diff --git a/AsbCloudApp/Data/WellDto.cs b/AsbCloudApp/Data/WellDto.cs
index d88aa631..c1b9a22b 100644
--- a/AsbCloudApp/Data/WellDto.cs
+++ b/AsbCloudApp/Data/WellDto.cs
@@ -50,6 +50,11 @@ namespace AsbCloudApp.Data
         /// </summary>
         public int IdState { get; set; }
 
+        /// <summary>
+        /// Дата/время первой операции
+        /// </summary>
+        public DateTime? StartDate { get; set; }
+
         /// <summary>
         /// Дата/время кода приходили данные последний раз
         /// </summary>
diff --git a/AsbCloudApp/Services/IWellOperationService.cs b/AsbCloudApp/Services/IWellOperationService.cs
index 475ea9bd..d3d3a310 100644
--- a/AsbCloudApp/Services/IWellOperationService.cs
+++ b/AsbCloudApp/Services/IWellOperationService.cs
@@ -33,5 +33,6 @@ namespace AsbCloudApp.Services
 
         Task<int> DeleteAsync(IEnumerable<int> ids, CancellationToken token);
         IDictionary<int, string> GetSectionTypes();
+        DateTimeOffset? FirstOperationDate(int idWell);
     }
 }
diff --git a/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs b/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
index b552717e..55979e96 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/WellOperationService.cs
@@ -19,6 +19,8 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
         private readonly CacheTable<WellOperationCategory> cachedOperationCategories;
         private readonly CacheTable<WellSectionType> cachedSectionTypes;
 
+        private Dictionary<int, DateTimeOffset?>? firstOperationsCache = null;
+
         public const int idOperationBhaAssembly = 1025;
         public const int idOperationBhaDisassembly = 1026;
         public const int idOperationNonProductiveTime = 1043;
@@ -49,6 +51,26 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
             return result;
         }
 
+        public DateTimeOffset? FirstOperationDate(int idWell)
+        {
+            if(firstOperationsCache is null)
+            {
+                var query = db.WellOperations
+                .GroupBy(o => o.IdWell)
+                .Select(g => new Tuple<int, DateTimeOffset?, DateTimeOffset?>
+                (
+                    g.Key,
+                    g.Where(o => o.IdType == idOperationTypePlan).Min(o => o.DateStart),
+                    g.Where(o => o.IdType == idOperationTypeFact).Min(o => o.DateStart)
+                ));
+
+                firstOperationsCache = query
+                    .ToDictionary(f => f.Item1, f => f.Item3 ?? f.Item2);
+            }
+
+            return firstOperationsCache?.GetValueOrDefault(idWell);
+        }
+
         public async Task<PaginationContainer<WellOperationDto>> GetOperationsAsync(
             int idWell,
             int? operationType = default,
diff --git a/AsbCloudInfrastructure/Services/WellService.cs b/AsbCloudInfrastructure/Services/WellService.cs
index ebe5ca84..44085c81 100644
--- a/AsbCloudInfrastructure/Services/WellService.cs
+++ b/AsbCloudInfrastructure/Services/WellService.cs
@@ -29,6 +29,7 @@ namespace AsbCloudInfrastructure.Services
         private readonly CacheTable<RelationCompanyWell> cacheRelationCompaniesWells;
         private readonly CacheTable<CompanyType> cacheCompanyWellTypes;
         private readonly ITimezoneService timezoneService;
+        private readonly Lazy<IWellOperationService> wellOperationService;
 
         public ITelemetryService TelemetryService => telemetryService;
 
