Hi friend, take the following simple code (vb or c#)

It raises the exception:

The supplied DateTime represents an invalid time. For example,
when the clock is adjusted forward, any time in the period that is
skipped is invalid.
Parameter name: dateTime

Could i have some enlightening on this? (should be related with
daylight)
And how should i modify my loop to proceed normally in the generation
of new dates avoiding the error ?


[BTW i am generating time series of random prices, this is time, the
"x" axis]


-Pam



-----------------------------------------------
Public TimeZoneInfo_LOCAL As TimeZoneInfo = TimeZoneInfo.Local
Public TimeZoneInfo_EDT As TimeZoneInfo =
TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time")

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click

Dim d As New Date(Now.Year, Now.Month, Now.Day)
Do
Dim NewDate = d.AddMinutes(-1)
Dim NewDate_EDT As Date =
TimeZoneInfo.ConvertTime(NewDate, TimeZoneInfo_EDT,
TimeZoneInfo_LOCAL)

d = NewDate
Loop

End Sub
-----------------------------------------------


-----------------------------------------------
public TimeZoneInfo TimeZoneInfo_LOCAL = TimeZoneInfo.Local;
public TimeZoneInfo TimeZoneInfo_EDT =
TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

private void Button1_Click(System.Object sender, System.EventArgs e)
{
System.DateTime d = new System.DateTime(DateAndTime.Now.Year,
DateAndTime.Now.Month, DateAndTime.Now.Day);
do {
dynamic NewDate = d.AddMinutes(-1);
System.DateTime NewDate_EDT = TimeZoneInfo.ConvertTime(NewDate,
TimeZoneInfo_EDT, TimeZoneInfo_LOCAL);

d = NewDate;
} while (true);

}

-----------------------------------------------

Or maybe it's clearer if i pose the question in a time "forward" mode:

This also gives the same error:

--------------------------

Public TimeZoneInfo_LOCAL As TimeZoneInfo = TimeZoneInfo.Local
Public TimeZoneInfo_EDT As TimeZoneInfo =
TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time")

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click


Dim d As New Date(2011, 3, 1)
Do
Dim NewDate = d.AddMinutes(1)
Dim NewDate_EDT As Date =
TimeZoneInfo.ConvertTime(NewDate, TimeZoneInfo_EDT,
TimeZoneInfo_LOCAL)

d = NewDate
Loop

End Sub

--------------------------

I am looking for a way to have the loop proceed normally generating
edt dates (a gap of 1 hour is fine, no problem).

-Pam

On 19-03-2011 09:17, pamela fluente wrote:
> Hi friend, take the following simple code (vb or c#)
>
> It raises the exception:
>
> The supplied DateTime represents an invalid time. For example,
> when the clock is adjusted forward, any time in the period that is
> skipped is invalid.
> Parameter name: dateTime
>
> Could i have some enlightening on this? (should be related with
> daylight)
> And how should i modify my loop to proceed normally in the generation
> of new dates avoiding the error ?
>
> [BTW i am generating time series of random prices, this is time, the
> "x" axis]

If your app is to be able to handle DST changes, then you should
use UTC time internally and only convert to local time in display.

Arne

On 19 Mar, 14:39, Arne Vajhøj <a...@vajhoej.dk> wrote:
> On 19-03-2011 09:17, pamela fluente wrote:
>
>
>
>
>
>
>
>
>
> > Hi friend, take the following simple code (vb or c#)
>
> > It raises the exception:
>
> > * * *The supplied DateTime represents an invalid time. *For example,
> > when the clock is adjusted forward, any time in the period that is
> > skipped is invalid.
> > Parameter name: dateTime
>
> > Could i have some enlightening on this? *(should be related with
> > daylight)
> > And how should i modify my loop to proceed normally in the generation
> > of new dates avoiding the error ?
>
> > [BTW i am generating time series of random prices, this is time, the
> > "x" axis]
>
> If your app is to be able to handle DST changes, then you should
> use UTC time internally and only convert to local time in display.
>
> Arne

Yes. It' seemed just more convenient for me to deal with real dates
because these are real prices.
After all i need only 2 version of dates: LOCAL and EDT when i display
it.
If possible i'd like just to find an easy way to skip the hour. It's
right after all: these are prices randomly generated.

-Pam

On 19 Mar, 17:03, Peter Duniho <NpOeStPe...@NnOwSlPiAnMk.com> wrote:
> On 3/19/11 6:43 AM, pamela fluente wrote:
>
> > [...]
> > If possible i'd like just to find an easy way to skip the hour. It's
> > right after all: these are prices randomly generated.
>
> There is an easy way: use UTC time internally and only convert to local
> time in display.
>
> Hopefully, that advice sounds familiar to you. *
>
> BTW, if you're going to post code in the C# newsgroup, it would be best
> if you would make sure that code is C# code. *If you want help with
> VB.NET code, there's a different forum for that.
>
> Pete

thanks.

(c# and vb.net are the same to me.)

-Pam