Module:Age
Documentation for this module may be created at Module:Age/doc
-- Implement various "age of" and other date-related templates.
local _Date, _currentDate
local function getExports(frame)
-- Return objects exported from the date module or its sandbox.
if not _Date then
local sandbox = frame:getTitle():find('sandbox', 1, true) and '/sandbox' or ''
local datemod = require('Module:Date' .. sandbox)
_Date = datemod._Date
_currentDate = datemod._current
end
return _Date, _currentDate
end
local Collection -- a table to hold items
Collection = {
add = function (self, item)
if item ~= nil then
self.n = self.n + 1
self[self.n] = item
end
end,
join = function (self, sep)
return table.concat(self, sep)
end,
remove = function (self, pos)
if self.n > 0 and (pos == nil or (0 < pos and pos <= self.n)) then
self.n = self.n - 1
return table.remove(self, pos)
end
end,
sort = function (self, comp)
table.sort(self, comp)
end,
new = function ()
return setmetatable({n = 0}, Collection)
end
}
Collection.__index = Collection
local function stripToNil(text)
-- If text is a string, return its trimmed content, or nil if empty.
-- Otherwise return text (which may, for example, be nil).
if type(text) == 'string' then
text = text:match('(%S.-)%s*$')
end
return text
end
local function yes(parameter)
-- Return true if parameter should be interpreted as "yes".
-- Do not want to accept mixed upper/lowercase unless done by current templates.
-- Need to accept "on" because "round=on" is wanted.
return ({ y = true, yes = true, on = true })[parameter]
end
local function message(msg, id)
-- Return formatted message text for an error or warning.
local categories = {
error = '[[Category:Age error]]',
warning = '[[Category:Age error]]', -- same as error until determine whether 'Age warning' would be worthwhile
}
local a, b, category
if id == 'warning' then
a = '<sup>[<i>'
b = '</i>]</sup>'
else
a = '<strong class="error">Error: '
b = '</strong>'
end
if mw.title.getCurrentTitle():inNamespaces(0) then
-- Category only in namespaces: 0=article.
category = categories[id or 'error']
end
return
a ..
mw.text.nowiki(msg) ..
b ..
(category or '')
end
local function formatNumber(number)
-- Return the given number formatted with commas as group separators,
-- given that the number is an integer.
local numstr = tostring(number)
local length = #numstr
local places = Collection.new()
local pos = 0
repeat
places:add(pos)
pos = pos + 3
until pos >= length
places:add(length)
local groups = Collection.new()
for i = places.n, 2, -1 do
local p1 = length - places[i] + 1
local p2 = length - places[i - 1]
groups:add(numstr:sub(p1, p2))
end
return groups:join(',')
end
local function spellNumber(number, options, i)
-- Return result of spelling number, or
-- return number (as a string) if cannot spell it.
-- i == 1 for the first number which can optionally start with an uppercase letter.
number = tostring(number)
return require('Module:ConvertNumeric').spell_number(
number,
nil, -- fraction numerator
nil, -- fraction denominator
i == 1 and options.upper, -- true: 'One' instead of 'one'
not options.us, -- true: use 'and' between tens/ones etc
options.adj, -- true: hyphenated
options.ordinal -- true: 'first' instead of 'one'
) or number
end
local function makeExtra(args, flagCurrent)
-- Return extra text that will be inserted before the visible result
-- but after any sort key.
local extra = args.prefix or ''
if mw.ustring.len(extra) > 1 then
-- Parameter "~" gives "~3" whereas "over" gives "over 3".
extra = extra .. ' '
end
if flagCurrent then
extra = '<span class="currentage"></span>' .. extra
end
return extra
end
local function makeSort(value, sortable)
-- Return a sort key if requested.
-- Assume value is a valid number which has not overflowed.
