fix(cloud_firestore): correct nanoseconds calculation for pre-1970 dates #17195
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m4tbat
reviewed
Mar 13, 2025
Comment on lines
-43
to
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| final int seconds = microseconds ~/ _kMillion; | ||
| final int nanoseconds = (microseconds - seconds * _kMillion) * _kThousand; | ||
| int seconds = microseconds ~/ _kMillion; | ||
| int nanoseconds = (microseconds - seconds * _kMillion) * _kThousand; | ||
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| // Matches implementation in Android SDK: | ||
| // https://github.com/firebase/firebase-android-sdk/blob/master/firebase-common/src/main/java/com/google/firebase/Timestamp.kt#L114-L121 | ||
| if (nanoseconds < 0) { | ||
| seconds -= 1; | ||
| nanoseconds += _kBillion; | ||
| } |
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@SelaseKay
Also the factory fromMillisecondsSinceEpoch should be fixed.
I personally would delegate the milliseconds one to the microseconds one:
factory Timestamp.fromMillisecondsSinceEpoch(int milliseconds) {
return fromMicrosecondsSinceEpoch(milliseconds * _kThousand);
}but I don't know if there are other considerations to be done
Lyokone
reviewed
Mar 14, 2025
Comment on lines
+84
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| test('Timestamp should not throw for dates before 1970', () { | ||
| final dates = [ | ||
| DateTime(1969, 06, 22, 0, 0, 0, 123), | ||
| DateTime(1969, 12, 31, 23, 59, 59, 999), | ||
| DateTime(1900, 01, 01, 12, 30, 45, 500), | ||
| DateTime(1800, 07, 04, 18, 15, 30, 250), | ||
| DateTime(0001, 01, 01, 00, 00, 00, 001), | ||
| ]; | ||
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| for (final date in dates) { | ||
| try { | ||
| final timestamp = Timestamp.fromDate(date); | ||
| expect(timestamp, isA<Timestamp>()); | ||
| } catch (e) { | ||
| fail('Timestamp.fromDate threw an error: $e'); | ||
| } | ||
| } | ||
| }); |
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You should be able to go from Date to Timestamp to Date and check that the value is still correct.
You are missing the second half of the test.
You should also have the same test were you store it in Firestore and then read firestore to see if it was correctly stored.
Lyokone
approved these changes
Mar 14, 2025
|
@Lyokone notice that the factory |
MichaelVerdon
approved these changes
Mar 19, 2025
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Related Issues
Fixes #17189
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