23.7

• We can also answer Exercise 23.4.4, Item 1. Roughly estimate when gh_repos was created. Why can you only roughly estimate the date?

repos |> unnest_longer(json) |>
  unnest_wider(json) |>
  select(created_at)

## # A tibble: 176 × 1
##    created_at          
##    <chr>               
##  1 2016-06-14T22:33:49Z
##  2 2015-08-10T18:56:23Z
##  3 2015-05-28T14:04:57Z
##  4 2015-05-01T21:29:10Z
##  5 2016-06-21T09:29:01Z
##  6 2015-04-14T02:57:39Z
##  7 2015-06-11T03:10:38Z
##  8 2016-09-11T23:19:49Z
##  9 2016-07-12T11:31:31Z
## 10 2014-09-22T20:07:22Z
## # ℹ 166 more rows

repos |> unnest_longer(json) |>
  unnest_wider(json) |>
  select(created_at) |>
  separate_wider_position(created_at, 
                          widths = c(ymd = 10, 10)) |>
  slice_max(order_by = ymd)

## # A tibble: 1 × 1
##   ymd       
##   <chr>     
## 1 2016-10-24