R version 4.6.0 RC (2026-04-21 r89932 ucrt) -- "Because it was There"
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Platform: x86_64-w64-mingw32/x64

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> 
> library(nanotime)
> 
> format(nanotime(Sys.time()),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2026-04-22T15:45:44.619560003+00:00"
> 
> format(nanotime(as.POSIXlt(Sys.time())),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2026-04-22T15:45:44.646138906+00:00"
>        
> format(nanotime(Sys.Date()),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2026-04-22T00:00:00+00:00"
> 
> 
> 
> proc.time()
   user  system elapsed 
   1.04    0.17    1.17