要从asp.net mvc中的当前日期时间减去数据库中的日期时间

Question

i want to minus datetime in database table from current datetime and want to compare with greater than(>) operator

i want to compare current datetime and datetime in the database what i want is if my date from database minus current date is greater than 30 days then i want to show my label red else default

here it is what i have tried

       <label style="@(DateTime.Now-item.NewLinen>30 ? "color:red;": "")">New Linen</label>

I am getting red line below this and showing messege

operator cannot be applied to operands of type 'timespan?' and int>

please help me with this

Answer 1

I would usually shift the framing about slightly, and use something like this:

<label style="@((item.NewLinen.HasValue && item.NewLinen.Value.AddDays(30) < DateTime.Now) ? "color:red;": "")">New Linen</label>

But it's more a matter of taste. If you want to use TimeSpan , you need to construct another one to compare against and make it, specifically , 30 days long, not 30 seconds or any other units (which is why direct comparison with int isn't allowed)