diff --git a/AsbCloudApp/Requests/SubsystemOperationTimeRequest.cs b/AsbCloudApp/Requests/SubsystemOperationTimeRequest.cs
index 3a4c3e56..567e11cf 100644
--- a/AsbCloudApp/Requests/SubsystemOperationTimeRequest.cs
+++ b/AsbCloudApp/Requests/SubsystemOperationTimeRequest.cs
@@ -14,7 +14,7 @@ namespace AsbCloudApp.Requests
     public class SubsystemOperationTimeRequest: RequestBase
     {
         /// <summary>
-        /// идентификатор скважины, может не указыватся пользователем
+        /// идентификатор скважины
         /// </summary>
         [Required]
         public int IdWell { get; set; }
diff --git a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
index 07e41895..62ade194 100644
--- a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
+++ b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
@@ -1,5 +1,7 @@
-using AsbCloudApp.Data.Subsystems;
+using AsbCloudApp.Data;
+using AsbCloudApp.Data.Subsystems;
 using AsbCloudApp.Requests;
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
@@ -36,7 +38,15 @@ namespace AsbCloudApp.Services.Subsystems
         /// <param name="request"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<IEnumerable<SubsystemOperationTimeDto>?> GetOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);        
+        Task<IEnumerable<SubsystemOperationTimeDto>?> GetOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);
+
+        /// <summary>
+        /// Временной диапазон за который есть статистика работы подсистем
+        /// </summary>
+        /// <param name="request"></param>
+        /// <param name="token"></param>
+        /// <returns></returns>
+        Task<DatesRangeDto?> GetDateRangeOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token);       
     }
 #nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index 18566010..cbef2343 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -185,6 +185,25 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 
         }
 
+        /// <inheritdoc/>
+        public async Task<DatesRangeDto?> GetDateRangeOperationTimeAsync(SubsystemOperationTimeRequest request, CancellationToken token)
+        {
+            var query = BuildQuery(request);
+            if (query is null)
+            {
+                return null;
+            }
+            var result = await query
+                .GroupBy(o => o.IdTelemetry)
+                .Select(g => new DatesRangeDto
+                {
+                    From = g.Min(o => o.DateStart).DateTime,
+                    To = g.Max(o => o.DateEnd).DateTime
+                })
+                .FirstOrDefaultAsync(token);
+            return result;
+        }
+
         private IQueryable<SubsystemOperationTime>? BuildQuery(SubsystemOperationTimeRequest request)
         {
             var well = wellService.GetOrDefault(request.IdWell);
@@ -249,6 +268,8 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             dto.DateEnd = operationTime.DateEnd.ToRemoteDateTime(well.Timezone.Hours);
             return dto;
         }
+
+        
     }
 #nullable disable
 }
diff --git a/AsbCloudWebApi/Controllers/Subsystems/SubsystemOperationTimeController.cs b/AsbCloudWebApi/Controllers/Subsystems/SubsystemOperationTimeController.cs
index e4466d9d..d86a411f 100644
--- a/AsbCloudWebApi/Controllers/Subsystems/SubsystemOperationTimeController.cs
+++ b/AsbCloudWebApi/Controllers/Subsystems/SubsystemOperationTimeController.cs
@@ -10,6 +10,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using AsbCloudInfrastructure;
 using System;
+using AsbCloudApp.Data;
 
 namespace AsbCloudWebApi.Controllers.Subsystems
 {        
@@ -59,6 +60,19 @@ namespace AsbCloudWebApi.Controllers.Subsystems
             return Ok(result);
         }
 
+        /// <summary>
+        /// получить доступный диапазон дат наработки подсистемы. 
+        /// </summary>
+        [HttpGet("datesRange")]
+        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
+        public async Task<IActionResult> GetDateRangeOperationTimeAsync([FromQuery] SubsystemOperationTimeRequest request, CancellationToken token = default)
+        {
+            if (!await UserHasAccesToWellAsync(request.IdWell, token))
+                return Forbid();                
+            var result = await subsystemOperationTimeService.GetDateRangeOperationTimeAsync(request, token);
+            return Ok(result);
+        }
+
         /// <summary>
         /// получить список наработок подсистем 
         /// </summary>