Subtracting a time stamp from another time stamp...

[Share_Good]

hi... take a look at the attached VI.should give me only 0,006 sec or 0,007 secbut gives me 1hr 0min 0,006 sec...how?


T1-T2_LV8.2.1.vi:
http://forums.ni.com/attachments/ni/170/346974/1/T1-T2_LV8.2.1.vi

[devchander]

If u observe the output of subtraction function, it will show '0.0069999' or 6-7 milliseconds as the difference ( which is what you expect)
But then, you are converting that into timestamp which is the time-zone-independent number of seconds that have elapsed since 12:00 a.m., Friday, January 1, 1904, Universal Time.
Hence the incorrect result
 

[Share_Good]

Hi Dev... thanks a lot...i did realize that the difference is correct in terms of float.but i was unaware that the time stamp is time-zone-independant.i tried by changing the timezone...it worked perfect...now it is clear to me... thanks...

[smercurio_fc]

Interestingly enough, on my system I get something completely different:<img src="Loading Image..."> Amusing.Message Edited by smercurio_fc on 08-06-2008 10:58 AM


T1-T2_LV8.2.1_FP.png:
http://forums.ni.com/attachments/ni/170/347149/1/T1-T2_LV8.2.1_FP.png

[johnsold]

I think you sent a negative number to the timestamp indicator? Some combination of the difference, daylight savings time and time zones. Lynn

[tst]

If you want to see the relative time, you need to create a DBL&nbsp;indicator after the substraction, right click it, select Display Format... and change the format to relative time.

[smercurio_fc]

johnsold wrote:I think you sent a negative number to the timestamp indicator? Some combination of the difference, daylight savings time and time zones.To be honest, I didn't investigate it. I was just curious to see what would happen, and I just left it at that.