R Under development (unstable) (2024-06-20 r86796 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
2024-06-21 101.3710 101.30487
2024-06-22 100.8063 103.59152
2024-06-23 101.1694 102.20265
2024-06-24 101.8023 101.92387
2024-06-25 102.2065 101.79054
2024-06-26 102.1004 102.42649
2024-06-27 103.6119 102.14224
2024-06-28 103.5173  99.48579
2024-06-29 105.5357  97.04532
2024-06-30 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2024-06-21 16:46:57 101.3710 101.30487
2024-06-21 16:46:58 100.8063 103.59152
2024-06-21 16:46:59 101.1694 102.20265
2024-06-21 16:47:00 101.8023 101.92387
2024-06-21 16:47:01 102.2065 101.79054
2024-06-21 16:47:02 102.1004 102.42649
2024-06-21 16:47:03 103.6119 102.14224
2024-06-21 16:47:04 103.5173  99.48579
2024-06-21 16:47:05 105.5357  97.04532
2024-06-21 16:47:06 105.4730  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
2024-06-21T14:46:57.799540043+00:00 101.3710 101.30487
2024-06-21T14:46:57.799540054+00:00 100.8063 103.59152
2024-06-21T14:46:57.799540065+00:00 101.1694 102.20265
2024-06-21T14:46:57.799540076+00:00 101.8023 101.92387
2024-06-21T14:46:57.799540087+00:00 102.2065 101.79054
2024-06-21T14:46:57.799540098+00:00 102.1004 102.42649
2024-06-21T14:46:57.799540109+00:00 103.6119 102.14224
2024-06-21T14:46:57.799540120+00:00 103.5173  99.48579
2024-06-21T14:46:57.799540131+00:00 105.5357  97.04532
2024-06-21T14:46:57.799540142+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   0.57    0.09    0.65