diff --git a/AsbCloudApp/Data/WellOperationDto.cs b/AsbCloudApp/Data/WellOperationDto.cs
index f2a2d65f..e21471ce 100644
--- a/AsbCloudApp/Data/WellOperationDto.cs
+++ b/AsbCloudApp/Data/WellOperationDto.cs
@@ -1,5 +1,5 @@
-using AsbCloudApp.Validation;
-using System;
+using System;
+using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 
 namespace AsbCloudApp.Data
@@ -7,7 +7,7 @@ namespace AsbCloudApp.Data
     /// <summary>
     /// Операции на скважине (заведенные пользователем)
     /// </summary>
-    public class WellOperationDto : ItemInfoDto, IId, IWellRelated
+    public class WellOperationDto : ItemInfoDto, IId, IWellRelated, IValidatableObject
     {
         /// <inheritdoc/>
         public int Id { get; set; }
@@ -86,8 +86,8 @@ namespace AsbCloudApp.Data
         /// <summary>
         /// Дата начала операции
         /// </summary>
-        [DateValidation(GtDate = "2010-01-01T00:00:00")]
-        public DateTime DateStart { get; set; }
+        
+        public DateTimeOffset DateStart { get; set; }
 
         /// <summary>
         /// Продолжительность, часы
@@ -100,5 +100,24 @@ namespace AsbCloudApp.Data
         /// </summary>
         [StringLength(4096, ErrorMessage = "Комментарий не может быть длиннее 4096 символов")]
         public string? Comment { get; set; }
+
+        /// <summary>
+        /// Валидация даты
+        /// </summary>
+        /// <param name="validationContext"></param>
+        /// <returns></returns>
+        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+        {
+            if (!(DateStart is DateTimeOffset dateTimeOffset))
+                yield return new ValidationResult(
+                    $"{nameof(DateStart)}: дата DateStart указана не в формате DateTimeOffset",
+                    new[] { nameof(DateStart) });
+
+            var gtDate = new DateTimeOffset(2010, 1, 1, 0, 0, 0, TimeSpan.Zero);
+            if (DateStart <= gtDate)
+                yield return new ValidationResult(
+                    $"{nameof(DateStart)}: DateStart не может быть меньше {gtDate}",
+                    new[] { nameof(DateStart) });
+        }
     }
 }
diff --git a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
index fbc94e02..fb0a8c12 100644
--- a/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
+++ b/AsbCloudInfrastructure/Repository/WellOperationRepository.cs
@@ -347,7 +347,7 @@ public class WellOperationRepository : IWellOperationRepository
         {
             var entity = dto.Adapt<WellOperation>();
             entity.Id = default;
-            entity.DateStart = dto.DateStart.ToUtcDateTimeOffset(timezone.Hours);
+            entity.DateStart = dto.DateStart.ToUniversalTime();
             entity.IdWell = idWell;
             db.WellOperations.Add(entity);
         }
@@ -365,7 +365,7 @@ public class WellOperationRepository : IWellOperationRepository
     {
         var timezone = wellService.GetTimezone(dto.IdWell);
         var entity = dto.Adapt<WellOperation>();
-        entity.DateStart = dto.DateStart.ToUtcDateTimeOffset(timezone.Hours);
+        entity.DateStart = dto.DateStart.ToUniversalTime();
         db.WellOperations.Update(entity);
 
         var result = await db.SaveChangesAsync(token);
@@ -449,7 +449,6 @@ public class WellOperationRepository : IWellOperationRepository
 
             CategoryName = o.OperationCategory.Name,
             WellSectionTypeName = o.WellSectionType.Caption,
-
             DateStart = DateTime.SpecifyKind(o.DateStart.UtcDateTime + timeZoneOffset, DateTimeKind.Unspecified),
             DepthStart = o.DepthStart,
             DepthEnd = o.DepthEnd,
diff --git a/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs b/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
index d46bfff1..f1c44ec3 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
@@ -140,7 +140,7 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
                 .Select(t => t.Fact!)
                 .ToList();
 
-            DateTime lastFactDate = default;
+            DateTimeOffset lastFactDate = default;
             var lastFactI = 0;
 
             int i = 0;
@@ -290,7 +290,7 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
 
             static DateTime GetEndDate(WellOperationDto operation)
                 => operation is not null
-                ? operation.DateStart.AddHours(operation.DurationHours)
+                ? operation.DateStart.Date.AddHours(operation.DurationHours)
                 : default;
 
             var endDatePlan = planLast is not null ? GetEndDate(planLast) : default;
diff --git a/AsbCloudWebApi.Tests/UnitTests/Services/DailyReportServiceTest.cs b/AsbCloudWebApi.Tests/UnitTests/Services/DailyReportServiceTest.cs
index b75b6947..d635d53d 100644
--- a/AsbCloudWebApi.Tests/UnitTests/Services/DailyReportServiceTest.cs
+++ b/AsbCloudWebApi.Tests/UnitTests/Services/DailyReportServiceTest.cs
@@ -238,8 +238,8 @@ public class DailyReportServiceTest
 
 		fakeDatesRange = new DatesRangeDto
 		{
-			From = fakeFirstFactWellOperation.DateStart,
-			To = fakeLastFactWellOperation.DateStart
+			From = fakeFirstFactWellOperation.DateStart.Date,
+			To = fakeLastFactWellOperation.DateStart.Date
 		};
 
 		dailyReportService = new DailyReportService(wellServiceMock,