Split Electricity API days endpoint

src/Electricity.Api/Models/Day.cs

@@ -1,3 +1,5 @@
+using Electricity.Api.Extensions;
+
 namespace Electricity.Api.Models;
 
 public record Day(uint DateTime, double TotalPowerUse, double TotalPowerReturn, double TotalGasUse)
@@ -5,32 +7,17 @@ public record Day(uint DateTime, double TotalPowerUse, double TotalPowerReturn,
     public static Day Empty(DateOnly date)
     {
         return new Day(
-            ConvertToEpoch(date.ToDateTime(new TimeOnly(0, 0), DateTimeKind.Utc)),
+            date.ToDateTime(new TimeOnly(0, 0), DateTimeKind.Utc).ToEpoch(),
             0, 0, 0);
     }
 
     public static Day FromEntity(Entities.ElectricityLog entity)
     {
         return new Day(
-            DateTime: ConvertToEpoch(ParseEntityDateTime(entity.Date, entity.TimeUtc)),
+            DateTime: entity.GetDateTime().ToEpoch(),
             TotalPowerUse: entity.TotalPowerConsumptionDay + entity.TotalPowerConsumptionNight,
             TotalPowerReturn: entity.TotalPowerReturnDay + entity.TotalPowerReturnNight,
             TotalGasUse: entity.GasConsumptionInCubicMeters
         );
     }
-
-    private static DateTime ParseEntityDateTime(string date, string timeUtc)
-    {
-        return System.DateTime
-            .Parse(
-                $"{date}T{timeUtc}Z",
-                null,
-                System.Globalization.DateTimeStyles.AssumeUniversal)
-            .ToUniversalTime();
-    }
-
-    private static uint ConvertToEpoch(DateTime dateTime)
-    {
-        return (uint)Math.Round((dateTime - System.DateTime.UnixEpoch).TotalSeconds);
-    }
 };