JPEG
JPEG standard

Part
ISO/IEC standard
ITU-T Rec.
First public release date
Latest amendment
Title
Description
Part 1
ISO/IEC 10918-1:1994
T.81 (09/92)
Sep 18, 1992
-
Requirements and guidelines
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Part 2
ISO/IEC 10918-2:1995
T.83 (11/94)
Nov 11, 1994
-
Compliance testing
Rules and checks for software conformance (to Part 1).
Part 3
ISO/IEC 10918-3:1997
T.84 (07/96)
Jul 3, 1996
Apr 1, 1999
Extensions
Set of extensions to improve the Part 1, including the Still Picture Interchange File Format (SPIFF).
Part 4
ISO/IEC 10918-4:1999
T.86 (06/98)
Jun 18, 1998
Jun 29, 2012
Registration of JPEG profiles, SPIFF profiles, SPIFF tags, SPIFF colour spaces, APPn markers, SPIFF compression types and Registration Authorities (REGAUT)
methods for registering some of the parameters used to extend JPEG
Part 5
ISO/IEC 10918-5:2013
T.871 (05/11)
May 14, 2011
-
JPEG File Interchange Format (JFIF)
A popular format which has been the de facto file format for images encoded by the JPEG standard. In 2009, the JPEG Committee formally established an Ad Hoc Group to standardize JFIF as JPEG Part 5.
Part 6
ISO/IEC 10918-6:2013
T.872 (06/12)
Jun 2012
-
Application to printing systems
Specifies a subset of features and application tools for the interchange of images encoded according to the ISO/IEC 10918-1 for printing.

Question: What was JPEG Part 5 and when was it released?
Answer: JPEG Part 5 was the JPEG File Interchange Format and it was released on May 14, 2011.