Get Start Time Query OPC UA HA

[conterden2]

Hello.
I`m trying to get start time in History Trend View.
OPC UA HA 1.02 A2 says:

In some cases Servers are required to return the first available data point for a historical Node; this section
recommends the way that a Client should request this information so that Servers can optimize this call, if
desired. Although there are multiple calls that could return the first data value, the recommended practice will
be to use the StartOfArchive Property. If this Property isn‟t available then use the following
ReadRawModifiedDetails parameters:
ReturnBounds=false
NumValuesPerNode=1
StartTime=DateTime.MinValue+1 second
EndTime= DateTime.MinValue

But, when i'm do query, i`m receive next ReadRawModifiedParams in my server:

ReturnBounds=false
NumValuesPerNode=1
StartTime=01.01.2000 00:00:00 != DateTime.MinValue+1 second
EndTime= 01.01.0001 00::00::00 == DateTime.Min

Is it trouble in UA Expert ?

Thank you,
Denis

[Support Team]

Hello Denis,

we intentionally use different values, as our opinion is that this is the simpler way of retrieving the first data point. There is an open mantis issue adressing this: https://opcfoundation-onlineapplication ... hp?id=3632