H = h + ((t1 — t0) / a)
H
= target block heighth
= current block heightt0
= current timestamp (in seconds)t1
= target timestamp (in seconds)a
= average time to solve a block (in seconds)last_block_number + ((future_time - time_now) / block_time)
2771338 + ((1482537600 - 1481214124) / 14) = 2865872