# Convert `self` to a human readable String corresponding to `format`.
	# TODO document allowed format.
	fun strftime(format: String): String import String.to_cstring, CString.to_s `{
		char* buf, *c_format;

		buf = (char*)malloc(100);
		c_format = String_to_cstring(format);

		strftime(buf, 100, c_format, self);
		String s = CString_to_s(buf);
		free(buf);
		return s;
	`}