added checks for RTC conversions

CMakeLists.txt

@@ -17,6 +17,7 @@ set(SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/klib/vector2.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/klib/vector3.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/klib/crypt/base32.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/klib/io/rtc.cpp
 )
 
 # add our executable

klib/io/rtc.cpp

@@ -0,0 +1,34 @@
+#include "../../catch.hpp"
+#include <klib/io/rtc.hpp>
+
+TEST_CASE("datetime to epoch conversion is correct", "[klib::io::rtc]") {
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2024, 1, 7, 23, 40, 6).value == 1704670806);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(1970, 1, 1, 0, 0, 0).value == 0);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2000, 1, 1, 0, 0, 0).value == 946684800);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2050, 1, 1, 0, 0, 0).value == 2524608000);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2099, 1, 1, 0, 0, 0).value == 4070908800);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2098, 12, 31, 23, 59, 59).value == 4070908799);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2097, 12, 31, 23, 59, 59).value == 4039372799);
+    REQUIRE(klib::io::rtc::datetime_to_epoch(2050, 12, 31, 23, 59, 59).value == 2556143999);
+}
+
+TEST_CASE("epoch to datetime conversion is correct", "[klib::io::rtc]") {
+    const auto x = klib::io::rtc::epoch_to_datetime(4070908799);
+    const auto y = klib::io::rtc::datetime{2098, 12, 31, 23, 59, 59};
+    CHECK(x.year == y.year);
+    CHECK(x.month == y.month);
+    CHECK(x.day == y.day);
+    CHECK(x.hours == y.hours);
+    CHECK(x.minutes == y.minutes);
+    CHECK(x.seconds == y.seconds);
+
+    REQUIRE(klib::io::rtc::epoch_to_datetime(1704670806) == klib::io::rtc::datetime{2024, 1, 7, 23, 40, 6});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(0) == klib::io::rtc::datetime{1970, 1, 1, 0, 0, 0});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(946684800) == klib::io::rtc::datetime{2000, 1, 1, 0, 0, 0});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(2524608000) == klib::io::rtc::datetime{2050, 1, 1, 0, 0, 0});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(4070908800) == klib::io::rtc::datetime{2099, 1, 1, 0, 0, 0});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(4070908799) == klib::io::rtc::datetime{2098, 12, 31, 23, 59, 59});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(4039372799) == klib::io::rtc::datetime{2097, 12, 31, 23, 59, 59});
+    REQUIRE(klib::io::rtc::epoch_to_datetime(2556143999) == klib::io::rtc::datetime{2050, 12, 31, 23, 59, 59});
+}
+