diff --git a/Userland/Libraries/LibCrypto/ASN1/ASN1.cpp b/Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
index 7fc07b1ca9..a87e5b4f54 100644
--- a/Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
+++ b/Userland/Libraries/LibCrypto/ASN1/ASN1.cpp
@@ -110,7 +110,9 @@ Optional<Core::DateTime> parse_utc_time(StringView time)
         return {};
     }
 
-    auto full_year = (Core::DateTime::now().year() / 100) * 100 + year_in_century.value();
+    // RFC5280 section 4.1.2.5.1.
+    auto full_year = year_in_century.value();
+    full_year += (full_year < 50) ? 2000 : 1900;
     auto full_seconds = seconds.value_or(0);
 
     // FIXME: Handle offsets!