time stamp bug

[Ray.R]

The UTC would not change the time by 1 second..

(should not change it by 1 sec)

Message Edited by JoeLabView on 07-03-2008 08:30 AM

[mattster]

My problem is related to the time stamp indicator/control

Please note that 00:10:00,0000 (and many other time combinations around 1970) also do not work

[TCPlomp]

I don't have the full answer but Unix started counting time 1-1-1970 00h00 (GMT).

I think there are computational problems around that time.

Ton

[Matti_Autioniemi]

I tested the VI above and had the same problem as well. GMT +2 here. Running LV 8.5.1 and Vista 64bit.

[Ray.R]

Remember the CPU bug with some of the first Pentiums (75MHz?)

It does seem like a computational error.  Have you tried it on another PC?  One that has a different hardware?

R

[mattster]

I think thins one is a LabView error....

I have personally tried in on three separate machines (2 with XP + 1 with vista) and at least two other users from around the world have verified the error...

By the way, look at the Y2K38 bug (http://en.wikipedia.org/wiki/Year_2038_problem) - seems like LabVIEW suffers from the Y2K70 bug as the clock used on linux starts at 1st Jan 2007 and stops at Jan 19th 2038 (for what I can see 2038 seems OK on LabVIEW).  My problem is I need to synchronise a linux database (UTC time staring 1970-01-01) with LabVIEW (UTC time starting in 1904-01-01).

We had a another theory - Does anyone know how LabVIEW handles leap seconds with regards to UTC time (http://en.wikipedia.org/wiki/Leap_seconds)?  Seems like there are a bunch of seconds that simply dissapear from the UTC clock every so often!

[TimUU]

I just came across this bug as well, dates around 1970-01-01 seem problematic. I cannot set the time to 00:00:00 on that day.

Additionally, it seems 'labview epoch' at 1904-01-01 also is problematic. When I set the timestamp to 00:00:00 1904-01-01, the timestamp returns -3600. If I set it to 01:00:00, the timestamp widget resets itself (while the value returned should be 0). I suspect these issues are related.

Summarizing theseissues:

1) Set timestamp date to 1970-01-01 00:00:00

2) Input is ignored and set the date/time to 1970-01-01 01:00:00

3) I expect it to return the date/time I entered

1) Set timestamp to 1904-01-01 00:00:00

2) Timestamp returns -3600

3) I expect it to return 0

1) Set timestamp to 1904-01-01 01:00:00

2) Timestamp resets itself (i.e. 00:00:00 YYYY-MM-DD)

3) I would expect it to return 3600

System used: LabVIEW 2009 SP1, Windows 7 64bit