Module:DayCalc

Documentation for DayCalc

DayCalc may evolve into many day/date functions. Right now, it has a case of the Tuesdays.

Examples:

get_next_tuesday

1. Returns the next Tuesday if today is not Tuesday, otherwise returns today's date.
   • wikitext: {{#invoke:DayCalc|get_next_tuesday}}
   • result: October 03, 2023
2. Returns the next Tuesday if today is not Tuesday, otherwise returns today's date (ISO format)
   • wikitext: {{#invoke:DayCalc|get_next_tuesday|isodate=true}}
   • result: 2023-10-03

get_first_coming_tuesday_of_month

1. Returns the first upcoming Tuesday which is the first Tuesday of a month.
   • wikitext: {{#invoke:DayCalc|get_first_coming_tuesday_of_month}}
   • result: October 3, 2023
2. Returns the first upcoming Tuesday which is the first Tuesday of a month (ISO format)
   • wikitext: {{#invoke:DayCalc|get_first_coming_tuesday_of_month|isodate=true}}
   • result: 2023-10-03

---

-- Module:NextTuesday.lua

local p = {}

function p.get_next_tuesday(frame)
    local isodate = frame.args.isodate
    local current_time = os.time()
    local current_day_of_week = tonumber(os.date("%w", current_time))
    local days_until_tuesday = (9 - current_day_of_week) % 7
    
    local next_tuesday_time = current_time + days_until_tuesday * 86400 -- 86400 seconds in a day
    
    if current_day_of_week == 2 then
        if isodate == "true" then
            return os.date("%Y-%m-%d", current_time)
        else
            return os.date("%B %d, %Y", current_time)
        end
    else
        if isodate == "true" then
            return os.date("%Y-%m-%d", next_tuesday_time)
        else
            return os.date("%B %d, %Y", next_tuesday_time)
        end
    end
end


function p.get_first_coming_tuesday_of_month(frame)
    local isodate = frame.args.isodate
    local current_year = tonumber(os.date("%Y"))
    local current_month = tonumber(os.date("%m"))
    local current_datenum = tonumber(os.date("%e"))
    local day_of_week = tonumber(os.date("%w"))

    local first_tuesday_day

    if current_datenum > 7 then
        current_month = current_month + 1
        if current_month > 12 then
            current_month = 1
            current_year = current_year + 1
        end
    elseif current_datenum <= 7 and day_of_week == 2 then
        if isodate == "true" then
            return os.date("%Y-%m-%d")
        else
            return os.date("%B %e, %Y")
        end
    end

    for day = 1, 7 do
        local day_time = os.time({ year = current_year, month = current_month, day = day, hour = 0, min = 0, sec = 0 })
        local day_of_week = tonumber(os.date("%w", day_time))
        if day_of_week == 2 then -- Tuesday
            first_tuesday_day = day
            break
        end
    end

    if first_tuesday_day then
        local first_tuesday_time = os.time({ year = current_year, month = current_month, day = first_tuesday_day, hour = 0, min = 0, sec = 0 })

        if isodate == "true" then
            return os.date("%Y-%m-%d", first_tuesday_time)
        else
            return os.date("%B %e, %Y", first_tuesday_time)
        end
    else
        return "Unable to calculate first Tuesday of the month."
    end
end

return p