#37 current date and time fetching function in sipp

[Rakesh]

Hi,

we need have a function to fetching current date and time from sipp running system. It will usefull for below usecase:

for Example :

As per RFC rfc7339.pdf --> I can use it for "oc-seq"

oc-seq = "oc-seq" EQUAL 112DIGIT "." 15DIGIT

oc-seq=1282321892.439

RFC 3261:
20.17 Date

The Date header field contains the date and time. Unlike HTTP/1.1,
SIP only supports the most recent RFC 1123 [20] format for dates. As
in [H3.3], SIP restricts the time zone in SIP-date to "GMT", while
RFC 1123 allows any time zone. An RFC 1123 date is case-sensitive.

The Date header field reflects the time when the request or response
is first sent.

  The Date header field can be used by simple end systems without a
  battery-backed clock to acquire a notion of current time.
  However, in its GMT form, it requires clients to know their offset
  from GMT.

Example:

  Date: Sat, 13 Nov 2010 23:29:00 GMT