Timezone is ignored when writing pins as a "parquet"

[atsyplenkov]

Due to an upstream bug in nanoparquet (see r-lib/nanoparquet#140), the timezone argument of a POSIXct data type is ignored when using type = parquet in pins::write_pin. See a reprex below:

library(dplyr)
library(lubridate)
library(pins)

set.seed(123)
df <-
  storms |>
  dplyr::slice_sample(n = 1000) |>
  dplyr::mutate(
    name,
    datetime = lubridate::make_datetime(year,month,day,hour,tz = "UTC"),
    datetime_tz = lubridate::with_tz(datetime, "America/New_York"),
    .keep = "none"
  )

# Compare timezones
waldo::compare(
  lubridate::tz(df$datetime),
  lubridate::tz(df$datetime_tz)
)
#> `old`: "UTC"             
#> `new`: "America/New_York"

# Save as a parquet pin
board <- pins::board_temp()
pins::pin_write(board, df, name = "test", type = "parquet")
#> Creating new version '20250619T004531Z-fb1d7'
#> Writing to pin 'test'

df_read <- pins::pin_read(board, "test")

# Should be "America/New_York"
lubridate::tz(df_read$datetime_tz)
#> [1] "UTC"

# Compare timezones
waldo::compare(
  lubridate::tz(df_read$datetime),
  lubridate::tz(df_read$datetime_tz)
)
#> ✔ No differences

^{Created on 2025-06-19 with reprex v2.1.1}

I am using nanoparquet_0.4.2 and pins_1.4.1

[juliasilge]

The pins package uses nanoparquet to both read and write for type = "parquet", so we would expect to lean on nanoparquet for improvement in this area.