if sortable == 'sortable_table' or sortable == 'sortable_on' or sortable == 'sortable_debug' then
local sortKey
if value == 0 then
sortKey = '5000000000000000000'
else
local mag = math.floor(math.log10(math.abs(value)) + 1e-14)
if value > 0 then
sortKey = 7000 + mag
else
sortKey = 2999 - mag
value = value + 10^(mag+1)
end
sortKey = string.format('%d', sortKey) .. string.format('%015.0f', math.floor(value * 10^(14-mag)))
end
local lhs, rhs
if sortable == 'sortable_table' then
lhs = 'data-sort-value="'
rhs = '"|'
else
lhs = sortable == 'sortable_debug' and
'<span style="border:1px solid;display:inline;" class="sortkey">' or
'<span style="display:none" class="sortkey">'
rhs = '♠</span>'
end
return lhs .. sortKey .. rhs
end
end
local translateParameters = {
abbr = {
off = 'abbr_off',
on = 'abbr_on',
},
disp = {
age = 'disp_age',
raw = 'disp_raw',
},
format = {
raw = 'format_raw',
commas = 'format_commas',
},
round = {
on = 'on',
yes = 'on',
months = 'ym',
weeks = 'ymw',
days = 'ymd',
hours = 'ymdh',
},
sep = {
comma = 'sep_comma',
[','] = 'sep_comma',
serialcomma = 'sep_serialcomma',
space = 'sep_space',
},
show = {
hide = { id = 'hide' },
y = { 'y', id = 'y' },
ym = { 'y', 'm', id = 'ym' },
ymd = { 'y', 'm', 'd', id = 'ymd' },
ymw = { 'y', 'm', 'w', id = 'ymw' },
ymwd = { 'y', 'm', 'w', 'd', id = 'ymwd' },
yd = { 'y', 'd', id = 'yd', keepZero = true },
m = { 'm', id = 'm' },
md = { 'm', 'd', id = 'md' },
w = { 'w', id = 'w' },
wd = { 'w', 'd', id = 'wd' },
h = { 'H', id = 'h' },
hm = { 'H', 'M', id = 'hm' },
hms = { 'H', 'M', 'S', id = 'hms' },
d = { 'd', id = 'd' },
dh = { 'd', 'H', id = 'dh' },
dhm = { 'd', 'H', 'M', id = 'dhm' },
dhms = { 'd', 'H', 'M', 'S', id = 'dhms' },
ymdh = { 'y', 'm', 'd', 'H', id = 'ymdh' },
ymdhm = { 'y', 'm', 'd', 'H', 'M', id = 'ymdhm' },
ymwdh = { 'y', 'm', 'w', 'd', 'H', id = 'ymwdh' },
ymwdhm = { 'y', 'm', 'w', 'd', 'H', 'M', id = 'ymwdhm' },
},
sortable = {
off = false,
on = 'sortable_on',
table = 'sortable_table',
debug = 'sortable_debug',
},
}
local spellOptions = {
cardinal = {},
Cardinal = { upper = true },
cardinal_us = { us = true },
Cardinal_us = { us = true, upper = true },
ordinal = { ordinal = true },
Ordinal = { ordinal = true, upper = true },
ordinal_us = { ordinal = true, us = true },
Ordinal_us = { ordinal = true, us = true, upper = true },
}
local function dateExtract(frame)
-- Return part of a date after performing an optional operation.
local Date = getExports(frame)
local args = frame:getParent().args
local parms = {}
for i, v in ipairs(args) do
parms[i] = v
end
if yes(args.fix) then
table.insert(parms, 'fix')
end
if yes(args.partial) then
table.insert(parms, 'partial')
end
local show = stripToNil(args.show) or 'dmy'
local date = Date(unpack(parms))
if not date then
if show == 'format' then
return 'error'
end
return message('Need valid date')
end
local add = stripToNil(args.add)
if add then
for item in add:gmatch('%S+') do
date = date + item
if not date then
return message('Cannot add "' .. item .. '"')
end
end
end
local sortKey, result
local sortable = translateParameters.sortable[args.sortable]
if sortable then
local value = (date.partial and date.partial.first or date).jdz
sortKey = makeSort(value, sortable)
end
if show ~= 'hide' then
result = date[show]
if result == nil then
result = date:text(show)
elseif type(result) == 'boolean' then
result = result and '1' or '0'
else
result = tostring(result)
end
end
return (sortKey or '') .. (result or '')
end
local function rangeJoin(range)
-- Return text to be used between a range of ages.
return range == 'dash' and '–' or ' or '
end
local function makeText(values, components, names, options, noUpper)
-- Return wikitext representing an age or duration.
local text = Collection.new()
local count = #values
local sep = names.sep or ''
for i, v in ipairs(values) do
-- v is a number (say 4 for 4 years), or a table ({4,5} for 4 or 5 years).
local islist = type(v) == 'table'
if (islist or v > 0) or (text.n == 0 and i == count) or (text.n > 0 and components.keepZero) then
local fmt, vstr
if options.spell then
fmt = function(number)
return spellNumber(number, options.spell, noUpper or i)
end
elseif i == 1 and options.format == 'format_commas' then
-- Numbers after the first should be small and not need formatting.
