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diff --git a/luatz/strftime.lua b/luatz/strftime.lua
deleted file mode 100644
index 223da0f..0000000
--- a/luatz/strftime.lua
+++ /dev/null
@@ -1,210 +0,0 @@
-local strformat = string.format
-local floor = math.floor
-local function idiv(n, d)
-	return floor(n / d)
-end
-
-local c_locale = {
-	abday = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
-	day = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
-	abmon = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-	mon = {"January", "February", "March", "April", "May", "June",
-		"July", "August", "September", "October", "November", "December"};
-	am_pm = {"AM", "PM"};
-}
-
---- ISO-8601 week logic
--- ISO 8601 weekday as number with Monday as 1 (1-7)
-local function iso_8601_weekday(wday)
-	if wday == 1 then
-		return 7
-	else
-		return wday - 1
-	end
-end
-local iso_8601_week do
-	-- Years that have 53 weeks according to ISO-8601
-	local long_years = {}
-	for _, v in ipairs {
-		  4,   9,  15,  20,  26,  32,  37,  43,  48,  54,  60,  65,  71,  76,  82,
-		 88,  93,  99, 105, 111, 116, 122, 128, 133, 139, 144, 150, 156, 161, 167,
-		172, 178, 184, 189, 195, 201, 207, 212, 218, 224, 229, 235, 240, 246, 252,
-		257, 263, 268, 274, 280, 285, 291, 296, 303, 308, 314, 320, 325, 331, 336,
-		342, 348, 353, 359, 364, 370, 376, 381, 387, 392, 398
-	} do
-		long_years[v] = true
-	end
-	local function is_long_year(year)
-		return long_years[year % 400]
-	end
-	function iso_8601_week(self)
-		local wday = iso_8601_weekday(self.wday)
-		local n = self.yday - wday
-		local year = self.year
-		if n < -3 then
-			year = year - 1
-			if is_long_year(year) then
-				return year, 53, wday
-			else
-				return year, 52, wday
-			end
-		elseif n >= 361 and not is_long_year(year) then
-			return year + 1, 1, wday
-		else
-			return year, idiv(n + 10, 7), wday
-		end
-	end
-end
-
---- Specifiers
-local t = {}
-function t:a(locale)
-	return "%s", locale.abday[self.wday]
-end
-function t:A(locale)
-	return "%s", locale.day[self.wday]
-end
-function t:b(locale)
-	return "%s", locale.abmon[self.month]
-end
-function t:B(locale)
-	return "%s", locale.mon[self.month]
-end
-function t:c(locale)
-	return "%.3s %.3s%3d %.2d:%.2d:%.2d %d",
-		locale.abday[self.wday], locale.abmon[self.month],
-		self.day, self.hour, self.min, self.sec, self.year
-end
--- Century
-function t:C()
-	return "%02d", idiv(self.year, 100)
-end
-function t:d()
-	return "%02d", self.day
-end
--- Short MM/DD/YY date, equivalent to %m/%d/%y
-function t:D()
-	return "%02d/%02d/%02d", self.month, self.day, self.year % 100
-end
-function t:e()
-	return "%2d", self.day
-end
--- Short YYYY-MM-DD date, equivalent to %Y-%m-%d
-function t:F()
-	return "%d-%02d-%02d", self.year, self.month, self.day
-end
--- Week-based year, last two digits (00-99)
-function t:g()
-	return "%02d", iso_8601_week(self) % 100
-end
--- Week-based year
-function t:G()
-	return "%d", iso_8601_week(self)
-end
-t.h = t.b
-function t:H()
-	return "%02d", self.hour
-end
-function t:I()
-	return "%02d", (self.hour-1) % 12 + 1
-end
-function t:j()
-	return "%03d", self.yday
-end
-function t:m()
-	return "%02d", self.month
-end
-function t:M()
-	return "%02d", self.min
-end
--- New-line character ('\n')
-function t:n() -- luacheck: ignore 212
-	return "\n"
-end
-function t:p(locale)
-	return self.hour < 12 and locale.am_pm[1] or locale.am_pm[2]
-end
--- TODO: should respect locale
-function t:r(locale)
-	return "%02d:%02d:%02d %s",
-		(self.hour-1) % 12 + 1, self.min, self.sec,
-		self.hour < 12 and locale.am_pm[1] or locale.am_pm[2]
-end
--- 24-hour HH:MM time, equivalent to %H:%M
-function t:R()
-	return "%02d:%02d", self.hour, self.min
-end
-function t:s()
-	return "%d", self:timestamp()
-end
-function t:S()
-	return "%02d", self.sec
-end
--- Horizontal-tab character ('\t')
-function t:t() -- luacheck: ignore 212
-	return "\t"
-end
--- ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S
-function t:T()
-	return "%02d:%02d:%02d", self.hour, self.min, self.sec
-end
-function t:u()
-	return "%d", iso_8601_weekday(self.wday)
-end
--- Week number with the first Sunday as the first day of week one (00-53)
-function t:U()
-	return "%02d", idiv(self.yday - self.wday + 7, 7)
-end
--- ISO 8601 week number (00-53)
-function t:V()
-	return "%02d", select(2, iso_8601_week(self))
-end
--- Weekday as a decimal number with Sunday as 0 (0-6)
-function t:w()
-	return "%d", self.wday - 1
-end
--- Week number with the first Monday as the first day of week one (00-53)
-function t:W()
-	return "%02d", idiv(self.yday - iso_8601_weekday(self.wday) + 7, 7)
-end
--- TODO make t.x and t.X respect locale
-t.x = t.D
-t.X = t.T
-function t:y()
-	return "%02d", self.year % 100
-end
-function t:Y()
-	return "%d", self.year
-end
--- TODO timezones
-function t:z() -- luacheck: ignore 212
-	return "+0000"
-end
-function t:Z() -- luacheck: ignore 212
-	return "GMT"
-end
--- A literal '%' character.
-t["%"] = function(self) -- luacheck: ignore 212
-	return "%%"
-end
-
-local function strftime(format_string, timetable)
-	return (string.gsub(format_string, "%%([EO]?)(.)", function(locale_modifier, specifier)
-		local func = t[specifier]
-		if func then
-			return strformat(func(timetable, c_locale))
-		else
-			error("invalid conversation specifier '%"..locale_modifier..specifier.."'", 3)
-		end
-	end))
-end
-
-local function asctime(timetable)
-	-- Equivalent to the format string "%c\n"
-	return strformat(t.c(timetable, c_locale)) .. "\n"
-end
-
-return {
-	strftime = strftime;
-	asctime = asctime;
-}