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to_f 

        # Time.to_f

(from ruby core)
---
    time.to_f -> float

---

Returns the value of *time* as a floating point number of seconds since
the Epoch. The return value approximate the exact value in the Time
object because floating point numbers cannot represent all rational
numbers exactly.

    t = Time.now        #=> 2020-07-20 22:00:29.38740268 +0900
    t.to_f              #=> 1595250029.3874028
    t.to_i              #=> 1595250029

Note that IEEE 754 double is not accurate enough to represent the exact
number of nanoseconds since the Epoch. (IEEE 754 double has 53bit
mantissa. So it can represent exact number of nanoseconds only in `2 **
53 / 1_000_000_000 / 60 / 60 / 24 = 104.2` days.) When Ruby uses a
nanosecond-resolution clock function, such as `clock_gettime` of POSIX,
to obtain the current time, Time#to_f can lose information of a Time
object created with `Time.now`.

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