std.datetime for month integer

[dsmith]

Recall that std.date used the following to retrieve a month in integer form (0 .. 11):

  auto Now = std.date.getUTCtime();
  writeln(std.date.monthFromTime(Now));

Using std.datetime, the following yields the abbreviated month name:

  auto Now = Clock.currTime();
  writefln("%s", Now.month);    // --> jul

Now, how can std.datetime be used to print the month in integer form?