diff --git a/Api.SeaHavenIndustries.Tests/WorkOrderDataServiceTimestampTests.cs b/Api.SeaHavenIndustries.Tests/WorkOrderDataServiceTimestampTests.cs
new file mode 100644
index 0000000..512ad0e
--- /dev/null
+++ b/Api.SeaHavenIndustries.Tests/WorkOrderDataServiceTimestampTests.cs
@@ -0,0 +1,68 @@
+using Data.SeaHavenIndustries;
+using FluentAssertions;
+using Microsoft.EntityFrameworkCore;
+using SeaHaven.DataServices.Implementation;
+using Xunit;
+
+namespace Api.SeaHavenIndustries.Tests;
+
+/// <summary>
+/// The SLA clock and every "created"/"modified" display read these stamps as UTC, so the data layer
+/// must never write local server time into them.
+/// </summary>
+public class WorkOrderDataServiceTimestampTests
+{
+    private static ApplicationDbContext NewContext()
+    {
+        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+        return new ApplicationDbContext(options);
+    }
+
+    private static WorkOrder NewWorkOrder() =>
+        new() { InternalWONumber = "WO-1", WorkerOrderTitle = "Leak", LocationId = 100 };
+
+    [Fact]
+    public async Task AddAsync_KeepsTheCreationTimeTheCallerSet()
+    {
+        await using var context = NewContext();
+        var createdAt = new DateTime(2026, 9, 25, 14, 0, 0, DateTimeKind.Utc);
+        var workOrder = NewWorkOrder();
+        workOrder.CreatedDate = createdAt;
+
+        var saved = await new WorkOrderDataService(context).AddAsync(workOrder);
+
+        saved.CreatedDate.Should().Be(createdAt);
+        saved.CreatedDate!.Value.Kind.Should().Be(DateTimeKind.Utc);
+        (await context.workOrders.SingleAsync()).CreatedDate.Should().Be(createdAt);
+    }
+
+    [Fact]
+    public async Task AddAsync_StampsUtcWhenTheCallerSetNoCreationTime()
+    {
+        await using var context = NewContext();
+        var before = DateTime.UtcNow;
+
+        var saved = await new WorkOrderDataService(context).AddAsync(NewWorkOrder());
+
+        saved.CreatedDate.Should().NotBeNull();
+        saved.CreatedDate!.Value.Kind.Should().Be(DateTimeKind.Utc);
+        saved.CreatedDate.Value.Should().BeOnOrAfter(before).And.BeOnOrBefore(DateTime.UtcNow);
+    }
+
+    [Fact]
+    public async Task UpdateAsync_StampsTheModificationTimeInUtc()
+    {
+        await using var context = NewContext();
+        var service = new WorkOrderDataService(context);
+        var saved = await service.AddAsync(NewWorkOrder());
+        var before = DateTime.UtcNow;
+
+        await service.UpdateAsync(saved);
+
+        saved.LastModificationTime.Should().NotBeNull();
+        saved.LastModificationTime!.Value.Kind.Should().Be(DateTimeKind.Utc);
+        saved.LastModificationTime.Value.Should().BeOnOrAfter(before).And.BeOnOrBefore(DateTime.UtcNow);
+    }
+}
diff --git a/SeaHaven.DataServices/Implementation/AccountDataService.cs b/SeaHaven.DataServices/Implementation/AccountDataService.cs
index 5b00af2..ec2f874 100644
--- a/SeaHaven.DataServices/Implementation/AccountDataService.cs
+++ b/SeaHaven.DataServices/Implementation/AccountDataService.cs
@@ -64,7 +64,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Accounts> AddAsync(Accounts account)
         {
-            account.CreatedDate = DateTime.Now;
+            account.CreatedDate = DateTime.UtcNow;
             await _context.Accounts.AddAsync(account);
             await _context.SaveChangesAsync();
             return account;
@@ -72,7 +72,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Accounts account)
         {
-            account.LastModificationTime = DateTime.Now;
+            account.LastModificationTime = DateTime.UtcNow;
             _context.Accounts.Update(account);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/AssetDataService.cs b/SeaHaven.DataServices/Implementation/AssetDataService.cs
index 93a3f1e..1d60a7d 100644
--- a/SeaHaven.DataServices/Implementation/AssetDataService.cs
+++ b/SeaHaven.DataServices/Implementation/AssetDataService.cs
@@ -72,7 +72,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Assets> AddAsync(Assets asset)
         {
-            asset.CreatedDate = DateTime.Now;
+            asset.CreatedDate = DateTime.UtcNow;
             await _context.Assets.AddAsync(asset);
             await _context.SaveChangesAsync();
             return asset;
@@ -80,7 +80,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Assets asset)
         {
-            asset.LastModificationTime = DateTime.Now;
+            asset.LastModificationTime = DateTime.UtcNow;
             _context.Assets.Update(asset);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/CategoryDataService.cs b/SeaHaven.DataServices/Implementation/CategoryDataService.cs
index c5af096..994acc3 100644
--- a/SeaHaven.DataServices/Implementation/CategoryDataService.cs
+++ b/SeaHaven.DataServices/Implementation/CategoryDataService.cs
