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local M = {}
local floor = math.floor
M.MON = 1
M.TUE = 2
M.WED = 3
M.THU = 4
M.FRI = 5
M.SAT = 6
M.SUN = 7
function M.calc_week_of_day(y, m, d)
-- Zeller's congruence
if m == 1 or m == 2 then
m = m + 12
y = y - 1
end
local C = floor(y / 100)
local Y = y % 100
local G = 5*C + floor(C/4)
return 1 + (d + floor(26 * (m+1) / 10) + Y + floor(Y/4) + G + 5) % 7
end
function M.translate_week_of_day(w, locale)
-- assert(locale == 'ja_JP')
return ({
[M.MON] = '月',
[M.TUE] = '火',
[M.WED] = '水',
[M.THU] = '木',
[M.FRI] = '金',
[M.SAT] = '土',
[M.SUN] = '日',
})[w]
end
return M
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