1367 File Timestamp (LastModified) "Z"

Created

07 Apr 2015

Status

TriageNew, and not yet classified. The working group decides whether to take it forward as a technical issue or to close it. Show the workflow

Part

Part 8-1 (2004)

Links

#1369 File Timestamp (LastModified) "Z"

Page

91

Clause

23.1

Paragraph

LastModified

Category

Issue for edition 2 of this part

Issue

Mapping of timestamp is not clear whether timestamp shall specify only UTC time or whether local time can be used.

Standard merely states "MMS LastModified attribute" which permits either timestamp.

Since there is no 61850 (Ed1) mechanism to map local time to UTC, a client cannot interpret local times using only 61850 mechanisms.

Note: This is the only place in 61850 where "local time" seems to be permitted.

Note: This same issue is relevent to 61850-8-1 : 2011(=Ed2)

Proposal

Change text from:
"The IEC 61850-7-2 LastMOdified attribute shall be mapped tothe MMS file LastModified attribute"
to
"The IEC 61850-7-2 LastMOdified attribute shall be mapped tothe MMS file LastModified attribute using UTC semantics (i.e. with a trailing "Z")"