This small library enables you to make time calculations with microseconds precisions. PHP's built-in DateTime and DateInterval classes will not do that. Except that DateTime does keep microseconds, but will ignore those in its calculations.

Require this library via composer.

Use in the same way as you would DateTime. The classes extend DateTime, so you can substitute your legacy classes where needed.

Example:

$dtToday = new \DateTimeMS();
$dtTomorrow = clone $dtToday;
$dtTomorrow->modify("+1 day -1 microsecond");
$interval = $dtToday->diff($dtTomorrow);
print "In between {$dtToday->format('D, H:i:s.u')} and the same second tomorrow
    are $interval->format('%d days, %h hrs, %i mins, %secs and %u microsecs')."

• The comparison operators (< > = etc) do not account for microseconds. (Which is impossible to achieve due to nonexistence of PHP operator overloading.)
• DateTimeMS::modify cannot be used to set microseconds explicitly.
• DateIntervalMS::modify is not implemented.

• Improve DateTimeMS::modify
• Implement DateIntervalMS::modify
• Expand the unit tests.
• Test and think about performance.