Question

How to cast yyyy-MM-dd format to ISO8601 date format

Asked by: lussier

Hi I have to format date to the iso 8601 format. I'm using AS400 who returns the date to the format "yyyy-MM-dd" and time as "hh:mm:ss".

How can I in VB or C++ get my date as the ISO 8601 format (yyyy-MM-ddThh:mm:ss.0000000-TZD)?

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Asked On
2008-04-07 at 07:06:51ID23301361
Tags

Visual Basic, VBScript, C++

Topics

Programming for iSeries / AS400

,

VB Script

,

C++ Programming Language

Participating Experts
4
Points
500
Comments
11

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Answers

 

by: s_sarigulPosted on 2008-04-07 at 07:23:05ID: 21297154

You can use format function in VB like that;
************************************
Dim GetDate As String
GetDate=format(now,"yyyy-MM-ddThh:mm:ss.0000000-TZD")
************************************

and with using format function u can get every type of date or currency or time formats

 

by: Infinity08Posted on 2008-04-07 at 07:38:41ID: 21297317

In C++ :

        #include <ctime>

        time_t now = time(0);
        char timestamp[64] = { 0 };
        strftime(timestamp, 32, "%Y-%m-%dT%H:%M:%S.0000000-TZD", localtime(&now));

 

by: s_sarigulPosted on 2008-04-07 at 07:40:27ID: 21297336

He can use this code with both VB.net or VB6

************************************
Dim GetDate As String
GetDate=format(now,"yyyy-MM-ddThh:mm:ss.0000000-TZD")
************************************

 

by: Infinity08Posted on 2008-04-07 at 07:40:44ID: 21297341

Or if you just want to format the two given strings into a larger string :

        std::string date;    // in "yyyy-MM-dd" format
        std::string time;    // int "hh:mm:ss" format

        std::stringstream ss("");
        ss << date << "T" << time << ".0000000-TZD";

        std::string timestamp = ss.str();

 

by: lussierPosted on 2008-04-07 at 12:43:31ID: 21299933

Hi I'm using Plex 6.0. So I need a VBScript (.vbs) or a C++ Function.

I don't have problem getting the Now() date, it's when I have a set date
Ex 2008-03-03 at 10:00 am, I need to send the DateTime as 2008-03-03T10:00:00.0000000-05:00
The last part (-05:00) is the time difference between here (Montréal) and Greenwich. But since we do not change the time at the same date, 2 weeks ago the difference was -04:00.

I understand how to format a date, but I can'T fine anything to cast my String Date and my String Time to timestamp.

In VBScript I could find a function that gave me the TDZ value.
In C++ I have problem with the cast of an ObDate and an ObTime.

 

by: maatthiasPosted on 2008-04-07 at 13:28:25ID: 21300283

Do I understand this correctly...

AS400 returns a timestamp that is not adjusted for time zone and only to a precision of a second.  AS400 always returns Montreal time.  But you always want to store the UTC.  So if AS400 returns today at 16:00 in Montreal you want to store "2008-04-07T21:00:00.0000000-05:00".  Is that correct?

 

by: lussierPosted on 2008-04-08 at 05:34:36ID: 21304505

No!

The ISO 8601 last part (-05:00) is the time difference between here (mtl) and Greenwich
So the format is
mydate + "T" + mtTime + milisec + TimeZoneDifference
Today at noon would be 2008-04-08T12:00:00.0000000-05:00 because there is 5 hours difference between here and Greenwich, but a month ago at noon would be 2008-03-08T12:00:00.0000000-04:00
because a month ago the time zone difference was 4 hours.

 

by: maatthiasPosted on 2008-04-08 at 08:44:47ID: 21306378

What time is the AS/400 reporting?  mtTime or GMT?  Do you have a historical dataset that you need to convert?  Or is this an on-going function you require?  Both?  VBscript is straight-forward enough to convert but you would need to custom set the date ranges and change each year.  For example, for 2008 you might have the following.  Note that the DayOfYear checking is hypothetical.  I didn't check exactly when GMT went to daylight savings time this year.  Enough to get the idea:


 
'This script is customized for 2008
 
Option Explicit
Dim TheDate, GetDate, DayOfYear, HourDiff
 
TheDate = "7/7/2008 16:00:00"
 
DayOfYear = DatePart("y", TheDate)
 
If DayOfYear <= 98 Then
	HourDiff = 5
ElseIf DayOfYear <= 150 Then
	HourDiff = 4
ElseIf DayOfYear <= 200 Then
	HourDiff = 5
Else
	HourDiff = 4
End If
 
TheDate = DateAdd("h", HourDiff, TheDate)
 
GetDate = DatePart("yyyy", TheDate) & "-" & Right("0" & DatePart("m", TheDate), 2) & "-" & Right("0" & DatePart("d", TheDate), 2) _
	& "T" & Right("0" & DatePart("h", TheDate),2) & ":" & Right("0" & DatePart("n", TheDate), 2) & ":" & Right("0" & DatePart("s", TheDate), 2) _
	& ".0000000-0" & HourDiff & ":00"
 
MsgBox(GetDate)

                                              
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by: maatthiasPosted on 2008-04-08 at 08:46:51ID: 21306412

Depending upon which time the AS/400 reports we may have to add a negative sign in the code.  I await your reply.

 

by: tliottaPosted on 2008-04-08 at 12:50:30ID: 21308917

lussier:

Can you clarify what you're receiving from the AS/400? Are you trying to receive the time from the AS/400, or are you running queries that have date/time or timestamps as columns in the result set?

What are you actually calling on the AS/400? Are you directly querying tables? Are you calling stored procs? Something else?

There are far too many possibilities and little to go on to provide a good response. Maybe the best answer is simply to get the AS/400 to return what you want, but it's not possible to tell yet.

Tom

20120131-EE-VQP-002

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