Module:ChangePerDay

Documentation for this module may be created at Module:ChangePerDay/doc

-- <nowiki>
--
-- Implements {{ChangePerDay}}
--

local p = {}
local round = require( 'Module:Number' )._round

function p._change( args )
    local lang = mw.language.getContentLanguage()

    local price = tonumber( args[1] ) or 1
    local last = tonumber( args[2] ) or 1
    local date = args[3] or 'January 1'
    local lastDate = args[4] or 'July 1'

    local diff = lang:formatDate( 'U', date ) - lang:formatDate( 'U', lastDate )
    local ret

    diff = diff / 86400 -- diff / no. secs in a day

    if diff < 1 then
        ret = price / last - 1
    else
        ret = ( price / last - 1 ) / math.ceil( diff )
    end

    return round( ret, 3 )

end

return p