Now.date.tostri ng and now.seconds.tos tring() giving different result.

[archana]

Hi all,

I am facing some wired problem while using above mention data type.

What i am doing is i am writing
DateTime.Now.Ho ur.ToString() + ":" + DateTime.Now.Mi nute.ToString() +
":" + DateTime.Now.Se cond.ToString() +
":"+DateTime.No w.Millisecond.T oString()

to the file.

And then after some small processing i am writing
datetime.now.da te.tostring() into file So what i am expecting is time
printed by first line should be less than second line.

But i am getting something strange. what i observered is hours and
minutes printed by both line are same. But second's printed by first
lines are sometimes greated than that of by second line.

Can someone tell me why this is happening. Actually time printed by
second line should be greater than time printed by first line. But in
second's part this is not happening.

Can someone tell me why this is happening.

Please help me.

Thanks in advance.

[Carl Daniel [VC++ MVP]]

archana wrote:

Hi all,

I am facing some wired problem while using above mention data type.

Several comments, see below...

>
What i am doing is i am writing
DateTime.Now.Ho ur.ToString() + ":" + DateTime.Now.Mi nute.ToString() +
":" + DateTime.Now.Se cond.ToString() +
":"+DateTime.No w.Millisecond.T oString()

First off, you have a race condition between your thread and the clock.
DateTime.Now is a dynamic property that's always changing. Here, you're
accessing it 4 times with no assurance that the clock didn't "tick" in
between some of those accesses. You should always take a copy of
DateTime.Now and then work with that copy since it's stable.

DateTime dtNow = DateTime.Now;
dtNow .Hour.ToString( ) +
":" + dtNow .Minute.ToStrin g() +
":" + dtNow .Second.ToStrin g() +
":"+dtNow .Millisecond.To String();

>
to the file.

And then after some small processing i am writing
datetime.now.da te.tostring() into file So what i am expecting is time
printed by first line should be less than second line.

I'm assumiing that you mean DateTime.Now.To String, since
DateTime.Now.Da te.ToString would always print a time of midnight
(00:00:00.000).

>
But i am getting something strange. what i observered is hours and
minutes printed by both line are same. But second's printed by first
lines are sometimes greated than that of by second line.

This is due to the race condition, most likely - your first line actually
printed an incoherent time because the clock "ticked" between some pair of
the 4 separate accesses to DateTime.Now.

>
Can someone tell me why this is happening. Actually time printed by
second line should be greater than time printed by first line. But in
second's part this is not happening.

Can someone tell me why this is happening.

HTH

-cd

[Morten Wennevik]

Hi arcana,

I can't tell you the exact reason for why the second time would be lower
than the first, but as Carl stated, using DateTime.Now several times to
assemble a single date is bad.

A couple of tips:

As Carl said, store the time in a single DateTime

DateTime dt = DateTime.Now;

string time = dt.Hour.ToStrin g() + ":" + dt.Minute.ToStr ing() + ":"
+ dt.Second.ToStr ing() + ":" + dt.Millisecond. ToString();

Even better, when concatenating strings, if you have a single "" inside,
all objects will be called with ToString automatically

string time = dt.Hour + ":" + dt.Minute + ":" + dt.Second + ":"
+ dt.Millisecond;

Event better, the DateTime class already provides means of formatting your
own dates and times

string time = dt.ToString("HH :mm:ss:ffff");

Read this page on how to format DateTimes
http://msdn2.microsoft.com/en-us/lib...ormatinfo.aspx

On Tue, 08 Aug 2006 07:04:36 +0200, archana <tr************ **@yahoo.com>
wrote:

Hi all,

I am facing some wired problem while using above mention data type.

What i am doing is i am writing
DateTime.Now.Ho ur.ToString() + ":" + DateTime.Now.Mi nute.ToString() +
":" + DateTime.Now.Se cond.ToString() +
":"+DateTime.No w.Millisecond.T oString()

to the file.

And then after some small processing i am writing
datetime.now.da te.tostring() into file So what i am expecting is time
printed by first line should be less than second line.

But i am getting something strange. what i observered is hours and
minutes printed by both line are same. But second's printed by first
lines are sometimes greated than that of by second line.

Can someone tell me why this is happening. Actually time printed by
second line should be greater than time printed by first line. But in
second's part this is not happening.

Can someone tell me why this is happening.

Please help me.

Thanks in advance.

--
Happy Coding!
Morten Wennevik [C# MVP]