Incorrect Lastupdatetime of Azure digital twin

Xuezhou Hou 25

Hello everyone,

I have uploaded data to the Azure Digital Twin cloud and want to get the lastUpdateTime (TimeStamp) of the Digital Twin instance. However, after updating over 90000 json patches twice, I retrieved one digital twin instance always with the incorrect lastUpdateTime, which is even earlier than my recorded timestamp. All other eight instances have no such issue. Any ideas what could cause this issue? Could it be because of internal processes?

After that i tried several times the other day and this time another digital instance has the same problem.

I appreciate for any help. Thanks in advance.

Sander van de Velde 29,616 Reputation points MVP

2023-08-31T20:46:20.02+00:00

Hello @Xuezhou Hou,

welcome to this moderated community forum.

To make it easier for members to answer your question, can you share some context?

Which region are you using?

Can you share the model or at least the context id (dtdl version)?
Xuezhou Hou 25 Reputation points

2023-09-01T08:28:37.1533333+00:00

@Sander van de Velde Thanks for informing. Here are some data i would like to share:

The 1st screenshot shows the timestamp i recorded before executing UpdateDigitalClient in my program while there are 10901 times data update for each digital twin instance (in total 9 instances). The data update of all 9 instances was performed one by one (PositionJoint1, PositionJoint2, ... ).

2nd screenshot shows the update timestamp in Azure digital twin data explorer of the problematic instance updatetime.

3rd Screenshot shows the delay between both and the row 2, 11, 20... always have negative delays which does not appear in other instances.

Anyone has an idea of the possible reasons? Thanks a lot!
Xuezhou Hou 25 Reputation points

2023-09-01T08:53:51.6566667+00:00

And btw I am using dtdl v2 and the local timezone is Europe/Berlin.
Sander van de Velde 29,616 Reputation points MVP

2023-09-01T09:40:01.8733333+00:00

Hello @Xuezhou Hou,

your resources are created in the Azure region 'West Europe'?
Xuezhou Hou 25 Reputation points

2023-09-01T11:44:21.53+00:00

@Sander van de Velde Yes exactly.
Xuezhou Hou 25 Reputation points

2023-09-01T11:45:08.03+00:00

@Sander van de Velde Yes exactly.
LeelaRajeshSayana-MSFT 13,951 Reputation points

2023-09-11T21:30:32.7066667+00:00

Hi @Xuezhou Hou For a deeper investigation and immediate assistance on this issue, please file a support request @ https://aka.ms/azsupt? If you do not have access to a support plan, could you please send an email to azcommunity@microsoft.com with the below details, so that we can work closely on this matter.

Thread URL: Link to this thread.

Azure Subscription ID:

Email Subject : Attn Leela

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Incorrect Lastupdatetime of Azure digital twin