dates/calendar_days.rb

tests/_examples/dates/calendar_days.rb in the metorex repository.

# A Date holds the Julian Day Number a calendar day stands for, together with
# the day the Gregorian calendar takes over from the Julian one.
require 'date'

landing = Date.civil(2008, 1, 16)

p landing.jd
p landing.year
p landing.month
p landing.day
p landing.yday
p landing.wday
p landing.cwyear
p landing.cweek
p landing.cwday
p landing.mjd
p landing.ajd
p landing.leap?
p landing.wednesday?
p landing.to_s
p landing.inspect

p Date.jd(2454482) == landing
p Date.ordinal(2008, 16) == landing
p Date.commercial(2008, 3, 3) == landing
p Date.parse("2008-01-16") == landing
p Date.strptime("16/01/2008", "%d/%m/%Y") == landing
p Date.iso8601("20080116") == landing

p (landing + 30).to_s
p (landing - 30).to_s
p (landing >> 2).to_s
p (landing << 1).to_s
p landing.next_day.to_s
p landing.next_month.to_s
p landing.next_year.to_s
p (Date.civil(2008, 3, 1) - Date.civil(2008, 2, 1))

p Date.leap?(2008)
p Date.valid_civil?(2008, 2, 29)
p Date.valid_civil?(2007, 2, 29)
p Date.valid_ordinal?(2008, 366)
p Date.valid_commercial?(2008, 52, 7)

p landing.strftime("%A, %B %-d, %Y")
p landing.strftime("%a %b %e %Y")
p landing.strftime("%j %U %W %V")
p landing.strftime("%^10b")

# The reform of 1582 removed ten days from the Italian calendar, so the days
# either side of the gap sit next to each other.
reform = Date.civil(1582, 10, 4)
p reform.to_s
p (reform + 1).to_s
p reform.julian?
p (reform + 1).gregorian?
p Date.civil(1582, 10, 4, Date::ENGLAND).julian?

walked = []
Date.civil(2008, 1, 16).upto(Date.civil(2008, 1, 19)) { |day| walked.push(day.day) }
p walked
p Date.civil(2008, 1, 16).step(Date.civil(2008, 1, 22), 2).map { |day| day.day }

Output:

2454482
2008
1
16
16
3
2008
3
3
54481
(4908963/2)
true
true
"2008-01-16"
"#<Date: 2008-01-16 ((2454482j),(0/1),(2299161j))>"
true
true
true
true
true
true
"2008-02-15"
"2007-12-17"
"2008-03-16"
"2007-12-16"
"2008-01-17"
"2008-02-16"
"2009-01-16"
29
true
true
false
true
true
"Wednesday, January 16, 2008"
"Wed Jan 16 2008"
"016 02 02 03"
"       JAN"
"1582-10-04"
"1582-10-15"
true
true
true
[16, 17, 18, 19]
[16, 18, 20, 22]