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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