R Under development (unstable) (2025-01-09 r87552 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
2025-01-11 101.3710 101.30487
2025-01-12 100.8063 103.59152
2025-01-13 101.1694 102.20265
2025-01-14 101.8023 101.92387
2025-01-15 102.2065 101.79054
2025-01-16 102.1004 102.42649
2025-01-17 103.6119 102.14224
2025-01-18 103.5173  99.48579
2025-01-19 105.5357  97.04532
2025-01-20 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2025-01-11 00:22:00 101.3710 101.30487
2025-01-11 00:22:01 100.8063 103.59152
2025-01-11 00:22:02 101.1694 102.20265
2025-01-11 00:22:03 101.8023 101.92387
2025-01-11 00:22:04 102.2065 101.79054
2025-01-11 00:22:05 102.1004 102.42649
2025-01-11 00:22:06 103.6119 102.14224
2025-01-11 00:22:07 103.5173  99.48579
2025-01-11 00:22:08 105.5357  97.04532
2025-01-11 00:22:09 105.4730  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
2025-01-10T23:22:00.163132906+00:00 101.3710 101.30487
2025-01-10T23:22:00.163132917+00:00 100.8063 103.59152
2025-01-10T23:22:00.163132928+00:00 101.1694 102.20265
2025-01-10T23:22:00.163132939+00:00 101.8023 101.92387
2025-01-10T23:22:00.163132950+00:00 102.2065 101.79054
2025-01-10T23:22:00.163132961+00:00 102.1004 102.42649
2025-01-10T23:22:00.163132972+00:00 103.6119 102.14224
2025-01-10T23:22:00.163132983+00:00 103.5173  99.48579
2025-01-10T23:22:00.163132994+00:00 105.5357  97.04532
2025-01-10T23:22:00.163133005+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   0.65    0.04    0.70