CoM – Il Blog di Carlo Becchi Compreresti un Raggio della Morte usato, da quest'uomo?


Stanotte scocca l’ora UNIX 1234567890 ! Venerdì 13 Linux Style!

I sistemi operativi UNIX utilizzano un modo curioso di memorizzare internamente ora e data: una variabile a 32 o 64 bit conta i secondi trascorsi dall'inizio dell'Epoca Unix, ovvero la mezzanotte UTC del 1° gennaio 1970.

Quindi l'ora sui sitemi BSD e Linux (e tutti gli altri sistemi derivati da UNIX) altro non è che un grosso numero intero, fatto che ha escluso questi sistemi operativi dal millenium bug, ma potrebbe impensierire gli "orologi" a 32bit nel 2038.

Questo fa si che di tanto in tanto, si presentino rappresentazioni temporali piuttosto curiose.

Una di queste avverrà stanotte: Venerdì 13 Febbraio 2009, alle 23:31:30 UTC (quindi in italia sarà già sabato 14) lo UNIX Time raggiungerà il conto 1234567890, come è facile verificare da qualunque terminale Linux:

Unix Time 1234567890

Un conto alla rovescia si trova qui.

La concomitanza con la data di Venerdì 13 ha dato origine ad articoli divertenti come questo di Gizmodo.

[Su segnalazione di Alessio]

Commenti (45) Trackback (0)

  2. @ER GENIO:

    In realtà è piuttosto semplice, mi spiego con parole diverse:

    I computer hanno un orologio interno, che come tutti gli orologi segna il tempo. I sistemi operativi devono memorizzare data e ora e possono scegliere modi diversi per farlo. Windows usa un metodo molto “umano”, cioè memorizza giorno, mese e anno e naturalmente ore,minuti e secondi.

    Unix invece si limita a contare i secondi trascorsi da una particolare data. Il 13/2/2009 per unix è solo una miliardata di secondi passati dal 1970.

    Qui finisce la tecnica ed inizia il costume.

    Gli appassionati di informatica si divertono ad evidenziare o addirittura festeggiare quando l’orologio di unix arriva ad un numero particolare. Questa notte il contatore è arrivato ad 1234567890. Tutto qui, niente più che un giochetto da tecnici. : - )

  3. Estiquatsi, pensa che sia proprio una bella idea festeggiare per questa cosa se si ritiene così importante

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