(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeInterface was created so that parameter, return, or property type declarations may accept either DateTimeImmutable or DateTime as a value. It is not possible to implement this interface with userland classes.
Common constants that allow for formatting DateTimeImmutable or DateTime objects through DateTimeImmutable::format() and DateTime::format() are also defined on this interface.
DateTimeInterface::ATOM
string
DATE_ATOMDATE_COOKIEDateTimeInterface::ISO8601
string
DATE_ISO8601Note: This format is not compatible with ISO-8601, but is left this way for backward compatibility reasons. Use
DateTimeInterface::ISO8601_EXPANDED,DateTimeInterface::ATOMfor compatibility with ISO-8601 instead. (ref ISO8601:2004 section 4.3.3 clause d)
DateTimeInterface::ISO8601_EXPANDED
string
DATE_ISO8601_EXPANDEDNote: This format allows for year ranges outside of ISO-8601's normal range of
0000-9999by always including a sign character. It also ensures that the timezone part (+01:00) is compatible with ISO-8601.
DateTimeInterface::RFC822
string
DATE_RFC822DateTimeInterface::RFC850
string
DATE_RFC850DateTimeInterface::RFC1036
string
DATE_RFC1036DateTimeInterface::RFC1123
string
DATE_RFC1123DateTimeInterface::RFC7231
string
DATE_RFC7231DateTimeInterface::RFC2822
string
DATE_RFC2822DateTimeInterface::RFC3339
string
DATE_RFC3339DATE_ATOM
DateTimeInterface::RFC3339_EXTENDED
string
DATE_RFC3339_EXTENDEDDateTimeInterface::RSS
string
DATE_RSSDateTimeInterface::W3C
string
DATE_W3C
| Version | Description |
|---|---|
| 8.4.0 | The class constants are now typed. |
| 8.2.0 |
The constant DateTimeInterface::ISO8601_EXPANDED
was added.
|
| 7.2.0 | The class constants of DateTime are now defined on DateTimeInterface. |