date anomalies when converting to seconds

[Chris Sheffield]

Jim,

I owe you an apology. You were correct. This problem is tied to  
daylight savings. I realized that after taking your advice and  
looking at the list archives. Fortunately, with some suggestions and  
code from Sarah Reichelt, I was able to workaround the problem, I  
think. Further testing will tell for sure.

So thank you. And thank you, Sarah, for your wonderful DateTime  
library. Saved me a lot of work.

Chris

On May 22, 2006, at 10:37 AM, Jim Ault wrote:

> If you look in the archives, this topic was recently discussed  
> fairly well.
> The operating systems do date and time and daylight savings  
> differently.
> This is inherent in each system.  If these calculations are  
> critical to your
> operation, you should invest a bit of time building a small date-time
> library to add to your distribution.
>
> Hopefully you will find all the data you need to answer your  
> questions,
> especially if you are going to rely on the users computer settings  
> as being
> accurate and in their time zone.
>
> Look at the automatic daylight savings time adjustment for each  
> operating
> system, and in other countries, see which day this is invoked.
>
>
> Jim Ault
> Las Vegas
>
>
> On 5/22/06 8:39 AM, "Chris Sheffield" <cmsheffield at gmail.com> wrote:
>
>> This is one for those of you developing for both Mac and Windows. I'm
>> running into a very strange problem, and I'm not sure if it's a Rev
>> bug or if it has something to do with hardware differences between
>> Macs and PCs.
>>
>> Here's a code snippet:
>>
>> put "01/06/2006" into tDate
>> convert tDate to seconds
>> put tDate
>>
>> Run this in the message box on both a Mac and a PC. See the different
>> results. Anyone know why this would happen? What I'm ultimately doing
>> is converting two dates to seconds and then calculating the number of
>> weeks that have passed between the two dates. I discovered that my
>> calculations were incorrect on the PC, and my debugging led me to
>> this. The value on the Mac seems to be the correct one. What's
>> strange is some dates seem to be correct when converting to seconds,
>> but others are not. Try "04/28/2006" for example. Converting to
>> seconds results in the same value on both platforms.
>>
>> Can anyone help with this? Or does anyone have another way of
>> calculating the number of weeks between two dates without converting
>> to seconds first? Have I found a bug I need to report?
>>
>> Thanks,
>> Chris
>>
>> ------------------------------------------
>> Chris Sheffield
>> Read Naturally
>> The Fluency Company
>> http://www.readnaturally.com
>> ------------------------------------------
>>
>>
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------------------------------------------
Chris Sheffield
Read Naturally
The Fluency Company
http://www.readnaturally.com
------------------------------------------