diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
index ef8ff18614..e8d245a2f8 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
@@ -70,10 +70,10 @@ BigInt* get_epoch_from_iso_parts(GlobalObject& global_object, i32 year, u8 month
     return js_bigint(vm, Crypto::SignedBigInteger::create_from(static_cast<i64>(ms.as_double())).multiplied_by(Crypto::UnsignedBigInteger { 1'000'000 }).plus(Crypto::SignedBigInteger::create_from((i64)microsecond * 1000)).plus(Crypto::SignedBigInteger(nanosecond)));
 }
 
-// -864 * 10^19 - 864 * 10^14
-const auto DATETIME_NANOSECONDS_MIN = "-8640086400000000000000"_sbigint;
-// +864 * 10^19 + 864 * 10^14
-const auto DATETIME_NANOSECONDS_MAX = "8640086400000000000000"_sbigint;
+// -864 * 10^19 - 864 * 10^11
+const auto DATETIME_NANOSECONDS_MIN = "-8640000086400000000000"_sbigint;
+// +864 * 10^19 + 864 * 10^11
+const auto DATETIME_NANOSECONDS_MAX = "8640000086400000000000"_sbigint;
 
 // 5.5.2 ISODateTimeWithinLimits ( year, month, day, hour, minute, second, millisecond, microsecond, nanosecond ), https://tc39.es/proposal-temporal/#sec-temporal-isodatetimewithinlimits
 bool iso_date_time_within_limits(GlobalObject& global_object, i32 year, u8 month, u8 day, u8 hour, u8 minute, u8 second, u16 millisecond, u16 microsecond, u16 nanosecond)
@@ -83,13 +83,13 @@ bool iso_date_time_within_limits(GlobalObject& global_object, i32 year, u8 month
     // 2. Let ns be ! GetEpochFromISOParts(year, month, day, hour, minute, second, millisecond, microsecond, nanosecond).
     auto ns = get_epoch_from_iso_parts(global_object, year, month, day, hour, minute, second, millisecond, microsecond, nanosecond);
 
-    // 3. If ns ≤ -8.64 × 10^21 - 8.64 × 10^16, then
+    // 3. If ns ≤ -8.64 × 10^21 - 8.64 × 10^13, then
     if (ns->big_integer() <= DATETIME_NANOSECONDS_MIN) {
         // a. Return false.
         return false;
     }
 
-    // 4. If ns ≥ 8.64 × 10^21 + 8.64 × 10^16, then
+    // 4. If ns ≥ 8.64 × 10^21 + 8.64 × 10^13, then
     if (ns->big_integer() >= DATETIME_NANOSECONDS_MAX) {
         // a. Return false.
         return false;