R Under development (unstable) (2024-06-18 r86781 ucrt) -- "Unsuffered Consequences"
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> 
> library(nanotime)
> 
> format(nanotime(Sys.time()),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2024-06-19T11:40:02.706886053+00:00"
> 
> format(nanotime(as.POSIXlt(Sys.time())),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2024-06-19T11:40:02.714598894+00:00"
>        
> format(nanotime(Sys.Date()),
+        lcltzstr="America/Chicago", tgttzstr="America/Chicago")
[1] "2024-06-19T00:00:00+00:00"
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.93    0.12    1.04