The Date header field reflects the time when the request or response was first sent.
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The Date header field reflects the time when the request or response was first sent.
Its syntax is defined in [H14.18] as follows:
Date = "Date" HCOLON HTTP-date
HTTP-date = rfc1123-date
rfc1123-date = wkday
"," SP date1
SP time
SP "GMT"
; day month year (e.g., 02 Jun 1982)
time = 2DIGIT ":" 2DIGIT ":" 2DIGIT
; 00:00:00 - 23:59:59
wkday = "Mon" / "Tue" / "Wed"
/ "Thu" / "Fri" / "Sat" / "Sun"
month = "Jan" / "Feb" / "Mar" / "Apr"
/ "May" / "Jun" / "Jul" / "Aug"
/ "Sep" / "Oct" / "Nov" / "Dec"
#define HTTP_DATE_INIT |
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Initializer for structure http_date_t.
A static http_date_t structure must be initialized with the HTTP_DATE_INIT() macro. For instance,
#define HTTPTAG_DATE |
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x) | |
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Tag list item for pointer to a Date header object.
The HTTPTAG_DATE() macro is used to include a tag item with a pointer to a http_date_t object in a tag list.
- Parameters
-
x | pointer to a http_date_t header structure, or NULL. |
#define HTTPTAG_DATE_STR |
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s) | |
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Tag list item for string with Date header value.
The HTTPTAG_DATE_STR() macro is used to include a tag item with a string containing value of a http_date_t header in a tag list.
- Parameters
-
s | pointer to a string containing http_date_t value, or NULL. |
The HTTPTAG_DATE_STR string can be converted to a http_date_t header structure by giving the string s has second argument to function http_date_make().
Enumerator |
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http_date_hash |
Hash of Date header.
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Copy a http_date_t header structure.
The function http_date_copy() copies a header structure hdr. If the header structure hdr contains a reference (hdr->h_next
) to a list of headers, all the headers in that list are copied, too. The function uses given memory home to allocate all the memory areas used to copy the header structure hdr.
- Parameters
-
home | memory home used to allocate new structure |
hdr | pointer to the header structure to be duplicated |
When copying, only the header structure and parameter lists attached to it are duplicated. The new header structure retains all the references to the strings within the old header, including the encoding of the old header, if present.
- Example
- Returns
- The function http_date_copy() returns a pointer to newly copied header structure, or NULL upon an error.
Create an Date header object.
The function http_date_create() creates a Date header object with the date date. If
- Date
- is 0, current time (as returned by msg_now()) is used.
- Parameters
-
home | memory home |
date | date expressed as seconds since Mon, 01 Jan 1900 00:00:00 |
- Returns
- The function http_date_create() returns a pointer to newly created Date header object when successful, or NULL upon an error.
Duplicate (deep copy) http_date_t
.
The function http_date_dup() duplicates a header structure hdr. If the header structure hdr contains a reference (hdr->x_next
) to a list of headers, all the headers in the list are duplicated, too.
- Parameters
-
home | memory home used to allocate new structure |
hdr | header structure to be duplicated |
When duplicating, all parameter lists and non-constant strings attached to the header are copied, too. The function uses given memory home to allocate all the memory areas used to copy the header.
- Example
- Returns
- The function http_date_dup() returns a pointer to the newly duplicated http_date_t header structure, or NULL upon an error.
Make a Date header from formatting result.
The function http_date_format() makes a new Date header object using formatting result as its value. The function first prints the arguments according to the format fmt specified. Then it allocates a new header structure, and uses the formatting result as the header value.
- Parameters
-
home | memory home used to allocate new header structure. |
fmt | string used as a printf()-style format |
... | argument list for format |
- Note
- This function is usually implemented as a macro calling msg_header_format().
- Returns
- The function http_date_format() returns a pointer to newly makes header structure, or NULL upon an error.
Initialize a structure http_date_t.
An http_date_t structure can be initialized with the http_date_init() function/macro. For instance,
Make a header structure http_date_t.
The function http_date_make() makes a new http_date_t header structure. It allocates a new header structure, and decodes the string s as the value of the structure.
- Parameters
-
home | memory home used to allocate new header structure. |
s | string to be decoded as value of the new header structure |
- Note
- This function is usually implemented as a macro calling http_header_make().
- Returns
- The function http_date_make() returns a pointer to newly maked http_date_t header structure, or NULL upon an error.
Test if header object is instance of http_date_t.
The function http_is_date() returns true (nonzero) if the header class is an instance of Date header object and false (zero) otherwise.
- Parameters
-
header | pointer to the header structure to be tested |
- Returns
- The function http_is_xdate() returns true (nonzero) if the header object is an instance of header date and false (zero) otherwise.
Header class for HTTP Date header.
The header class http_date_class defines how a HTTP Date header is parsed and printed. It also contains methods used by HTTP parser and other functions to manipulate the http_date_t header structure.