        // we need to subtract 12 hours
        isPm := Not(isPm);

        if (isPM)
        begin
            // we looped. need to subtract a day
            day := day - 1;
        end
    end

    if (gmtCurrentHour == 11 AND gpsHour == 0)
    begin    
        // we need to add 12 hours
        isPm := Not(isPm);

        if (Not(isPM))
        begin
            // we looped. need to add a day
            day := day + 1;
        end
    end

    return DayAndTimeFrom12Hour(gpsTime, isPM, day);
end
于 2012-07-27T20:28:02.820 回答