Re: UTC Date Format

[Bryan Dietz <BDietz@xxxxxxxxxx>]

That makes sence.  I was using the website mentioned (
http://www.onlineconversion.com/unix_time.htm ) and playing around with
some dates, both present and past ones.  I was not thinking that the way
the unix time stamp is used for "current" times.


----------------------------
Bryan Dietz



midrange-l-bounces@xxxxxxxxxxxx wrote on 06/01/2004 04:35:57 AM:

>
> Hi Bryan,
>
> >
> > How would this program work for date before 01/01/1970.  They are
negative
> > numbers.
> >
>
> I don't think I've ever seen a unix-date from before 1970?!  Normally,
> these dates are used for things like the system time, the last time a
file
> was updated, or created, or when a log entry is created.  Normally these
> can't be before 1970, since the operating system that created the date
> wasn't around before 1970!
>
> Obviously for dates like birth dates, etc, that can be older than this,
> you'll want to use a different date format.  Especially since a 32-bit
> integer is very limited in range, you can only represent dates from
> December 13, 1901 to Jan 19, 2038.
>
> Still, if you wanted to, for some reason, use this type of code with
> negative numbers, you could do so by adding an "if" to the code.  If the
> number is less than 0, convert it to positive (0 - myvar) and then use
the
> SUBDUR op-code instead of the ADDDUR opcode.
>

>