Difference between revisions of "Module:Calendar date/recurring"
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blackwiki>Howcheng |
blackwiki>Howcheng |
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| Line 25: | Line 25: | ||
-- find the first [dayofweek] of this month | -- find the first [dayofweek] of this month | ||
local dayofweek = tonumber(args.dayofweek) | local dayofweek = tonumber(args.dayofweek) | ||
| − | while | + | while dateparts["wday"] ~= dayofweek do |
date = date + ONE_DAY | date = date + ONE_DAY | ||
dateparts = os.date("*t", date) | dateparts = os.date("*t", date) | ||
end | end | ||
| − | |||
-- add the correct number of weeks | -- add the correct number of weeks | ||
| − | + | local weeknumber = tonumber(args.weeknumber) | |
| − | + | if weeknumber > 1 then | |
| − | + | date = date + ((weeknumber - 1) * (7 * ONE_DAY)) | |
| − | + | end | |
| − | + | local result = os.date("%Y-%m-%d", date) | |
| − | + | return result | |
end | end | ||
return p | return p | ||
Revision as of 00:10, 27 March 2019
Documentation for this module may be created at Module:Calendar date/recurring/doc
--[[
Calculates the Gregorian date of a recurring holiday that varies year-to-year, but follows the rule "Nth [day of week] of [month]"
"month" = month number (1 to 12)
"weeknumber" = number of week (1 to 4, or -1 to mean "last")
"dayofweek" = number that represents the day of the week, where 1 = Sunday and 7 = Saturday
"year" = Gregorian calendar year
]]
require('Module:No globals')
local p = {}
function p.calculate(frame)
local args = frame.args
local ONE_DAY = 86400 -- number of seconds in one day
local year = tonumber(args.year)
local month = tonumber(args.month)
local date = os.time{year=year, month=month, day=1}
local dateparts = os.date("*t", date)
-- find the first [dayofweek] of this month
local dayofweek = tonumber(args.dayofweek)
while dateparts["wday"] ~= dayofweek do
date = date + ONE_DAY
dateparts = os.date("*t", date)
end
-- add the correct number of weeks
local weeknumber = tonumber(args.weeknumber)
if weeknumber > 1 then
date = date + ((weeknumber - 1) * (7 * ONE_DAY))
end
local result = os.date("%Y-%m-%d", date)
return result
end
return p