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tv_usec 

        # Time.tv_usec

(from ruby core)
---
    time.usec    -> int
    time.tv_usec -> int

---

Returns the number of microseconds for the subsecond part of *time*. The
result is a non-negative integer less than 10**6.

    t = Time.now        #=> 2020-07-20 22:05:58.459785953 +0900
    t.usec              #=> 459785

If *time* has fraction of microsecond (such as nanoseconds), it is
truncated.

    t = Time.new(2000,1,1,0,0,0.666_777_888_999r)
    t.usec              #=> 666777

Time#subsec can be used to obtain the subsecond part exactly.

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