formatting date/time correctly for If-Modified-Since during AJAX call

[Cartoper]

How does one go about formatting the date/time string correctly to set
the If-Modified-Since to the current date/time in an AJAX call? I
know I need something like this:

request.setRequestHeader('If-Modified-Since','Wed, 05 Apr 2006
00:00:00 GMT');

But I don't know how to actually format the date/time string.

 

[GArlington]

How does one go about formatting the date/time string correctly to set
the If-Modified-Since to the current date/time in an AJAX call? I
know I need something like this:

request.setRequestHeader('If-Modified-Since','Wed, 05 Apr 2006
00:00:00 GMT');

But I don't know how to actually format the date/time string.

Why do you need to check it against current date/time? It will ALWAYS
return 304...
But, you might want to look at dateObj.toUTCString()

 

[Henry]

Why do you need to check it against current date/time? It will ALWAYS
return 304...
But, you might want to look at dateObj.toUTCString()

RFC 2616 mandates the date format to be used within HTTP 1.1 and so
with all relevant HTTP headers. No specification asserts that the -
toUTCStirng - method of javascript Date objects should have any
particular format. So the output of the - toUTCString - method may or
may not correspond with the HTTP spec's requirement, will very likely
vary between script language implementations and be subject to "more
tolerant" HTTP software. The result may work by coincidence in some
contexts (and from some specific locations) but is extremely unlikely
to be reliable or portable.