I have a PHP DateTime object with microseconds created as follows:
$time = microtime(true); $microseconds = sprintf('%06d', ($time - floor($time)) * 1000000); $dt = new DateTime(date('Y-m-d H:i:s.' . $microseconds, $time));
How can I modify the microseconds value of $dt
, without creating a completely new DateTime instance?
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Answer
You can’t.
There are three methods that can modify the value of a DateTime
instance: add
, sub
and modify
. We can rule out add
and sub
immediately because they work in terms of a DateInterval
which does not have sub-second precision.
modify
accepts a string in one of the standard recognized formats. Of those formats, only the relative ones are of interest here because the other ones work in an absolute manner; and there is no relative format that allows tweaking the msec part (that unit is not recognized).