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### Prerequisites
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### Prerequisites
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This chapter will focus on the **lubridate** package, which makes it easier to work with dates and times in R.
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This chapter will focus on the **lubridate** package, which makes it easier to work with dates and times in R.
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As of the latest tidyverse release, lubridate is part of core tidyverse so.
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As of the latest tidyverse release, lubridate is part of core tidyverse.
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We will also need nycflights13 for practice data.
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We will also need nycflights13 for practice data.
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```{r}
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```{r}
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```{r}
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```{r}
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flights_dt |>
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flights_dt |>
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filter(overnight, arr_time < dep_time)
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filter(arr_time < dep_time)
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```
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```
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### Intervals {#sec-intervals}
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### Intervals {#sec-intervals}
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