fmt = formatNumber
else
fmt = tostring
end
if islist then
vstr = fmt(v[1]) .. rangeJoin(options.range)
noUpper = true
vstr = vstr .. fmt(v[2])
else
vstr = fmt(v)
end
local name = names[components[i]]
if name then
local plural = names.plural
if not plural or (islist and v[2] or v) == 1 then
plural = ''
end
text:add(vstr .. sep .. name .. plural)
else
text:add(vstr)
end
end
end
local first, last
if options.join == 'sep_space' then
first = ' '
last = ' '
elseif options.join == 'sep_comma' then
first = ', '
last = ', '
elseif options.join == 'sep_serialcomma' and text.n > 2 then
first = ', '
last = ', and '
else
first = ', '
last = ' and '
end
for i, v in ipairs(text) do
if i < text.n then
text[i] = v .. (i + 1 < text.n and first or last)
end
end
local sign = ''
if options.isnegative then
-- Do not display negative zero.
if text.n > 1 or (text.n == 1 and text[1]:sub(1, 1) ~= '0' ) then
if options.format == 'format_raw' then
sign = '-' -- plain hyphen so result can be used in a calculation
else
sign = '−' -- Unicode U+2212 MINUS SIGN
end
end
end
return
(options.sortKey or '') ..
(options.extra or '') ..
sign ..
text:join() ..
(options.suffix or '')
end
local function dateDifference(parms)
-- Return a formatted date difference using the given parameters
-- which have been validated.
local names = {
abbr_off = {
plural = 's',
sep = ' ',
y = 'year',
m = 'month',
w = 'week',
d = 'day',
H = 'hour',
M = 'minute',
S = 'second',
},
abbr_on = {
y = 'y',
m = 'm',
w = 'w',
d = 'd',
H = 'h',
M = 'm',
S = 's',
},
abbr_infant = { -- for {{age for infant}}
plural = 's',
sep = ' ',
y = 'yr',
m = 'mo',
w = 'wk',
d = 'day',
H = 'hr',
M = 'min',
S = 'sec',
},
abbr_raw = {},
}
local diff = parms.diff -- must be a valid date difference
local show = parms.show -- may be nil; default is set below
local abbr = parms.abbr or 'abbr_off'
local defaultJoin
if abbr ~= 'abbr_off' then
defaultJoin = 'sep_space'
end
if not show then
show = 'ymd'
if parms.disp == 'disp_age' then
if diff.years < 3 then
defaultJoin = 'sep_space'
if diff.years >= 1 then
show = 'ym'
else
show = 'md'
end
else
show = 'y'
end
end
end
if type(show) ~= 'table' then
show = translateParameters.show[show]
end
if parms.disp == 'disp_raw' then
defaultJoin = 'sep_space'
abbr = 'abbr_raw'
elseif parms.wantSc then
defaultJoin = 'sep_serialcomma'
end
local diffOptions = {
round = parms.round,
duration = parms.wantDuration,
range = parms.range and true or nil,
}
local sortKey
if parms.sortable then
local value = diff.age_days + (parms.wantDuration and 1 or 0) -- days and fraction of a day
if diff.isnegative then
value = -value
end
sortKey = makeSort(value, parms.sortable)
end
local textOptions = {
extra = parms.extra,
format = parms.format,
join = parms.sep or defaultJoin,
isnegative = diff.isnegative,
range = parms.range,
sortKey = sortKey,
spell = parms.spell,
suffix = parms.suffix, -- not currently used
}
if show.id == 'hide' then
return sortKey or ''
end
local values = { diff:age(show.id, diffOptions) }
if values[1] then
return makeText(values, show, names[abbr], textOptions)
end
if diff.partial then
-- Handle a more complex range such as
-- {{age_yd|20 Dec 2001|2003|range=yes}} → 1 year, 12 days or 2 years, 11 days
local opt = {
format = textOptions.format,
join = textOptions.join,
isnegative = textOptions.isnegative,
spell = textOptions.spell,
}
return
(textOptions.sortKey or '') ..
makeText({ diff.partial.mindiff:age(show.id, diffOptions) }, show, names[abbr], opt) ..
rangeJoin(textOptions.range) ..
makeText({ diff.partial.maxdiff:age(show.id, diffOptions) }, show, names[abbr], opt, true) ..
