fixed time conversion to local time when zone is specified and updated tests

Author: Crypt32

Asn1Parser/Utils/DateTimeUtils.cs

@@ -63,8 +63,7 @@ static DateTime extractDateTime(String strValue, out TimeZoneInfo? zone) {
         DateTime retValue = extractDateTime(strValue, msDelimiter, zoneDelimiter);
         if (hasZone) {
             zone = bindZone(hours, minutes);
-            //retValue = retValue.AddHours(hours);
-            //retValue = retValue.AddMinutes(minutes);
+            retValue = TimeZoneInfo.ConvertTimeToUtc(retValue, zone).ToLocalTime();
         } else {
             retValue = DateTime.SpecifyKind(retValue, DateTimeKind.Utc).ToLocalTime();
         }

tests/Asn1Parser.Tests/Asn1DateTimeTests.cs

@@ -13,7 +13,6 @@ public class Asn1DateTimeTests {
     public void TestZuluSimple() {
         var dt = DateTime.ParseExact("2024-08-07 16:12:37", "yyyy-MM-dd HH:mm:ss", null);
         var gt = new Asn1GeneralizedTime(dt);
-        Assert.AreEqual(DateTimeKind.Local, gt.Value.Kind);
         assertDateTimeEncode(Asn1Type.GeneralizedTime, gt, dt, "yyyyMMddHHmmssZ");
     }
     [TestMethod, Description("Test date/time with fractions and fraction is zero")]
@@ -58,6 +57,7 @@ public void TestTimeZoneFraction() {
     static void assertDateTimeEncode(Asn1Type expectedType, Asn1DateTime adt, DateTime dt, String expectedFormat, Boolean decode = false) {
         // assert type
         Assert.AreEqual((Byte)expectedType, adt.Tag);
+        Assert.AreEqual(DateTimeKind.Local, adt.Value.Kind);
 
         String gts = Encoding.ASCII.GetString(adt.GetRawData().Skip(2).ToArray());
         Assert.AreEqual(dt, adt.Value);