[dbplyr translation] as.POSIXct doesn't respect timezone.

[cy-james-lee]

It seems timezone differences are dealt correctly if datetime vectors are used directly (converts to UTC first), but if as.POSIXct is used interactively, timezone is ignored.

library(duckdb, quietly = TRUE)
library(dplyr, quietly = TRUE, warn.conflicts = FALSE)

conn1 <- dbConnect(duckdb(), ":memory:")
tbl1 <-
  tbl(
    conn1,
    sql("SELECT now() AS now")
  ) |> 
  mutate(
    now_txt = as.character(now),
    compare1 = now > as.POSIXct("2025-03-01 18:00:00"), # ignores tz
    compare2 = now > !!as.POSIXct("2025-03-01 18:00:00") # respects tz
  )

tbl1
#> # Source:   SQL [?? x 4]
#> # Database: DuckDB v1.2.0 [root@Darwin 24.3.0:R 4.4.2/:memory:]
#>   now                 now_txt                    compare1 compare2
#>   <dttm>              <chr>                      <lgl>    <lgl>   
#> 1 2025-03-01 22:13:17 2025-03-01 22:13:17.795+00 TRUE     FALSE

tbl1 |>  
   show_query()
#> <SQL>
#> SELECT
#>   q01.*,
#>   CAST(now AS TEXT) AS now_txt,
#>   now > CAST('2025-03-01 18:00:00' AS TIMESTAMP) AS compare1,
#>   now > '2025-03-01 23:00:00'::timestamp AS compare2
#> FROM (SELECT now() AS now) q01

^{Created on 2025-03-01 with reprex v2.1.1}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
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#>  os       macOS Sequoia 15.3.1
#>  system   aarch64, darwin20
#>  ui       X11
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       America/Indiana/Indianapolis
#>  date     2025-03-01
#>  pandoc   3.2 @ /Applications/RStudio.app/Contents/Resources/app/quarto/bin/tools/aarch64/ (via rmarkdown)
#>  quarto   1.6.42 @ /usr/local/bin/quarto
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