38 lines
1.1 KiB
Text
38 lines
1.1 KiB
Text
import "./date" for Date
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var days = ["Sunday", "Monday", "Tuesday", "Wednesday","Thursday", "Friday", "Saturday"]
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var anchorDay = Fn.new { |y| (2 + 5 * (y%4) + 4 *(y%100) + 6 * (y%400)) % 7 }
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var isLeapYear = Fn.new { |y| y%4 == 0 && (y%100 != 0 || y%400 == 0) }
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var firstDaysCommon = [3, 7, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5]
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var firstDaysLeap = [4, 1, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5]
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var dates = [
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"1800-01-06",
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"1875-03-29",
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"1915-12-07",
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"1970-12-23",
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"2043-05-14",
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"2077-02-12",
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"2101-04-02"
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]
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System.print("Days of week given by Doomsday rule:")
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for (date in dates) {
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var y = Num.fromString(date[0..3])
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var m = Num.fromString(date[5..6]) - 1
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var d = Num.fromString(date[8..9])
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var a = anchorDay.call(y)
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var w = d - (isLeapYear.call(y) ? firstDaysLeap[m] : firstDaysCommon[m])
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if (w < 0) w = 7 + w
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var dow = (a + w) % 7
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System.print("%(date) -> %(days[dow])")
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}
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System.print("\nDays of week given by Date module:")
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for (date in dates) {
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var d = Date.parse(date, Date.isoDate)
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System.print("%(date) -> %(d.weekDay)")
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}
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