How to Get Date Format m-d-Y H:i:s.u from Milliseconds in PHP?

Getting Date Format m-d-Y H:i:s.u from Milliseconds

Imagine you want a formatted date, complete with microseconds, from a UNIX timestamp measured in milliseconds. But you repeatedly end up with 000000 and a result like this:

07-28-2013 11:26:14.000000

The Solution

The solution involves using the input format U.u:

$now = DateTime::createFromFormat('U.u', microtime(true));
echo $now->format("m-d-Y H:i:s.u");

This gives the following output:

04-13-2015 05:56:22.082300

Understanding the Format

From the PHP manual for date formats, we have:

• U: Seconds since the Unix Epoch
• u: Microseconds

Time Zone Considerations

Normally, createFromFormat() uses the local time zone if one is not specified. However, microtime() returns elapsed seconds since the Unix Epoch in UTC, so the DateTime object is implicitly initialized to UTC. This is fine for server-internal tasks, but if you need to display the time for a specific time zone, set the time zone accordingly after initializing the object. Use the setTimeZone() method for this purpose.

Additional Notes

• To input into MySQL, use the following format: format("Y-m-d H:i:s.u")
• The original answer was improved by adding number_format() to the line, which fixes the case with exact seconds.

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