Add a start time to the job and task

src/ApiService/ApiService/OneFuzzTypes/Model.cs

@@ -978,7 +978,9 @@ public record Job(
     StoredUserInfo? UserInfo,
     string? Error = null,
     DateTimeOffset? EndTime = null
-) : StatefulEntityBase<JobState>(State) { }
+) : StatefulEntityBase<JobState>(State) {
+
+}
 
 // This is like UserInfo but lacks the UPN:
 public record StoredUserInfo(Guid? ApplicationId, Guid? ObjectId);

src/ApiService/ApiService/OneFuzzTypes/Responses.cs

@@ -52,7 +52,9 @@ public record TaskSearchResult(
     List<NodeAssignment> Nodes,
     [property: JsonPropertyName("Timestamp")] // must retain capital T for backcompat
     DateTimeOffset? Timestamp
-) : BaseResponse();
+) : BaseResponse() {
+    public DateTimeOffset? StartTime => EndTime is DateTimeOffset endTime ? endTime.Subtract(TimeSpan.FromHours(Config.Task.Duration)) : null;
+}
 
 public record BoolResult(
     bool Result
@@ -113,6 +115,7 @@ public static JobResponse ForJob(Job j, IEnumerable<IJobTaskInfo>? taskInfo)
             UserInfo: j.UserInfo,
             Timestamp: j.Timestamp
         );
+    public DateTimeOffset? StartTime => EndTime is DateTimeOffset endTime ? endTime.Subtract(TimeSpan.FromHours(Config.Duration)) : null;
 }
 
 public record PoolGetResult(

src/pytypes/onefuzztypes/models.py

@@ -747,6 +747,7 @@ class Task(BaseModel):
     events: Optional[List[TaskEventSummary]]
     nodes: Optional[List[NodeAssignment]]
     user_info: Optional[UserInfo]
+    start_time: Optional[datetime] = None
 
 
 class Job(BaseModel):
@@ -758,6 +759,7 @@ class Job(BaseModel):
     end_time: Optional[datetime] = None
     task_info: Optional[List[Union[Task, JobTaskInfo]]]
     user_info: Optional[UserInfo]
+    start_time: Optional[datetime] = None
 
 
 class NetworkConfig(BaseModel):