R Under development (unstable) (2024-06-18 r86781 ucrt) -- "Unsuffered Consequences"
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> 
> library(nanotime)
> suppressMessages(library(zoo))          
> 
> set.seed(42)
> x <- 100 + cumsum(rnorm(10))
> y <- 100 + cumsum(rnorm(10))
> mat <- cbind(x, y)
> 
> now <- Sys.Date()
> z <- zoo(mat, now + 0:9)
> z
                  x         y
2024-06-19 101.3710 101.30487
2024-06-20 100.8063 103.59152
2024-06-21 101.1694 102.20265
2024-06-22 101.8023 101.92387
2024-06-23 102.2065 101.79054
2024-06-24 102.1004 102.42649
2024-06-25 103.6119 102.14224
2024-06-26 103.5173  99.48579
2024-06-27 105.5357  97.04532
2024-06-28 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2024-06-19 13:40:11 101.3710 101.30487
2024-06-19 13:40:12 100.8063 103.59152
2024-06-19 13:40:13 101.1694 102.20265
2024-06-19 13:40:14 101.8023 101.92387
2024-06-19 13:40:15 102.2065 101.79054
2024-06-19 13:40:16 102.1004 102.42649
2024-06-19 13:40:17 103.6119 102.14224
2024-06-19 13:40:18 103.5173  99.48579
2024-06-19 13:40:19 105.5357  97.04532
2024-06-19 13:40:20 105.4730  98.36543
> 
> now <- nanotime(Sys.time())                  
> z <- zoo(mat, now + 11*(0:9))           # inc. by 11 to more visible, 1 works too
> z
                                           x         y
2024-06-19T11:40:11.258248091+00:00 101.3710 101.30487
2024-06-19T11:40:11.258248102+00:00 100.8063 103.59152
2024-06-19T11:40:11.258248113+00:00 101.1694 102.20265
2024-06-19T11:40:11.258248124+00:00 101.8023 101.92387
2024-06-19T11:40:11.258248135+00:00 102.2065 101.79054
2024-06-19T11:40:11.258248146+00:00 102.1004 102.42649
2024-06-19T11:40:11.258248157+00:00 103.6119 102.14224
2024-06-19T11:40:11.258248168+00:00 103.5173  99.48579
2024-06-19T11:40:11.258248179+00:00 105.5357  97.04532
2024-06-19T11:40:11.258248190+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   1.07    0.20    1.73