var tz_LA = try zdt.Timezone.fromTzfile("America/Los_Angeles", allocator);
  defer tz_LA.deinit();
  var tz_Paris = try zdt.Timezone.fromTzfile("Europe/Paris", allocator);
  defer tz_Paris.deinit();

  const a_datetime = try zdt.stringIO.parseISO8601("2022-03-07");
  const this_time_LA = try a_datetime.tzLocalize(tz_LA);
  const this_time_Paris = try this_time_LA.tzConvert(tz_Paris);

  std.debug.print(
      "Time, LA : {s}\n... that's {s} in Paris\n",
      .{ this_time_LA, this_time_Paris },
  );
  // Time, LA : 2022-03-07T00:00:00-08:00
  // ... that's 2022-03-07T09:00:00+01:00 in Paris

  const wall_diff = try this_time_Paris.diffWall(this_time_LA);
  const abs_diff = this_time_Paris.diff(this_time_LA);

  std.debug.print(
      "Wall clock time difference: {s}\nAbsolute time difference: {s}\n",
      .{ wall_diff, abs_diff },
  );
  // Wall clock time difference: PT09H00M00S
  // Absolute time difference: PT00H00M00S

zig build examples && ./zig-out/bin/ex_datetime