15th November 7292 B.C was then Phalguna Amavasya. Valmiki states that
Ravan came out for the last battle on the Amavasya day (Yudh. 93/66) and
was killed. In the description of the battle, Sage Valmiki writes, "Kosala's
nakshatra Vishakha is aspected by Mars" (Yudh. 103/37). The annual
motion of Mars is 191.405 degrees. In 14 years, it will progress by 159.58
degrees. At the time of Rama's exile, Mars was at 303 deg. 159 deg. added
to this provides Mars at 102 deg. in Pushya. From Pushya Mars could cast
its fourth-sight on Vishakha. So, the calculations presented so far seem
to be correct. It also shows Valimiki's minute observations and time recording
capabilities. Thus the date of the last battle of the War is 15th November
7292 B.C.

  
Following are the dates of few events from the Ramayana:

    
Rama's Birth Date            4th  December 7323 B.C

    
Rama-Seeta Married           7th  April    7307 B.C

    
Rama Exiled                  29th November 7306 B.C.


Hanuman enters Lanka         1st September 7292 B.C

    
Hanuman meets Seeta          2nd September 7292 B.C.

    
Seetu (Bridge) built         26-30th Oct.  7292 B.C 
on the ocean

    
The War begins               3rd  November 7292 B.C

    
Kumbhakarna is killed        7th  November 7292 B.C.

    
Ravana is killed by Rama     15th November 7292 B.C.

    
Rama returns to Ayodhya       6th December 7272 B.C.