(textOptions.suffix or '')
end
return message('Parameter show=' .. show.id .. ' is not supported here')
end
local function getDates(frame, getopt)
-- Parse template parameters and return one of:
-- * date (a date table, if single)
-- * date1, date2 (two date tables, if not single)
-- * text (a string error message)
-- A missing date is optionally replaced with the current date.
-- If wantMixture is true, a missing date component is replaced
-- from the current date, so can get a bizarre mixture of
-- specified/current y/m/d as has been done by some "age" templates.
-- Some results may be placed in table getopt.
local Date, currentDate = getExports(frame)
getopt = getopt or {}
local function flagCurrent(text)
-- This allows the calling template to detect if the current date has been used,
-- that is, whether both dates have been entered in a template expecting two.
-- For example, an infobox may want the age when an event occurred, not the current age.
-- Don't bother detecting if wantMixture is used because not needed and it is a poor option.
if not text then
text = 'currentdate'
if getopt.flag == 'usesCurrent' then
getopt.usesCurrent = true
end
end
return text
end
local args = frame:getParent().args
local fields = {}
local isNamed = args.year or args.year1 or args.year2 or
args.month or args.month1 or args.month2 or
args.day or args.day1 or args.day2
if isNamed then
fields[1] = args.year1 or args.year
fields[2] = args.month1 or args.month
fields[3] = args.day1 or args.day
fields[4] = args.year2
fields[5] = args.month2
fields[6] = args.day2
else
for i = 1, 6 do
fields[i] = args[i]
end
end
local imax = 0
for i = 1, 6 do
fields[i] = stripToNil(fields[i])
if fields[i] then
imax = i
end
if getopt.omitZero and i % 3 ~= 1 then -- omit zero months and days as unknown values but keep year 0 which is 1 BCE
if tonumber(fields[i]) == 0 then
fields[i] = nil
getopt.partial = true
end
end
end
local fix = getopt.fix and 'fix' or ''
local noDefault = imax == 0 and getopt.noMissing
local partialText = getopt.partial and 'partial' or ''
local dates = {}
if isNamed or imax >= 3 then
local nrDates = getopt.single and 1 or 2
if getopt.wantMixture then
-- Cannot be partial since empty fields are set from current.
local components = { 'year', 'month', 'day' }
for i = 1, nrDates * 3 do
fields[i] = fields[i] or currentDate[components[i > 3 and i - 3 or i]]
end
for i = 1, nrDates do
local index = i == 1 and 1 or 4
dates[i] = Date(fields[index], fields[index+1], fields[index+2])
end
else
-- If partial dates are allowed, accept
-- year only, or
-- year and month only
-- Do not accept year and day without a month because that makes no sense
-- (and because, for example, Date('partial', 2001, nil, 12) sets day = nil, not 12).
for i = 1, nrDates do
local index = i == 1 and 1 or 4
local y, m, d = fields[index], fields[index+1], fields[index+2]
if (getopt.partial and y and (m or not d)) or (y and m and d) then
dates[i] = Date(fix, partialText, y, m, d)
elseif not y and not m and not d and not noDefault then
dates[i] = Date(flagCurrent())
end
end
end
elseif not noDefault then
getopt.textdates = true -- have parsed each date from a single text field
dates[1] = Date(fix, partialText, flagCurrent(fields[1]))
if not getopt.single then
dates[2] = Date(fix, partialText, flagCurrent(fields[2]))
end
end
if not dates[1] then
return message('Need valid year, month, day')
end
if getopt.single then
return dates[1]
end
if not dates[2] then
return message('Second date should be year, month, day')
end
return dates[1], dates[2]
end
local function ageGeneric(frame)
-- Return the result required by the specified template.
-- Can use sortable=x where x = on/table/off/debug in any supported template.
-- Some templates default to sortable=on but can be overridden.
local name = frame.args.template
if not name then
return message('The template invoking this must have "|template=x" where x is the wanted operation')
end
local args = frame:getParent().args
local specs = {
age_days = { -- {{age in days}}
show = 'd',
disp = 'disp_raw',
},
age_days_nts = { -- {{age in days nts}}
show = 'd',
disp = 'disp_raw',
format = 'format_commas',
sortable = 'on',
},
duration_days = { -- {{duration in days}}
show = 'd',
disp = 'disp_raw',
duration = true,
},
duration_days_nts = { -- {{duration in days nts}}
show = 'd',
disp = 'disp_raw',
format = 'format_commas',
sortable = 'on',
duration = true,
},
age_full_years = { -- {{age}}
show = 'y',
abbr = 'abbr_raw',
flag = 'usesCurrent',
omitZero = true,
range = 'no',
},
age_full_years_nts = { -- {{age nts}}
show = 'y',
abbr = 'abbr_raw',
format = 'format_commas',
sortable = 'on',
},
age_in_years = { -- {{age in years}}
show = 'y',
abbr = 'abbr_raw',
negative = 'error',
range = 'dash',
},
age_in_years_nts = { -- {{age in years nts}}
show = 'y',
abbr = 'abbr_raw',
negative = 'error',
range = 'dash',
format = 'format_commas',
sortable = 'on',
},
age_infant = { -- {{age for infant}}
-- Do not set show because special processing is done later.
