Incrimenting Dates in C#

  • Thread starter Thread starter Dogmar Hoffman
  • Start date Start date
D

Dogmar Hoffman

Hello,

I am pretty new to C# and have been surfing this forum. It has been a
great help. I am hoping that you can help with this issue:

I have the following:

TimeSpan Diff = new TimeSpan();
Diff = m_EndTime.Subtract(m_StartTime);
//make array to store all the dates to print
for(int j = Diff.Days;j>0;j--)
{
//change to read array in a loop and make each file
FileName = FileDirectory + "\\" + this.m_StartTime.ToString("yyyyMMdd")
+ j + FileIndx.ToString() + ".txt";
}

Basically, I would need to incriment the m_StartTime j times. Then I
need to store them in an array and run through the dates there to create
a filename for each one. Unless there is a better way. The end result
should just be like this:

m_StartDate = 20060303
m_EndDate = 20060306
j = 4

int [] DateArray contains:
[20060303,20060304,20060305,20060306]

and filenames created are:

20060303.txt
20060304.txt
20060305.txt
20060306.txt

If you could help with this, I would greatly appreciate it.

DH
 
Dogmar said:
Hello,

I am pretty new to C# and have been surfing this forum. It has been a
great help. I am hoping that you can help with this issue:

I have the following:

TimeSpan Diff = new TimeSpan();
Diff = m_EndTime.Subtract(m_StartTime);
//make array to store all the dates to print
for(int j = Diff.Days;j>0;j--)
{
//change to read array in a loop and make each file
FileName = FileDirectory + "\\" + this.m_StartTime.ToString("yyyyMMdd")
+ j + FileIndx.ToString() + ".txt";
}

Basically, I would need to incriment the m_StartTime j times. Then I
need to store them in an array and run through the dates there to create
a filename for each one. Unless there is a better way. The end result
should just be like this:

m_StartDate = 20060303
m_EndDate = 20060306
j = 4

int [] DateArray contains:
[20060303,20060304,20060305,20060306]

and filenames created are:

20060303.txt
20060304.txt
20060305.txt
20060306.txt

If you could help with this, I would greatly appreciate it.

DH
Click to expand...

Hello,
DateTime has public methods for addition. Maybe you could use the method
'AddDays' for your problem.

Martin
 
Thank you for the response. So I am using that now, but could this
work?

TimeSpan Diff = new TimeSpan();
Diff = m_EndTime.Subtract(m_StartTime);
double j = Diff.Days;
for(int i =0;i<j;i++)
{
this.m_StartTime = this.m_StartTime.AddDays(i);
FileName = FileDirectory + "\\" + this.m_StartTime.ToString("yyyyMMdd")
+ j + FileIndx.ToString() + ".txt";
}

Right now, it is just creating 1 file with the original m_StartTime as
the title. (so it is adding i when i = 0) I would like it to keep
creating files for each date between m_StartDate and m_EndDate. I just
can not figure out why it will only go through the loop 1 time. Thank
you very much!
 
Hi,

Some problems with your code:

You do not need to instantiate Diff
TimeSpan Diff = new TimeSpan();
Click to expand...
Diff = m_EndTime.Subtract(m_StartTime);
Click to expand...

TimeSpan.Days is integer, why use a double?
double j = Diff.Days;
Click to expand...
for(int i =0;i<j;i++)
{
Click to expand...
// no need for this line, not only that but it;s wrong !
this.m_StartTime = this.m_StartTime.AddDays(i);
Click to expand...

//I changed this line, included: this.StartTime.AddDays( i)
FileName = FileDirectory + "\\" + this.m_StartTime.AddDays(
i).ToString("yyyyMMdd")
+ j + FileIndx.ToString() + ".txt";
}
Click to expand...

It should work now.


Try it
 
Thank you very much.

This is a bit confusing. Here is what it does:

m_StartDate = 20060309
m_EndDate = 20060313

Only one file named 20060312.txt gets created...

The code as it stands is:

TimeSpan Diff = m_EndTime.Subtract(m_StartTime);
int j = Diff.Days;
for(int i =0;i<j;i++)
{
FileName = FileDirectory + "\\" +
this.m_StartTime.AddDays(i).ToString("yyyyMMdd")+ "_" +
FileIndx.ToString() + ".txt";
}

Am I just completely missing the boat here? Thank you again!
 
Dogmar said:
Thank you very much.

This is a bit confusing. Here is what it does:

m_StartDate = 20060309
m_EndDate = 20060313

Only one file named 20060312.txt gets created...

The code as it stands is:

TimeSpan Diff = m_EndTime.Subtract(m_StartTime);
int j = Diff.Days;
for(int i =0;i<j;i++)
{
FileName = FileDirectory + "\\" +
this.m_StartTime.AddDays(i).ToString("yyyyMMdd")+ "_" +
FileIndx.ToString() + ".txt";
}

Am I just completely missing the boat here? Thank you again!
Click to expand...

Where is the code that actually creates the file? It needs to be inside
your loop.
 
Ahh yes. That was it. Now it is working. Thank you all very much!
 
Dogmar Hoffman said:
Hello,

I am pretty new to C# and have been surfing this forum. It has been a
great help. I am hoping that you can help with this issue:

I have the following:

TimeSpan Diff = new TimeSpan();
Diff = m_EndTime.Subtract(m_StartTime);
//make array to store all the dates to print
for(int j = Diff.Days;j>0;j--)
{
//change to read array in a loop and make each file
FileName = FileDirectory + "\\" + this.m_StartTime.ToString("yyyyMMdd")
+ j + FileIndx.ToString() + ".txt";
}

Basically, I would need to incriment the m_StartTime j times. Then I
need to store them in an array and run through the dates there to create
a filename for each one. Unless there is a better way. The end result
should just be like this:
Click to expand...

You can loop through dates like:

for(DateTime dt = startDate; dt <= endDate; dt = dt.AddDays(1))
{
}

SP
 
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