Costanti predefinite

    The DATE_ constants are defined and they offer standard date representations, which can be used along with the date format functions (like date()).

    Following constants specify a format returned by functions date_sunrise() and date_sunset().

    SUNFUNCS_RET_TIMESTAMP (int)
    Timestamp
    SUNFUNCS_RET_STRING (int)
    Hours:minutes (example: 08:02)
    SUNFUNCS_RET_DOUBLE (int)
    Hours as floating point number (example 8.75)
    DATE_* constants
    Costanti Descrizione
    DATE_ATOM Atom (example: 2005-08-15T15:52:01+00:00)
    HTTP Cookies (example: Monday, 15-Aug-2005 15:52:01 UTC)
    DATE_ISO8601 ISO-8601 (example: 2005-08-15T15:52:01+0000)

    Nota: This format is not compatible with ISO-8601, but is left this way for backward compatibility reasons. Use DATE_ISO8601_EXPANDED, DATE_ATOM for compatibility with ISO-8601 instead. (ref ISO8601:2004 section 4.3.3 clause d)

    DATE_ISO8601_EXPANDED ISO-8601 Expanded (example: +10191-07-26T08:59:52+01:00)

    Nota: This format allows for year ranges outside of ISO-8601's normal range of 0000-9999 by always including a sign character. It also addresses that that timezone part (+01:00) is compatible with ISO-8601.

    DATE_RFC822 RFC 822 (example: Mon, 15 Aug 05 15:52:01 +0000)
    DATE_RFC850 RFC 850 (example: Monday, 15-Aug-05 15:52:01 UTC)
    DATE_RFC1036 RFC 1036 (example: Mon, 15 Aug 05 15:52:01 +0000)
    DATE_RFC1123 RFC 1123 (example: Mon, 15 Aug 2005 15:52:01 +0000)
    DATE_RFC7231 RFC 7231 (as of PHP 7.0.19 and 7.1.5) (example: Sat, 30 Apr 2016 17:52:13 GMT)
    DATE_RFC2822 RFC 2822 (example: Mon, 15 Aug 2005 15:52:01 +0000)
    DATE_RFC3339 Same as DATE_ATOM.
    DATE_RFC3339_EXTENDED RFC 3339 EXTENDED format (example: 2005-08-15T15:52:01.000+00:00)
    DATE_RSS RSS (example: Mon, 15 Aug 2005 15:52:01 +0000). Alias di DATE_RFC1123.
    DATE_W3C World Wide Web Consortium (example: 2005-08-15T15:52:01+00:00). Alias di DATE_RFC3339.

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