If this has been started but not stopped, obtains the time since the timer was started.
If this has been stopped, obtains the elapsed time between the time it was started and the time it was
stopped. The return value is the number of seconds elapsed, including any fractional part. The
microseconds out parameter is
return location for the fractional part of seconds elapsed, in microseconds (that is, the total number of microseconds elapsed, modulo 1000000), or null
seconds elapsed as a floating point value, including any fractional part.