Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Cloud Firestore

Which platforms are affected?

Android, iOS, macOS, Web, Windows

Description

Creating a Timestamp (from package cloud_firestore_platform_interface) with the factories fromMicrosecondsSinceEpoch and fromMillisecondsSinceEpoch, passing a negative value with non-zero millisecond value (which could come from a DateTime object representing a date before 1970-01-01, causes _validateRange to throw because it fails the precondition _check(nanoseconds >= 0, 'nanoseconds', nanoseconds);.

The thrown exception is
Invalid argument(s): Timestamp nanoseconds out of range: -<nanoseconds>

This is due to erroneous calculation of nanoseconds in the body of the aforementioned factories.

Reproducing the issue

final date = DateTime(1969, 06, 22, 0, 0, 0, 123);
final timestamp = Timestamp.fromDate(date); // this throws

Firebase Core version

3.12.1

Flutter Version

3.29.1

Relevant Log Output

Flutter dependencies

No response

Additional context and comments

No response