datetime-moq.cs

public class UberQualityService
{
    public async bool SaveCustomer(string data)
    {       
        if (data != null)
        {
            var customer = JsonConvert.DeserializeObject<Customer>(data);
            if(DateTime.Today.DayOfWeek == DayOfWeek.Friday)
            {
                //Database save logic
                return true;
            }
            else
            {
                return false;
            }
        }            
    }
}