Given an int64 timestamp `s`, and `int64` interval `u`, get the "now" time `t` in `int64` form, calculate and return `s` + `u` - `t`. "now" time is `time.Now().UnixNano()`
Given an int64 timestamp
s, andint64intervalu, get the "now" timetinint64form, calculate and returns+u-t."now" time is
time.Now().UnixNano()