R version 4.5.0 RC (2025-04-04 r88118 ucrt) -- "How About a Twenty-Six"
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> ## packages
> library("zoo")

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

> library("timeDate")
> 
> ## aggregate() with "timeDate" index
> z <- zoo(1:3, timeDate(c("2011-09-19 12:00", "2011-09-19 12:00", "2011-09-19 13:00")))
Warning message:
In zoo(1:3, timeDate(c("2011-09-19 12:00", "2011-09-19 12:00", "2011-09-19 13:00"))) :
  some methods for "zoo" objects do not work if the index entries in 'order.by' are not unique
> aggregate(z, identity, mean)
2011-09-19 12:00:00 2011-09-19 13:00:00 
                1.5                 3.0 
> 
> ## assignment and preservation of column names in merge()
> x <- zoo(cbind(a = 3:4, b = 5:6))
> y <- zoo(1:2)
> merge(x, zoo(, time(x)))
  a b
1 3 5
2 4 6
> merge(y, x)
  y a b
1 1 3 5
2 2 4 6
> 
> ## [<-.zoo with logical row index
> z <- zoo(cbind(1:5, 11:15), 101:105)
> z[index(z) == 103, 1] <- 0
> 
> ## rollapply(..., mean, partial = TRUE)
> z <- zoo(11:15)
> identical(rollapply(z, 3, mean, partial = TRUE),
+   rollapply(z, 3, (mean), partial = TRUE))
[1] TRUE
> 
> ## rollmedian(..., k = 1)
> z <- zoo(sin(0:20))
> identical(z, rollmedian(z, 1))
[1] TRUE
> identical(coredata(rollmedian(z, 1)), as.vector(runmed(coredata(z), 1)))
[1] TRUE
> 
> ## na.fill with just NAs (directly and implicitly through rollapply)
> na.fill(c(NA, NA), fill = NA)
[1] NA NA
> rollapply(1:2, 3, sum, fill = NA)
[1] NA NA
> 
> proc.time()
   user  system elapsed 
   0.29    0.03    0.31