我下载了这个文件，得到了22,646个观测值的时间维度。
使用CFtime package，您可以轻松处理气候观测文件中的时间维度，如下所示：

library(CFtime)

nc <- nc_open("./tasmin_hadukgrid_uk_region_day_19600101-20211231.nc")

# Use CFtime to read in the time dimension from the file.
cf <- CFtime(nc$dim$time$units, nc$dim$time$calendar, nc$dim$time$vals)

# Get the dates as a character vector
dates <- CFtimestamp(cf)

# The "geo_region" variable has the names of the administrative units
region <- ncvar_get(nc, "geo_region")

# Read the data, transpose to get regions in columns and dates in rows
tasmin <- t(ncvar_get(nc, "tasmin"))
nc_close(nc)

# Set the dimnames on the array
dimnames(tasmin) <- list(dates, region)

# Convert the array to a data.frame
tasmin <- as.data.frame(tasmin)