How to return current date string?

[c4thead]

Hello, i've been trying to return a current date string in format YYYY.MM.DD but the LuaPlayer 0.20 will return 1970.01.01
I know that nobody really codes for PSP on an oldass LuaPlayer but that's my hobby and really the only thing i've gotten myself into, i used to program on it since 2016

The functions i assembled are:

function getTimeStr_HH_MM_SS()
	time = os.time()
	dateString = os.date("%c", time)
	dateFields = os.date("*t", time)

	hour = dateFields.hour
	if hour < 10 then hour = "0" .. hour end
	min = dateFields.min
	if min < 10 then min = "0" .. min end
	sec = dateFields.sec
	if sec < 10 then sec = "0" .. sec end

	return tostring(hour..""..min..""..sec)
end

function getDateStr_YYYY_MM_DD()
	time = os.time()
    Year = os.date("%Y", time)
    Month = os.date("%m", time)
    Day = os.date("%d", time)
	return string.format("%04d%02d%02d", Year, Month, Day)
end

And whenever i try to save the image by combining these two:

Canvas:save("Workspace/"..getDateStr_YYYY_MM_DD().."_"..getTimeStr_HH_MM_SS()..".png")

It ended up for me as 19700101_120539.png with the correct hour, minute, second but wrong year, month, day.
The time is right but the date is the default, is there anything that i do wrong or the LuaPlayer doesn't know how to fetch the right date?