"L'opération est obsolète et peut ne jamais être incluse dans la chaîne"

Je lancemonnoeud comme celui-ci:

 ./tezos-node run --rpc-addr 127.0.0.1
 

Tout semble allerbien. Jefaisensuite:

 ./tezos-client account activate alice with FileFromFaucet.json --force
 

Mais celane fonctionnepas,je reçois l'erreur suivante:

 Warning:

                 This is NOT the Tezos Mainnet.

     The node you are connecting to claims to be running on the
               Tezos Alphanet DEVELOPMENT NETWORK.
          Do NOT use your fundraiser keys on this network.
          Alphanet is a testing network, with free tokens.

Waiting for the node to be bootstrapped before injection...
Current head: BLAFhGoUfmnS (timestamp: 2018-12-06T06:17:48Z, validation: 2019-04-03T14:08:44Z)
Node is bootstrapped, ready for injecting operations.
Operation successfully injected in the node.
Operation hash is 'opFZEnsWYL3AJfEnBDkjGdQggEDRrs1rqVYmNpebHkBcPvWsg6T'
Waiting for the operation to be included...
Fatal error:
  The operation opFZEnsWYL3AJfEnBDkjGdQggEDRrs1rqVYmNpebHkBcPvWsg6T is outdated and may never be included in the chain.
  We recommand to use an external block explorer.
 

Jene comprendstoujourspaspourquoi. Monnœudn'estpasmis àjour?

EDIT:

ok okthe ./tezos-client get timestamp && date -u -Isec la commandeme donne deuxfois différentsmoments. Cependant,je continue à attendreet rienne change. Commentpuis-je vous assurer quemonnœudestentièrement synchronisé?

I launch my node like this:

./tezos-node run --rpc-addr 127.0.0.1

Everything seems to be okay. I then do:

./tezos-client account activate alice with FileFromFaucet.json --force

But it doesn't work, I get the following error:

Warning:

                 This is NOT the Tezos Mainnet.

     The node you are connecting to claims to be running on the
               Tezos Alphanet DEVELOPMENT NETWORK.
          Do NOT use your fundraiser keys on this network.
          Alphanet is a testing network, with free tokens.

Waiting for the node to be bootstrapped before injection...
Current head: BLAFhGoUfmnS (timestamp: 2018-12-06T06:17:48Z, validation: 2019-04-03T14:08:44Z)
Node is bootstrapped, ready for injecting operations.
Operation successfully injected in the node.
Operation hash is 'opFZEnsWYL3AJfEnBDkjGdQggEDRrs1rqVYmNpebHkBcPvWsg6T'
Waiting for the operation to be included...
Fatal error:
  The operation opFZEnsWYL3AJfEnBDkjGdQggEDRrs1rqVYmNpebHkBcPvWsg6T is outdated and may never be included in the chain.
  We recommand to use an external block explorer.

I still don't understand why. Is my node not updated?

EDIT:

Okay the ./tezos-client get timestamp && date -u -Isec command gives me two differents times. However, I keep waiting and nothing change. How can I make sure my node is fully synchronized?