Gettimeofday function to get time elapse from Unix Epoch time

In PHP by using gettimeofday function we can get the time elapsed between current time and Unix Epoch time.

We get an array in return.
Here is the syntax

gettimeofday();

We will try to generate output by using this. Here is the sample code

print_r(gettimeofday());

The output of above code is here

Array
(
    [sec] => 1728150662
    [usec] => 735741
    [minuteswest] => 0
    [dsttime] => 0
)

The first element [sec] gives the time in seconds elapsed between Unix Epoch time and current time.
The second element [usec] gives in microseconds.
[minuteswest] - minutes west of Greenwich
[dsttime] - type of dst correction
All these data are related to server side and not the local time of the client computer.

Getting float data

Instead of an array we can get float value like this.

echo gettimeofday(true);

The output is here.

1728150662.7358

Refresh this page and see how the data is changing

Example 2: Retrieving Time of Day in Seconds and Microseconds

The gettimeofday() function returns the current time, including seconds and microseconds. Here's how to extract both components:

$time = gettimeofday();
echo "Seconds: " . $time['sec'] . "<br>";
echo "Microseconds: " . $time['usec'];

Output

Seconds: 1728150662
Microseconds: 735787

Example 3: Formatting Time with Date()

You can combine gettimeofday() with date() to format the current time:

$time = gettimeofday();
echo date("Y-m-d H:i:s", $time['sec']);

Output , Refresh this page to see the time updates.

2024-10-05 17:51:02

Example 4: Calculating Script Execution Time

Use gettimeofday() to measure script execution time in seconds and microseconds:

$start = gettimeofday();
usleep(500000); // Delay for demonstration
$end = gettimeofday();

$execution_time = ($end['sec'] - $start['sec']) + ($end['usec'] - $start['usec']) / 1000000;
echo "Execution time: " . $execution_time . " seconds";

PHP Date Functions getTimestamp(): Timestamp from date object

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