R Under development (unstable) (2024-05-24 r86611 ucrt) -- "Unsuffered Consequences"
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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 2024-05-25T14:02:28.483095943+00:00 2024-05-25T14:02:28.480168174+00:00
2 2024-05-25T14:02:28.483095961+00:00 2024-05-25T14:02:28.480168244+00:00
3 2024-05-25T14:02:28.483096004+00:00 2024-05-25T14:02:28.480168274+00:00
4 2024-05-25T14:02:28.483096076+00:00 2024-05-25T14:02:28.480168334+00:00
5 2024-05-25T14:02:28.483096165+00:00 2024-05-25T14:02:28.480168384+00:00
6 2024-05-25T14:02:28.483096199+00:00 2024-05-25T14:02:28.480168424+00:00
> 
> proc.time()
   user  system elapsed 
   1.18    0.09    1.28