@@ -37,6 +38,7 @@ namespace AsbCloudInfrastructure.Services
         {
             this.telemetryService = telemetryService;
             this.timezoneService = timezoneService;
+            this.wellOperationService = new Lazy<IWellOperationService>(() => new WellOperationService.WellOperationService(db, cacheDb, this));
             cacheRelationCompaniesWells = cacheDb.GetCachedTable<RelationCompanyWell>((AsbCloudDbContext)db, nameof(RelationCompanyWell.Company), nameof(RelationCompanyWell.Well));
             cacheCompanyWellTypes = cacheDb.GetCachedTable<CompanyType>((AsbCloudDbContext)db);
             Includes.Add($"{nameof(Well.Cluster)}.{nameof(Cluster.Deposit)}");
@@ -48,7 +50,7 @@ namespace AsbCloudInfrastructure.Services
         public DateTimeOffset GetLastTelemetryDate(int idWell)
         {
             var well = Cache.FirstOrDefault(w => w.Id == idWell);
-
+            
             if (well?.IdTelemetry is null)
                 return DateTimeOffset.MinValue;
 
@@ -63,7 +65,7 @@ namespace AsbCloudInfrastructure.Services
 
             var wellsIds = relations.Select(r => r.IdWell);
             var wells = await Cache.WhereAsync(w => wellsIds.Contains(w.Id), token);
-
+            
             var dtos = wells.Select(Convert);
             return dtos;
         }
@@ -202,6 +204,7 @@ namespace AsbCloudInfrastructure.Services
                 if (TryGetTimezone(entity, out var timezone))
                     dto.Timezone = timezone;
 
+            dto.StartDate = wellOperationService.Value.FirstOperationDate(entity.Id)?.ToRemoteDateTime(dto.Timezone.Hours);
             dto.WellType = entity.WellType?.Caption;
             dto.Cluster = entity.Cluster?.Caption;
             dto.Deposit = entity.Cluster?.Deposit?.Caption;
diff --git a/ConsoleApp1/Program.cs b/ConsoleApp1/Program.cs
index fe92aa60..33142088 100644
--- a/ConsoleApp1/Program.cs
+++ b/ConsoleApp1/Program.cs
@@ -6,21 +6,35 @@ using System.Linq;
 
 namespace ConsoleApp1
 {
+    class Cron
+    {
+        public DateTimeOffset Origin { get; set; }
+        public TimeSpan Period { get; set; }
+
+        public DateTimeOffset Next()
+        {
+            var delta = DateTimeOffset.Now - Origin;
+            var n = Math.Ceiling(delta / Period);
+            return Origin + n * Period;
+        }
+    }
+
     class Program
     {
         static void Main(/*string[] args*/)
         {
             // use ServiceFactory to make services
-            var db = ServiceFactory.Context;
-            //var d = db.TelemetryDataSaubStats.ToList();
+            var op = ServiceFactory.MakeWellOperationsService();
+            var d = op.FirstOperationDate(90);
 
-            //db.RefreshMaterializedViewAsync<TelemetryDataSaubStat>().Wait();
+            var period = TimeSpan.FromHours(5);
+            var c = new Cron
+            {
+                Period = period,
+                Origin = new DateTimeOffset(2022, 5, 8, 0, 0, 7, TimeSpan.FromHours(5)),
+            };
 
-            var d = db.WellSectionTypes
-                .Include(e => e.DrillParamsCollection)
-                .Include(e => e.WellComposites)
-                .Include(e => e.WellOperations)
-                .ToList();
+            Console.WriteLine($"origin: {c.Origin}   next: {c.Next()}");
 
             Console.WriteLine("End of Test");
             Console.ReadLine();
diff --git a/ConsoleApp1/ServiceFactory.cs b/ConsoleApp1/ServiceFactory.cs
index b71f727e..41cbd9a8 100644
--- a/ConsoleApp1/ServiceFactory.cs
+++ b/ConsoleApp1/ServiceFactory.cs
@@ -70,6 +70,9 @@ namespace ConsoleApp1
         public static WellService MakeWellService() 
             => new WellService(Context, CacheDb, MakeTelemetryService(), TimezoneService);
 
+        public static WellOperationService MakeWellOperationsService()
+            => new WellOperationService(Context, CacheDb, MakeWellService());
+
         public static OperationsStatService MakeOperationsStatService()
             => new OperationsStatService(Context, CacheDb, MakeWellService());