Switch from Qt6 to Slint

lib/mirai-core/DateTime.cpp

@@ -0,0 +1,37 @@
+/*
+ * Mirai. Copyright (C) 2024 Vyn
+ * This file is licensed under version 3 of the GNU General Public License (GPL-3.0-only)
+ * The license can be found in the LICENSE file or at https://www.gnu.org/licenses/gpl-3.0.txt
+ */
+
+#include "mirai-core/DateTime.h"
+#include <charconv>
+#include <optional>
+#include <ranges>
+#include <string>
+#include <vector>
+
+namespace mirai
+{
+
+std::optional<mirai::Date> stringToDate(const std::string &dateStr)
+{
+	using std::operator""sv;
+
+	auto dateSplitView =
+		dateStr | std::views::split("-"sv) | std::views::transform([](auto v) -> int {
+			int i = 0;
+			std::from_chars(v.data(), v.data() + v.size(), i);
+			return i;
+		});
+	std::vector<int> dateSplit{dateSplitView.begin(), dateSplitView.end()};
+	if (dateSplit.size() != 3) {
+		return std::nullopt;
+	}
+
+	auto year = dateSplit[0];
+	auto month = dateSplit[1];
+	auto day = dateSplit[2];
+	return mirai::Date(year, static_cast<unsigned>(month), static_cast<unsigned>(day));
+}
+} // namespace mirai