title: Calculation of the number of microseconds in Ada
body: <p>in C langage we have get_usec() which gives us the number of microseconds since the start of the current second.
  -Speaking of the &quot;current second&quot; necessarily refers to time reference which is often EpochTime.
  -In Ada.Calendar package, I see Seconds or Clocks functions by example with ability to split &amp; get the seconds.
  But how to get the number of microseconds since the start of the current second, please?
  Thanks
  Mark</p>