R Under development (unstable) (2026-03-07 r89568 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
2026-03-08 101.3710 101.30487
2026-03-09 100.8063 103.59152
2026-03-10 101.1694 102.20265
2026-03-11 101.8023 101.92387
2026-03-12 102.2065 101.79054
2026-03-13 102.1004 102.42649
2026-03-14 103.6119 102.14224
2026-03-15 103.5173  99.48579
2026-03-16 105.5357  97.04532
2026-03-17 105.4730  98.36543
> 
> now <- Sys.time()
> z <- zoo(mat, now + 0:9)
> z
                           x         y
2026-03-08 17:37:51 101.3710 101.30487
2026-03-08 17:37:52 100.8063 103.59152
2026-03-08 17:37:53 101.1694 102.20265
2026-03-08 17:37:54 101.8023 101.92387
2026-03-08 17:37:55 102.2065 101.79054
2026-03-08 17:37:56 102.1004 102.42649
2026-03-08 17:37:57 103.6119 102.14224
2026-03-08 17:37:58 103.5173  99.48579
2026-03-08 17:37:59 105.5357  97.04532
2026-03-08 17:38:00 105.4730  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
2026-03-08T16:37:51.125451088+00:00 101.3710 101.30487
2026-03-08T16:37:51.125451099+00:00 100.8063 103.59152
2026-03-08T16:37:51.125451110+00:00 101.1694 102.20265
2026-03-08T16:37:51.125451121+00:00 101.8023 101.92387
2026-03-08T16:37:51.125451132+00:00 102.2065 101.79054
2026-03-08T16:37:51.125451143+00:00 102.1004 102.42649
2026-03-08T16:37:51.125451154+00:00 103.6119 102.14224
2026-03-08T16:37:51.125451165+00:00 103.5173  99.48579
2026-03-08T16:37:51.125451176+00:00 105.5357  97.04532
2026-03-08T16:37:51.125451187+00:00 105.4730  98.36543
> 
> 
> proc.time()
   user  system elapsed 
   0.56    0.10    0.65