Basic Date rules

dotnet/AipsCore/Domain/Common/Validation/Rules/DateInFutureRule.cs

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+using AipsCore.Domain.Abstract.Rule;
+
+namespace AipsCore.Domain.Common.Validation.Rules;
+
+public class DateInFutureRule : AbstractRule
+{
+    private readonly DateTime _date;
+    private readonly DateTime _now;
+    
+    public DateInFutureRule(DateTime date) 
+    {
+        _date = date;
+        _now = DateTime.Now;
+    }
+    
+    protected override string ErrorCode => "date_in_future";
+    protected override string ErrorMessage => "Date must be in the future";
+    public override bool Validate()
+    {
+        return _date > _now;
+    }
+}

dotnet/AipsCore/Domain/Common/Validation/Rules/DateInPastRule.cs

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+using AipsCore.Domain.Abstract.Rule;
+
+namespace AipsCore.Domain.Common.Validation.Rules;
+
+public class DateInPastRule : AbstractRule
+{
+    private readonly DateTime _date;
+    private readonly DateTime _now;
+
+    public DateInPastRule(DateTime date) 
+    {
+        _date = date;
+        _now = DateTime.Now;
+    }
+    
+    protected override string ErrorCode => "date_in_past";
+    protected override string ErrorMessage => "Date must be in the past";
+    public override bool Validate()
+    {
+        return _date < _now;
+    }
+}