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More caveats about durations 

Fixes #957
This commit is contained in:
Hadley Wickham 2022-08-09 15:51:15 -05:00
parent 5162de55ea
commit 4c3f5aa604
1 changed files with 4 additions and 1 deletions
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datetimes.qmd
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@ -409,7 +409,10 @@ dyears(1)
``` ```
Durations always record the time span in seconds. Durations always record the time span in seconds.
Larger units are created by converting minutes, hours, days, weeks, and years to seconds at the standard rate (60 seconds in a minute, 60 minutes in an hour, 24 hours in day, 7 days in a week, 365 days in a year). Larger units are created by converting minutes, hours, days, weeks, and years to seconds: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 7 days in a week.
Larger time units are more problematic.
A year is uses the "average" number of days in a year, i.e. 365.25.
There's no way to convert a month to a duration, because there's just too much variation.
You can add and multiply durations: You can add and multiply durations: