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)
> 
> set.seed(42)
> N <- 300
> shine <- nanotime(Sys.time()) + cumsum(10*rpois(n=N+1, lambda=4))
> rain <- nanotime(Sys.time()) + cumsum(10*rpois(n=N+1, lambda=4) + round(runif(N+1)*25))
> 
> if (requireNamespace("data.table", quietly=TRUE)) {
+     suppressMessages(library(data.table))
+     suppressMessages(library(bit64))
+     raw <- data.table(shine=shine, rain=rain)
+ 
+     df <- data.frame(val=c(rain,shine), key=rep(c("rain", "shine"), each=N+1))
+     head(df)
+ 
+     ## now on differences
+     ddf <- data.frame(val=as.numeric(c(diff(rain),diff(shine))), # need to cast to numeric after diffs
+                       key=rep(c("rain", "shine"), each=N))
+     head(ddf)
+ 
+     ## simpler data.frame, inserts 'formatted'
+     newdf <- data.frame(rain=rain, shine=shine)
+     head(newdf)
+ }
                                 rain                               shine
1 2026-04-22T15:45:45.837184011+00:00 2026-04-22T15:45:45.835043977+00:00
2 2026-04-22T15:45:45.837184029+00:00 2026-04-22T15:45:45.835044047+00:00
3 2026-04-22T15:45:45.837184072+00:00 2026-04-22T15:45:45.835044077+00:00
4 2026-04-22T15:45:45.837184144+00:00 2026-04-22T15:45:45.835044137+00:00
5 2026-04-22T15:45:45.837184233+00:00 2026-04-22T15:45:45.835044187+00:00
6 2026-04-22T15:45:45.837184267+00:00 2026-04-22T15:45:45.835044227+00:00
> 
> proc.time()
   user  system elapsed 
   1.00    0.21    1.14