abbr = yes(args.abbr) and 'abbr_infant' or 'abbr_off',
disp = 'disp_age',
sep = 'sep_space',
sortable = 'on',
},
age_m = { -- {{age in months}}
show = 'm',
disp = 'disp_raw',
},
age_w = { -- {{age in weeks}}
show = 'w',
disp = 'disp_raw',
},
age_wd = { -- {{age in weeks and days}}
show = 'wd',
},
age_yd = { -- {{age in years and days}}
show = 'yd',
format = 'format_commas',
sep = args.sep ~= 'and' and 'sep_comma' or nil,
},
age_yd_nts = { -- {{age in years and days nts}}
show = 'yd',
format = 'format_commas',
sep = args.sep ~= 'and' and 'sep_comma' or nil,
sortable = 'on',
},
age_ym = { -- {{age in years and months}}
show = 'ym',
sep = 'sep_comma',
},
age_ymd = { -- {{age in years, months and days}}
show = 'ymd',
range = true,
},
age_ymwd = { -- {{age in years, months, weeks and days}}
show = 'ymwd',
wantMixture = true,
},
}
local spec = specs[name]
if not spec then
return message('The specified template name is not valid')
end
if name == 'age_days' then
local su = stripToNil(args['show unit'])
if su then
if su == 'abbr' or su == 'full' then
spec.disp = nil
spec.abbr = su == 'abbr' and 'abbr_on' or nil
end
end
end
local partial, autofill
local range = stripToNil(args.range) or spec.range
if range then
-- Suppose partial dates are used and age could be 11 or 12 years.
-- "|range=" (empty value) has no effect (spec is used).
-- "|range=yes" or spec.range == true sets range = true (gives "11 or 12")
-- "|range=dash" or spec.range == 'dash' sets range = 'dash' (gives "11–12").
-- "|range=no" or spec.range == 'no' sets range = nil and fills each date in the diff (gives "12").
-- ("on" is equivalent to "yes", and "off" is equivalent to "no").
-- "|range=OTHER" sets range = nil and rejects partial dates.
range = ({ dash = 'dash', off = 'no', no = 'no', [true] = true })[range] or yes(range)
if range then
partial = true -- accept partial dates with a possible age range for the result
if range == 'no' then
autofill = true -- missing month/day in first or second date are filled from other date or 1
range = nil
end
end
end
local getopt = {
fix = yes(args.fix),
flag = stripToNil(args.flag) or spec.flag,
omitZero = spec.omitZero,
partial = partial,
wantMixture = spec.wantMixture,
}
local date1, date2 = getDates(frame, getopt)
if type(date1) == 'string' then
return date1
end
local format = stripToNil(args.format)
local spell = spellOptions[format]
if format then
format = 'format_' .. format
elseif name == 'age_days' and getopt.textdates then
format = 'format_commas'
end
local parms = {
diff = date2:subtract(date1, { fill = autofill }),
wantDuration = spec.duration or yes(args.duration),
range = range,
wantSc = yes(args.sc),
show = args.show == 'hide' and 'hide' or spec.show,
abbr = spec.abbr,
disp = spec.disp,
extra = makeExtra(args, getopt.usesCurrent and format ~= 'format_raw'),
format = format or spec.format,
round = yes(args.round),
sep = spec.sep,
sortable = translateParameters.sortable[args.sortable or spec.sortable],
spell = spell,
}
if (spec.negative or frame.args.negative) == 'error' and parms.diff.isnegative then
return message('The second date should not be before the first date')
end
return dateDifference(parms)
end
local function bda(frame)
-- Implement [[Template:Birth date and age]].
local args = frame:getParent().args
local options = { noMissing=true, single=true }
local date = getDates(frame, options)
if type(date) == 'string' then
return date -- error text
end
local Date = getExports(frame)
local diff = Date('currentdate') - date
if diff.isnegative or diff.years > 150 then
return message('Invalid birth date for calculating age')
end
local disp, show = 'disp_raw', 'y'
if diff.years < 2 then
disp = 'disp_age'
if diff.years == 0 and diff.months == 0 then
show = 'd'
else
show = 'm'
end
end
local df = stripToNil(args.df) -- day first (dmy); default is month first (mdy)
local result = df and
'%-d %B %-Y' or
'%B %-d, %-Y'
result = '(<span class="bday">%-Y-%m-%d</span>) </span>' .. result
result = '<span style="display:none"> ' ..
date:text(result) ..
