[DFDL-WG] Fw: OPC-UA DateTime values

[Steve Hanson]

Requirement to allow DFDL to understand Windows FILETIME type as well as 
Unix time type. 

Although DFDL allows the epoch to be specified via 
dfdl:binaryCalendarEpoch, it can only handle seconds or milliseconds. 

It would need to add a new binaryCalendarRep 'binaryTick' to handle the 
'100 nanoseconds' units. 

Regards
 
Steve Hanson
IBM Hybrid Integration, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh at uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
----- Forwarded by Steve Hanson/UK/IBM on 12/12/2017 09:48 -----

From:   Andreas Martens1/UK/IBM
To:     Steve Hanson/UK/IBM at IBMGB
Date:   08/12/2017 17:48
Subject:        OPC-UA DateTime values



Hi Steve,
 
I'm working on processing OPC-UA DateTime elements, which are specified 
by:
"A 64-bit signed integer representing the number of 100 nanoseconds 
intervals since 1601-01-01 00:00:00. This is the same as the WIN32 
FILETIME type."
(From OPC UA Part 3 - Address Space Model 1.03 Specification, available 
from opcfoundation.org)
 
Now they might have been a bit conservative on the truth, here's 
Micosoft's specification:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms724284(v=vs.85).aspx
Which doesn't mention whether it's signed or not (in fact, it's split in 
two parts, potentially to maintain compatibility backwards (have thay 
always used 1601 as their epoch?))
 
typedef struct _FILETIME {
  DWORD dwLowDateTime;
  DWORD dwHighDateTime;
} FILETIME, *PFILETIME;
actually, DWORD is unsigned, so it's definitely unsigned, so OPC 
foundation are liars!
 
cheers,
Andreas
--
Andreas Martens
Emerging Technology
IBM Research
IBM Hursley Park, Winchester, SO21 2JN

Phone: +44 (0) 1962 816833 37246833
www.emerging-technology.co.uk
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20171212/59f8a29a/attachment.html>