Попередньо визначені константи

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

Константи	Опис
`DATE_ATOM`	Atom (example: `2005-08-15T15:52:01+00:00`)
`DATE_COOKIE`	HTTP Cookies (example: `Monday, 15-Aug-2005 15:52:01 UTC`)
`DATE_ISO8601`	ISO-8601 (example: `2005-08-15T15:52:01+0000`) Зауваження: 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`) Зауваження: 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`). Псевдонім `DATE_RFC1123`.
`DATE_W3C`	World Wide Web Consortium (example: `2005-08-15T15:52:01+00:00`). Псевдонім `DATE_RFC3339`.

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