On the Palm, TimGetSeconds() returns a local timestamp and you have to use TimTimeZoneToUTC() to get the UTC(GMT) time.
In Windows, the time() function returns a UTC timestamp and then you can use the localtime() function to convert it to local time. So to fix my problem I save the timestamp on the Palm as UTC time then in my conduit I subtract 2082844800 (Palm time to Windows time conversion). Now I have a Windows UTC timestamp so I just call localtime() to get the local time. "Logan Shaw" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Jim McGowen wrote: > >> That's what I was thinking... but both the palm and the pc are set to the >> same time zone so I don't understand why. If this is the case then >> either >> the Palm is giving me a timestamp from some other time zone or the PC is >> interpreting the timestamp as being in some other timezone. I don't get >> it... a timestamp is a timestamp why would time zones even matter? > > Ultimately most computers run some sort of clock and supply > functions to give you the local time or UTC (a/k/a GMT) time, > depending which you want. > > The question is, does that native clock that the OS uses work > in local time or in UTC? In which case is it converting -- when > you ask for local, or when you ask for UTC? > > The other question, is the answer to the previous question the > same for Palm OS and for Windows? > > > To put all this another way, the documentation for Palm OS's > TimGetSeconds() says it returns "the number of seconds elapsed > from 12:00 A.M. on January 1, 1904 to the current date and time". > But is that 12:00AM, 1/1/1904 *local* time or UTC? What about > the analogous function call on Windows? > > > Based on http://www.decimaltime.hynes.net/computers.html , > it would appear that Windows keeps time relative to a certain > UTC time. So, the next question is whether Palm OS keeps time > in UTC or not. Based on OS 4.0 example source, it seems that > TimSecondsToDateTime() takes no account of time zones, and > I believe you get the local time if you do > > TimSecondsToDateTime (TimGetSeconds(), datetimeptr); > > Therefore, it seems like TimGetSeconds() is giving you the > number of seconds since the clock struck 12:00AM on 1/1/1904 > in YOUR time zone. I don't know what function call you're > using on Windows, so I can tell whether it uses local time, > but if it isn't, you're going to have to do time zone > correction. > > So, I *think* what you need to do is use the example code > in the TimTimeZoneToUTC() documentation to convert > TimGetSeconds() time to UTC. > > - Logan > -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
