Mengatur zona waktu

Jika Anda mengimpor sebuah datetime dan zona waktunya salah, Anda dapat mengaturnya dengan force_tz(). Berikan datetime sebagai argumen pertama dan zona waktu yang sesuai ke argumen tzone. Ingat, zona waktu harus berasal dari OlsonNames().

Saya ingin menonton Selandia Baru di pertandingan Piala Dunia Sepak Bola Wanita tahun 2015, tetapi waktu yang tercantum di situs FIFA semuanya menggunakan waktu lokal lokasi pertandingan. Dalam latihan ini Anda akan membantu saya mengatur zona waktunya, lalu pada latihan berikutnya Anda akan membantu saya menentukan jam berapa saya perlu menyalakan siaran untuk menontonnya.

Latihan ini adalah bagian dari kursus

Bekerja dengan Tanggal dan Waktu di R

Petunjuk latihan

Saya telah menuliskan waktu sesuai yang tercantum di situs FIFA untuk laga 2 dan 3 babak grup Selandia Baru dalam kode Anda.

Laga 2 dimainkan di Edmonton. Gunakan force_tz() untuk mengatur zona waktu laga 2 menjadi "America/Edmonton".
Laga 3 dimainkan di Winnipeg. Gunakan force_tz() untuk mengatur zona waktu laga 3 menjadi "America/Winnipeg".
Cari tahu berapa lama tim memiliki waktu istirahat di antara kedua laga tersebut, dengan menggunakan as.period() pada interval antara game2_local dan game3_local.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Game2: CAN vs NZL in Edmonton
game2 <- mdy_hm("June 11 2015 19:00")

# Game3: CHN vs NZL in Winnipeg
game3 <- mdy_hm("June 15 2015 18:30")

# Set the timezone to "America/Edmonton"
game2_local <- ___(game2, tzone = ___)
game2_local

# Set the timezone to "America/Winnipeg"
game3_local <- ___(game3, tzone = ___)
game3_local

# How long does the team have to rest?
as.period(___)

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Bekerja dengan Tanggal dan Waktu di R

SkillTag.level.intermediateSkillTag.label

4.8+

Mulai Kursus Gratis

R doesn't know something is a date or time unless you tell it. In this chapter you'll learn about some of the ways R stores dates and times by exploring how often R versions are released, and how quickly people download them. You'll also get a sneak peek at what you'll learn in the following chapters.

Exercise 1: Introduction to dates Exercise 2: Recognizing ISO 8601 dates Exercise 3: Specifying dates Exercise 4: Automatic import Exercise 5: Why use dates?Exercise 6: Plotting Exercise 7: Arithmetic and logical operators Exercise 8: What about times?Exercise 9: Getting datetimes into R Exercise 10: Datetimes behave nicely too Exercise 11: Why lubridate?

Dates and times come in a huge assortment of formats, so your first hurdle is often to parse the format you have into an R datetime. This chapter teaches you to import dates and times with the lubridate package. You'll also learn how to extract parts of a datetime. You'll practice by exploring the weather in R's birthplace, Auckland NZ.

Exercise 1: Parsing dates with lubridate Exercise 2: Selecting the right parsing function Exercise 3: Specifying an order with `parse_date_time()`Exercise 4: Weather in Auckland Exercise 5: Import daily weather data Exercise 6: Import hourly weather data Exercise 7: Extracting parts of a datetime Exercise 8: What can you extract?Exercise 9: Adding useful labels Exercise 10: Extracting for plotting Exercise 11: Extracting for filtering and summarizing Exercise 12: Rounding datetimes Exercise 13: Practice rounding Exercise 14: Rounding with the weather data

Getting datetimes into R is just the first step. Now that you know how to parse datetimes, you need to learn how to do calculations with them. In this chapter, you'll learn the different ways of representing spans of time with lubridate and how to leverage them to do arithmetic on datetimes. By the end of the chapter, you'll have calculated how long it's been since the first man stepped on the moon, generated sequences of dates to help schedule reminders, calculated when an eclipse occurs, and explored the reigns of monarch's of England (and which ones might have seen Halley's comet!).

Exercise 1: Taking differences of datetimes Exercise 2: How long has it been?Exercise 3: How many seconds are in a day?Exercise 4: Time spans.Exercise 5: Adding or subtracting a time span to a datetime Exercise 6: Duration or Period?Exercise 7: Arithmetic with timespans Exercise 8: Generating sequences of datetimes Exercise 9: The tricky thing about months Exercise 10: Intervals Exercise 11: Examining intervals. Reigns of kings and queens Exercise 12: Comparing intervals and datetimes Exercise 13: Converting to durations and periods

You now know most of what you need to tackle data that includes dates and times, but there are a few other problems you might encounter in practice. In this final chapter you'll learn a little more about these problems by returning to some of the earlier data examples and learning how to handle time zones, deal with times when you don't care about dates, parse dates quickly, and output dates and times.

Exercise 1: Zona waktu Exercise 2: Mengatur zona waktu

Latihan Saat Ini

Exercise 3: Melihat dalam suatu zona waktu Exercise 4: Zona waktu dalam data cuaca Exercise 5: Waktu tanpa tanggal Exercise 6: Lebih lanjut tentang mengimpor dan mengekspor tanggal-waktu Exercise 7: Parsing cepat dengan fasttime Exercise 8: Parsing cepat dengan lubridate::fast_strptime Exercise 9: Menghasilkan keluaran tanggal dan waktu yang rapi Exercise 10: Ringkasan