Question

12years 3months into seconds

Answer 1

12 YEARS and 3 MONTHS will be equal to 386316000 seconds  
hope it may help you

Answer 2

1 d = 24 hr
365 d = 365 x 24
       1 yr = 8760 hr
      12yr = 8760 x 12 x 365
              = 38368800 hr
3 months = 31 + 30 +31 = 92 d
            1d = 24 hr
            92d = 92 x 24
                    = 2208 hr
 total hrs = 38368800 + 2208
                = 38371008
1 hr = 60m x 60 s
     = 3600 s
38371008 hr = ??????
find that out,
it is a big answer,
hop this helped