All information here was borrowed from the GDPR website https://eugdpr.org

An overview of key GDPR events from proposal, amendment, approval, adoption to enforcement.

Previous Legislation
1995: October 24th, Data Protection Directive 95/46/EC created to regulate the processing of personal data Legislative Proposals
2012: January 25th, initial proposal for updated data protection regulation by the European Commission
2014: March 12th, the European Parliament approved its own version of the regulation in its first reading
2015: June 15th, the Council of the European Union approved its version in its first reading, known as the general approach, allowing the regulation to pass into the final stage of legislation known as the Trilogue

Trilogue Timeline
2015: June 24th, meeting covering:
Package approach: Objective of Luxembourg Presidency for the proposed directive
Agreement on the overall roadmap for Trilogue negotiations
General method and approach for delegated and implementing acts

2015: July 14th, meeting covering:
Territorial scope (Article 3), Representative (Article 25)
International transfers (Chapter V), related definitions

2015: September 16-17th, meeting covering:
Data protection principles (Chapter II)
Data subject rights (Chapter III)
Controller and Processor (Chapter IV)

2015: September 29-30th, meeting covering:
Data protection principles (Chapter II)
Data subjects rights (Chapter III)
Controller and Processor (Chapter IV)

2015: October 15th, Trilogue covering:
Independent Supervisory Authorities (Chapter VI)
Cooperation and consistency (Chapter VII)
Remedies, liability and sanctions (Chapter VIII)

2015: October 28th, meeting covering:
Independent Supervisory Authorities (Chapter VI)
Cooperation and consistency (Chapter VII)
Remedies, liability and sanctions (Chapter VIII)

2015: November 11-12th, meeting covering:
Objectives and material scope (Chapter I)
Specific regimes (Chapter IX)

2015: November 24th, meeting covering:
All open issues from Chapter I to IX

2015: December 10th, meeting covering:
Delegated and Implementing Acts (Chapter X)
Final provisions (Chapter XI)

Remaining issues
2015: December 15th, meeting covering:
Delegated and Implementing Acts (Chapter X)
Final provisions (Chapter XI)

Approval & Adoption
2015: December 15th, the Parliament and Council have come to an agreement, and the text will be final as of the Official signing to take place in early January of 2016.
2016: January
April 8th: Adopted by the Council of the European Union
April 16th: Adoption by the European Parliament
May: Regulation will enter into force 20 days after it is published in the EU Official Journal

Enforcement
2018 May: Following a 2 year post-adoption grace period, the GDPR will become fully enforceable throughout the European Union.