The use of a time line when studying history is quite common as it allows for the organization of events from beginning to end of what ever we are discussing.  A time line itself says perhaps more about our concept of time than the information on it. The Christian notion of creation implies the beginning of all things.  Additionally the culmination of what we call time will be the return of Jesus in final judgment.  Time for the Christian is linear, it has a beginning, when God spoke everything into existence and an end, the final Day of the Lord. For the Dharmic religions time is cyclic: the world is reborn and destroyed on a regular cycle.  For Big Bang scientists, the physics, the math that describes it all and also the notion of time, which figures prominently in the description, get sketchy the closer they get to the event horizon (the actual bang). Some now think that the expansion of the universe we currently observe will eventually slow, reverse and the universe will collapse into itself again. This is much like the cyclic notion of the Dharmic religions.  According to thermodynamics creation will suffer heat death as the universe continues to expand to where no more work can be done (because the temperature differences that is required to make thermodynamic systems function will be too small.) 

It is clear that not everyone believes that creation was created.  It is also clear that there are differing concepts of time among different religious and scientific groups.  (There is also disagreement as to whether reality is real but that is another discussion.)  Here then are some notions on the age of the earth and/or creation:

Year

Tradition

Comment

Eternity

Various

Postulate made by a number of groups including historical and contemporary scientists and certain New Age idealizations of the universe as a person.  The universe has always existed, so there is no "beginning" of the universe (though the Earth and other celestial objects may have come into being closer to the current day). One such former scientific theory is the steady state theory of the universe.

Cyclic

Dharmic

Buddhists, Jains and Hindus believe in a Cyclic Universe consisting of endless cycles of the Universe expanding, contracting and subsequently reforming.

11-20 billion years ago

Big Bang

The beginning of the Universe with an explosion followed by continuous expansion.  The notion of continuous expansion is questioned these days but the notion of the Big Bang still remains.  That the universe is actually bounded, had a beginning (the actual bang) and an end (total entropy or heat death) was the science of the day in the 1960s.  Because this squares with the Biblical story is use by some as a proof for the existence of God see Fr. Spitzer at the Magis Center.

4.55 (± 1%) billion years ago

Radiometric dating

The age of the planet earth.  Whether spawned by the Big Bang or some other forces.  This is based on the idea that radio active decay is a constant that has been the same for all time.

77.76 trillion years ago

Puranic Hinduism

As noted above Hindus and Buddhists see creation as cyclic each 50 "years of Brahma" the world is annihilated to be later reborn. ("Years of Brahma" are not the same as a solar year.) Fifty years of Brahma's are supposed to have elapsed, and we are now in the fifty-first; at the end of a Kalpa (aeon) the world is annihilated.

5199 BC

Maria de Agreda

 

August 11 or
August 13, 3114 BC

Maya civilization

 

23 October 4004 BC

Christian

James Ussher (4 January 1581–21 March 1656) was Anglican Archbishop of Armagh and Primate of all Ireland between 1625–1656.  He was a prolific scholar, who most famously published a chronology that purported to time and date Creation to the night preceding October 23, 4004 BC. (Wikipedia)

March 20-26, 4001 BC

Christian

E.W. Faulstich, Bible Chronology and the Scientific Method, Part II : Creation Through the First Temple., Spencer, Iowa: Chronology-History Research Institute, 1990 cited in (http://www.ldolphin.org/sewell/sewellchron.html

September 22 or March 29 3760 BC

Judaism