Fix/datetimes (#1462)

* a typo

* redundant condition

datetimes.qmd

@@ -35,7 +35,7 @@ We'll conclude with a brief discussion of the additional challenges posed by tim
 ### Prerequisites
 
 This chapter will focus on the **lubridate** package, which makes it easier to work with dates and times in R.
-As of the latest tidyverse release, lubridate is part of core tidyverse so.
+As of the latest tidyverse release, lubridate is part of core tidyverse.
 We will also need nycflights13 for practice data.
 
 ```{r}
@@ -648,7 +648,7 @@ Now all of our flights obey the laws of physics.
 
 ```{r}
 flights_dt |> 
-  filter(overnight, arr_time < dep_time) 
+  filter(arr_time < dep_time) 
 ```
 
 ### Intervals {#sec-intervals}