public OffsetDateTime On(LocalDate date) => new OffsetDateTime(date.At(time), Offset);
public OffsetDateTime At(LocalTime time) => new OffsetDateTime(date.At(time), offset);
public OffsetDateTime On(LocalDate date) => new OffsetDateTime(date.At(time), Offset);
public OffsetDateTime At(LocalTime time) => new OffsetDateTime(date.At(time), offset);