
It seems is.weekend() is unsure ?

# Start R 1.9.0 with --vanilla on windows xp
# load package chron

> table(is.weekend(sapply(1:100, function(i){Sys.sleep(0.05);Sys.time()})))
FALSE  TRUE 
   68    32 
> date()
[1] "Wed May 26 11:18:56 2004"

> version         _              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    1              
minor    9.0            
year     2004           
month    04             
day      12             
language R              
> 


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