R Under development (unstable) (2024-05-24 r86611 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
2024-05-25 101.3710 101.30487
2024-05-26 100.8063 103.59152
2024-05-27 101.1694 102.20265
2024-05-28 101.8023 101.92387
2024-05-29 102.2065 101.79054
2024-05-30 102.1004 102.42649
2024-05-31 103.6119 102.14224
2024-06-01 103.5173  99.48579
2024-06-02 105.5357  97.04532
2024-06-03 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2024-05-25 16:02:34 101.3710 101.30487
2024-05-25 16:02:35 100.8063 103.59152
2024-05-25 16:02:36 101.1694 102.20265
2024-05-25 16:02:37 101.8023 101.92387
2024-05-25 16:02:38 102.2065 101.79054
2024-05-25 16:02:39 102.1004 102.42649
2024-05-25 16:02:40 103.6119 102.14224
2024-05-25 16:02:41 103.5173  99.48579
2024-05-25 16:02:42 105.5357  97.04532
2024-05-25 16:02:43 105.4730  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
2024-05-25T14:02:34.198266029+00:00 101.3710 101.30487
2024-05-25T14:02:34.198266040+00:00 100.8063 103.59152
2024-05-25T14:02:34.198266051+00:00 101.1694 102.20265
2024-05-25T14:02:34.198266062+00:00 101.8023 101.92387
2024-05-25T14:02:34.198266073+00:00 102.2065 101.79054
2024-05-25T14:02:34.198266084+00:00 102.1004 102.42649
2024-05-25T14:02:34.198266095+00:00 103.6119 102.14224
2024-05-25T14:02:34.198266106+00:00 103.5173  99.48579
2024-05-25T14:02:34.198266117+00:00 105.5357  97.04532
2024-05-25T14:02:34.198266128+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   0.87    0.06    0.92