I have an app [iphone], that sends to a server some times [using json], so the times look like hh:mm 24 hour format, the time gets saved in the db as varchar,
I need to calculate the elapsed time = endTime - startTime
but my problem is that I have the time in the db as varchar,, no time stamp,
thanks a lot!
so how to calculate the elapsed time, with out changing the varchar type of field in my db?
You can cast it, but you'd be better off having that as a datetime to start with.
cast(endtime as datetime) - cast(starttime as datetime) -- yields an interval
In PHP:
$json_time = '13:10';
$json_format = 'H:i';
$date = DateTime::createFromFormat($json_format, $json_time);
$mysql_format = 'Y-m-d H:i:s';
echo "Format: $mysql_format; " . $date->format($mysql_format) . "\n";
echo $date->getTimestamp();
Yeilds:
Format: Ymd H:i:s; 2011-06-08 13:10:00
1307495400
Easy:
$start_time = '11:10';
$end_time = '18:55';
$start_time = explode(':', $start_time);
$end_time = explode(':', $end_time);
$elapsed_time = $end_time[0]*60+$end_time[1]-$start_time[0]*60-$start_time[1];
// in minutes.
$elapsed_hours = floor($elapsed_time/60);
$elapsed_minutes = $elapsed_time-$elapsed_hours*60;
print $elapsed_hours.':'.$elapsed_minutes;
// 7:45
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