public async Task <int> Handle(AddOrUpdateTimeZoneCommand command)
{
command.TimeZone.Name.ThrowIfNullOrEmpty("Invalid time zone name parameter", nameof(command.TimeZone.Name));
command.UserId.ThrowIfNotPositiveNonZeroInt("Invalid user id parameter", nameof(command.UserId));
return(await _timeZoneRepository.AddOrUpdateTimeZoneAsync(command.TimeZone, command.UserId).ConfigureAwait(false));
}