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Fixing typos in datetimes.Rmd (#305) 

Phenomena is plural which I think is appropriate in this case.
Remove extra space in 'form  "\<continent\>/\<city\>"'.
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Brett Klamer 2016-08-25 15:32:28 -04:00 committed by Hadley Wickham
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datetimes.Rmd
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@ -10,7 +10,7 @@ This chapter will show you how to work with dates and times in R. At first glanc
I'm sure you know that not every year has 365 days, but do you know the full rule for determining if a year is a leap year? (It has three parts.) You might have remembered that many parts of the world use daylight savings time (DST), so that some days have 23 hours, and others have 25. You might not have known that some minutes have 61 seconds because every now and then leap seconds are added because the Earth's rotation is gradually slowing down.
Dates and times are hard because they have to reconcile two physical phenomenon (the rotation of the Earth and its orbit around the sun) with a whole raft of geopolitical phenomenon including months, time zones, and DST. This chapter won't teach you every last detail about dates and times, but it will give you a solid grounding of practical skills that will help you with common data analysis challenges.
Dates and times are hard because they have to reconcile two physical phenomena (the rotation of the Earth and its orbit around the sun) with a whole raft of geopolitical phenomena including months, time zones, and DST. This chapter won't teach you every last detail about dates and times, but it will give you a solid grounding of practical skills that will help you with common data analysis challenges.
### Prerequisites
@ -329,7 +329,7 @@ Setting larger components of a date to a constant is a powerful technique that a
## Time spans
Next you'll learn about how arithmetic with dates works, including substraction, addition, and division. Along the way, you'll learn about three important classes that represent time spans:
Next you'll learn about how arithmetic with dates works, including subtraction, addition, and division. Along the way, you'll learn about three important classes that represent time spans:
* __durations__, which represent an exact number of seconds.
* __periods__, which represent human units like weeks and months.