@@ -25,7 +25,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Category> AddAsync(Category category)
         {
-            category.CreatedDate = DateTime.Now;
+            category.CreatedDate = DateTime.UtcNow;
             await _context.Categories.AddAsync(category);
             await _context.SaveChangesAsync();
             return category;
@@ -33,7 +33,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Category category)
         {
-            category.LastModificationTime = DateTime.Now;
+            category.LastModificationTime = DateTime.UtcNow;
             _context.Categories.Update(category);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/ContactDataService.cs b/SeaHaven.DataServices/Implementation/ContactDataService.cs
index 8196d2b..e4abf4f 100644
--- a/SeaHaven.DataServices/Implementation/ContactDataService.cs
+++ b/SeaHaven.DataServices/Implementation/ContactDataService.cs
@@ -100,7 +100,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Contacts> AddAsync(Contacts contact)
         {
-            contact.CreatedDate = DateTime.Now;
+            contact.CreatedDate = DateTime.UtcNow;
             await _context.Contacts.AddAsync(contact);
             await _context.SaveChangesAsync();
             return contact;
@@ -108,7 +108,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Contacts contact)
         {
-            contact.LastModificationTime = DateTime.Now;
+            contact.LastModificationTime = DateTime.UtcNow;
             _context.Contacts.Update(contact);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/DispatchDataService.cs b/SeaHaven.DataServices/Implementation/DispatchDataService.cs
index 3274713..398051d 100644
--- a/SeaHaven.DataServices/Implementation/DispatchDataService.cs
+++ b/SeaHaven.DataServices/Implementation/DispatchDataService.cs
@@ -85,7 +85,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Dispatch> AddAsync(Dispatch dispatch)
         {
-            dispatch.CreatedDate = DateTime.Now;
+            dispatch.CreatedDate = DateTime.UtcNow;
             await _context.Dispatches.AddAsync(dispatch);
             await _context.SaveChangesAsync();
             return dispatch;
@@ -93,7 +93,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Dispatch dispatch)
         {
-            dispatch.LastModificationTime = DateTime.Now;
+            dispatch.LastModificationTime = DateTime.UtcNow;
             _context.Dispatches.Update(dispatch);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/EmployeeDataService.cs b/SeaHaven.DataServices/Implementation/EmployeeDataService.cs
index 4606d11..7b0b2c7 100644
--- a/SeaHaven.DataServices/Implementation/EmployeeDataService.cs
+++ b/SeaHaven.DataServices/Implementation/EmployeeDataService.cs
@@ -72,7 +72,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Employee> AddAsync(Employee employee)
         {
-            employee.CreatedDate = DateTime.Now;
+            employee.CreatedDate = DateTime.UtcNow;
             await _context.Employees.AddAsync(employee);
             await _context.SaveChangesAsync();
             return employee;
@@ -80,7 +80,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Employee employee)
         {
-            employee.LastModificationTime = DateTime.Now;
+            employee.LastModificationTime = DateTime.UtcNow;
             _context.Employees.Update(employee);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/FollowUpDataService.cs b/SeaHaven.DataServices/Implementation/FollowUpDataService.cs
index 4eebe82..72ef131 100644
--- a/SeaHaven.DataServices/Implementation/FollowUpDataService.cs
+++ b/SeaHaven.DataServices/Implementation/FollowUpDataService.cs
@@ -88,7 +88,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<FollowUps> AddAsync(FollowUps followUp)
         {
-            followUp.CreatedDate = DateTime.Now;
+            followUp.CreatedDate = DateTime.UtcNow;
             await _context.FollowUps.AddAsync(followUp);
             await _context.SaveChangesAsync();
             return followUp;
@@ -96,7 +96,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(FollowUps followUp)
         {
-            followUp.LastModificationTime = DateTime.Now;
+            followUp.LastModificationTime = DateTime.UtcNow;
             _context.FollowUps.Update(followUp);
             await _context.SaveChangesAsync();
         }
@@ -218,7 +218,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<FollowUps> AddAsync(FollowUps followUp, CancellationToken cancellationToken)
         {
-            followUp.CreatedDate = DateTime.Now;
+            followUp.CreatedDate = DateTime.UtcNow;
             await _context.FollowUps.AddAsync(followUp, cancellationToken);
             await _context.SaveChangesAsync(cancellationToken);
             return followUp;
@@ -226,7 +226,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(FollowUps followUp, CancellationToken cancellationToken)
