It will be hassle-free to follow form 26AS. If Interest is not displayed there for any reason, then calculate on the basis of days or weeks either way is fine as there will approximation on both cases. On the basis of days (A2 + S30 + O31 + N30 + D31 + J31 + F28 + M31 = 214 days), 55,000*214/365=32,246.58 so 32,247 (approx)
Alternatively,
For other sources you can follow cash basis or mercantile basis. So you may chose to show whole interest of 55,000 in next year.
So considering Total Income of each year, decide how you want to book interest.