capture static method
Implementation
static Future<ServerTimeClock?> capture(Object? raw) async {
final epoch = switch (raw) {
int value => value,
String value => int.tryParse(value.trim()),
_ => null,
};
// Timer instants use four-digit years; keep elapsed-time arithmetic in that range.
if (epoch == null || epoch <= 0 || epoch > 253402300799999) return null;
final clock = ServerTimeClock._(epoch);
if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) {
final nativeNow = await _nativeElapsedMilliseconds();
if (nativeNow == null) return null;
clock._nativeAnchorMs = nativeNow - clock._elapsed.elapsedMilliseconds;
}
return clock;
}