Ticket #763: Convert.d

module tango.time.Convert;

public import tango.time.Time;

public import tango.sys.win32.Types.di : FILETIME;

long toJavaTime(Time t)
in
{
  // TODO: does java allow negative time?
  assert(t >= Time.epoch1970);
}
body
{
  return (t - Time.epoch1970).millis;
}

Time fromJavaTime(long millis)
in
{
  // TODO: does java allow negative time?
  assert(millis >= 0);
}
body
{
  return Time.epoch1970 + TimeSpan.fromMillis(millis);
}

ulong toUnixTime(Time t)
{
  return cast(ulong)toJavaTime(t) / 1000;
}

Time fromUnixTime(ulong secs)
{
  return fromJavaTime(cast(long)secs * 1000);
}

FILETIME toFILETIME(Time t)
in
{
  assert(t >= Time.epoch1601);
}
body
{
  FILETIME result;
  ulong *ul = cast(ulong *)&result;
  *ul = (t - Time.epoch1601).ticks;
  return result;
}

Time fromFILETIME(FILETIME ft)
in
{
  long *l = cast(long *)&ft;
  assert(*l >= 0);
}
body
{
  ulong *ul = cast(ulong *)&ft;
  return Time.epoch1601 + TimeSpan(*ul);
}