R Under development (unstable) (2024-09-15 r87152 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
2024-09-16 101.3710 101.30487
2024-09-17 100.8063 103.59152
2024-09-18 101.1694 102.20265
2024-09-19 101.8023 101.92387
2024-09-20 102.2065 101.79054
2024-09-21 102.1004 102.42649
2024-09-22 103.6119 102.14224
2024-09-23 103.5173  99.48579
2024-09-24 105.5357  97.04532
2024-09-25 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2024-09-16 14:40:58 101.3710 101.30487
2024-09-16 14:40:59 100.8063 103.59152
2024-09-16 14:41:00 101.1694 102.20265
2024-09-16 14:41:01 101.8023 101.92387
2024-09-16 14:41:02 102.2065 101.79054
2024-09-16 14:41:03 102.1004 102.42649
2024-09-16 14:41:04 103.6119 102.14224
2024-09-16 14:41:05 103.5173  99.48579
2024-09-16 14:41:06 105.5357  97.04532
2024-09-16 14:41:07 105.4730  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
2024-09-16T12:40:58.767307043+00:00 101.3710 101.30487
2024-09-16T12:40:58.767307054+00:00 100.8063 103.59152
2024-09-16T12:40:58.767307065+00:00 101.1694 102.20265
2024-09-16T12:40:58.767307076+00:00 101.8023 101.92387
2024-09-16T12:40:58.767307087+00:00 102.2065 101.79054
2024-09-16T12:40:58.767307098+00:00 102.1004 102.42649
2024-09-16T12:40:58.767307109+00:00 103.6119 102.14224
2024-09-16T12:40:58.767307120+00:00 103.5173  99.48579
2024-09-16T12:40:58.767307131+00:00 105.5357  97.04532
2024-09-16T12:40:58.767307142+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   0.57    0.04    0.61