quirk, cross platform timers lag

[ensegre]

I just ran into this oddity, which might lead me to revise a little a logger of mine. Now, I know of two easy ways of getting a number of seconds from LV:

 

 

The doc is not too eloquent about the high resolution one and its cross-platform implementation, it only says "with 14 digits of precision after the decimal separator". Which would imply, if the representation is double, a span of only something like 100 sec, and this seems not the case (something like 14 significant figures and us resolution instead might be it).

 

What is a quirk is that, if I convert the numbers in linux I get exactly the same time of the day, just a difference of 66 years and a day, not under windows, at the very least on just two machines I have tried. Hence under linux I could use the high precision timer to provide an useful 24h clock too, under windows not. The doc warns that the former is "relative" and "short time", true.

 

 

I think I remember some discussion about, haven't searched yet. I think I was sort of aware that the two OSs use a different time structure for storing the system clock, which is probably exploited differently.

 

ETA: yeah, https://lavag.org/topic/16198-timestamp-behavior/#entry98843 and http://www.ni.com/tutorial/7900/en/ , but they don't explain the 24107 days difference.

 

ETA2: uhm, 1/1/1970 - 1/1/1904 = 24107 days...

Edited July 14, 2015 by ensegre