         {
-            followUp.LastModificationTime = DateTime.Now;
+            followUp.LastModificationTime = DateTime.UtcNow;
             _context.FollowUps.Update(followUp);
             await _context.SaveChangesAsync(cancellationToken);
         }
@@ -238,7 +238,7 @@ namespace SeaHaven.DataServices.Implementation
                 return false;
 
             entity.Status = status;
-            entity.LastModificationTime = DateTime.Now;
+            entity.LastModificationTime = DateTime.UtcNow;
             await _context.SaveChangesAsync(cancellationToken);
             return true;
         }
diff --git a/SeaHaven.DataServices/Implementation/LocationDataService.cs b/SeaHaven.DataServices/Implementation/LocationDataService.cs
index 11cb89e..b331a01 100644
--- a/SeaHaven.DataServices/Implementation/LocationDataService.cs
+++ b/SeaHaven.DataServices/Implementation/LocationDataService.cs
@@ -98,7 +98,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Locations> AddAsync(Locations location)
         {
-            location.CreatedDate = DateTime.Now;
+            location.CreatedDate = DateTime.UtcNow;
             await _context.Locations.AddAsync(location);
             await _context.SaveChangesAsync();
             return location;
@@ -106,7 +106,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Locations location)
         {
-            location.LastModificationTime = DateTime.Now;
+            location.LastModificationTime = DateTime.UtcNow;
             _context.Locations.Update(location);
             await _context.SaveChangesAsync();
         }
@@ -228,7 +228,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<Locations> AddAsync(Locations location, CancellationToken cancellationToken)
         {
-            location.CreatedDate = DateTime.Now;
+            location.CreatedDate = DateTime.UtcNow;
             await _context.Locations.AddAsync(location, cancellationToken);
             await _context.SaveChangesAsync(cancellationToken);
             return location;
@@ -236,7 +236,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(Locations location, CancellationToken cancellationToken)
         {
-            location.LastModificationTime = DateTime.Now;
+            location.LastModificationTime = DateTime.UtcNow;
             _context.Locations.Update(location);
             await _context.SaveChangesAsync(cancellationToken);
         }
@@ -249,7 +249,7 @@ namespace SeaHaven.DataServices.Implementation
             if (entity == null)
                 return false;
 
-            var now = DateTime.Now;
+            var now = DateTime.UtcNow;
             foreach (var contact in entity.Contacts ?? Enumerable.Empty<Contacts>())
             {
                 if (contact.IsDeleted != true)
diff --git a/SeaHaven.DataServices/Implementation/PMScheduleDataService.cs b/SeaHaven.DataServices/Implementation/PMScheduleDataService.cs
index a2418ea..6bc925a 100644
--- a/SeaHaven.DataServices/Implementation/PMScheduleDataService.cs
+++ b/SeaHaven.DataServices/Implementation/PMScheduleDataService.cs
@@ -64,7 +64,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<PMSchedules> AddAsync(PMSchedules schedule)
         {
-            schedule.CreatedDate = DateTime.Now;
+            schedule.CreatedDate = DateTime.UtcNow;
             await _context.PMSchedules.AddAsync(schedule);
             await _context.SaveChangesAsync();
             return schedule;
@@ -72,7 +72,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(PMSchedules schedule)
         {
-            schedule.LastModificationTime = DateTime.Now;
+            schedule.LastModificationTime = DateTime.UtcNow;
             _context.PMSchedules.Update(schedule);
             await _context.SaveChangesAsync();
         }
diff --git a/SeaHaven.DataServices/Implementation/WorkOrderDataService.cs b/SeaHaven.DataServices/Implementation/WorkOrderDataService.cs
index d32b77b..b34db11 100644
--- a/SeaHaven.DataServices/Implementation/WorkOrderDataService.cs
+++ b/SeaHaven.DataServices/Implementation/WorkOrderDataService.cs
@@ -193,7 +193,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task<WorkOrder> AddAsync(WorkOrder workOrder)
         {
-            workOrder.CreatedDate = DateTime.Now;
+            workOrder.CreatedDate ??= DateTime.UtcNow;
             await _context.workOrders.AddAsync(workOrder);
             await _context.SaveChangesAsync();
             return workOrder;
@@ -201,7 +201,7 @@ namespace SeaHaven.DataServices.Implementation
 
         public async Task UpdateAsync(WorkOrder workOrder)
         {
-            workOrder.LastModificationTime = DateTime.Now;
+            workOrder.LastModificationTime = DateTime.UtcNow;
             _context.workOrders.Update(workOrder);
             await _context.SaveChangesAsync();
         }