From 0b419ec3c614aa5f979928b97314ec4705333079 Mon Sep 17 00:00:00 2001
From: eugeniy_ivanov <ea.ivanov@digitaldrilling.ru>
Date: Thu, 20 Oct 2022 12:44:24 +0500
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---
 .../Subsystems/SubsystemOperationTimeService.cs   | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index 18566010..1961c74f 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -185,6 +185,21 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 
         }
 
+        private (DateTimeOffset, DateTimeOffset) GetDateRangeOperationTime(int idSubsystem)
+        {
+            var dateRange = db.SubsystemOperationTimes
+                .Where(o => o.Id == idSubsystem)
+                .GroupBy(o => o.IdSubsystem)
+                .Select(g => new
+                {
+                    DateFirst = g.Min(o => o.DateStart),
+                    DateLast = g.Max(o => o.DateEnd)
+                })
+                .FirstOrDefault();           
+            (DateTimeOffset dateFirst, DateTimeOffset dateLast) result = (dateRange.DateFirst, dateRange.DateLast);
+            return result;
+        }
+
         private IQueryable<SubsystemOperationTime>? BuildQuery(SubsystemOperationTimeRequest request)
         {
             var well = wellService.GetOrDefault(request.IdWell);