'<span class="noprint ForceAgeToShow"> ' ..
'(age ' ..
dateDifference({
diff = diff,
show = show,
abbr = 'abbr_off',
disp = disp,
sep = 'sep_space',
}) ..
')</span>'
local warnings = tonumber(frame.args.warnings)
if warnings and warnings > 0 then
local good = {
df = true,
mf = true,
day = true,
day1 = true,
month = true,
month1 = true,
year = true,
year1 = true,
}
local invalid
local imax = options.textdates and 1 or 3
for k, _ in pairs(args) do
if type(k) == 'number' then
if k > imax then
invalid = tostring(k)
break
end
else
if not good[k] then
invalid = k
break
end
end
end
if invalid then
result = result .. message('invalid parameter ' .. invalid, 'warning')
end
end
return result
end
local function dateToGsd(frame)
-- Implement [[Template:Gregorian serial date]].
-- Return Gregorian serial date of the given date, or the current date.
-- The returned value is negative for dates before 1 January 1 AD
-- despite the fact that GSD is not defined for such dates.
local date = getDates(frame, { wantMixture=true, single=true })
if type(date) == 'string' then
return date
end
return tostring(date.gsd)
end
local function jdToDate(frame)
-- Return formatted date from a Julian date.
-- The result includes a time if the input includes a fraction.
-- The word 'Julian' is accepted for the Julian calendar.
local Date = getExports(frame)
local args = frame:getParent().args
local date = Date('juliandate', args[1], args[2])
if date then
return date:text()
end
return message('Need valid Julian date number')
end
local function dateToJd(frame)
-- Return Julian date (a number) from a date which may include a time,
-- or the current date ('currentdate') or current date and time ('currentdatetime').
-- The word 'Julian' is accepted for the Julian calendar.
local Date = getExports(frame)
local args = frame:getParent().args
local date = Date(args[1], args[2], args[3], args[4], args[5], args[6], args[7])
if date then
return tostring(date.jd)
end
return message('Need valid year/month/day or "currentdate"')
end
local function timeInterval(frame)
-- Implement [[Template:Time interval]].
-- There are two positional arguments: date1, date2.
-- The default for each is the current date and time.
-- Result is date2 - date1 formatted.
local Date = getExports(frame)
local args = frame:getParent().args
local parms = {
extra = makeExtra(args),
wantDuration = yes(args.duration),
range = yes(args.range) or (args.range == 'dash' and 'dash' or nil),
wantSc = yes(args.sc),
}
local fix = yes(args.fix) and 'fix' or ''
local date1 = Date(fix, 'partial', stripToNil(args[1]) or 'currentdatetime')
if not date1 then
return message('Invalid start date in first parameter')
end
local date2 = Date(fix, 'partial', stripToNil(args[2]) or 'currentdatetime')
if not date2 then
return message('Invalid end date in second parameter')
end
parms.diff = date2 - date1
for argname, translate in pairs(translateParameters) do
local parm = stripToNil(args[argname])
if parm then
parm = translate[parm]
if parm == nil then -- test for nil because false is a valid setting
return message('Parameter ' .. argname .. '=' .. args[argname] .. ' is invalid')
end
parms[argname] = parm
end
end
if parms.round then
local round = parms.round
local show = parms.show
if round ~= 'on' then
if show then
if show.id ~= round then
return message('Parameter show=' .. args.show .. ' conflicts with round=' .. args.round)
end
else
parms.show = translateParameters.show[round]
end
end
parms.round = true
end
return dateDifference(parms)
end
return {
age_generic = ageGeneric, -- can emulate several age templates
birth_date_and_age = bda, -- Template:Birth_date_and_age
gsd = dateToGsd, -- Template:Gregorian_serial_date
extract = dateExtract, -- Template:Extract
jd_to_date = jdToDate, -- Template:?
JULIANDAY = dateToJd, -- Template:JULIANDAY
time_interval = timeInterval, -- Template:Time_interval
}