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ceil 

        # Time.ceil

(from ruby core)
---
    time.ceil([ndigits])   -> new_time

---

Ceils subsecond to a given precision in decimal digits (0 digits by
default). It returns a new Time object. `ndigits` should be zero or a
positive integer.

    t = Time.utc(2010,3,30, 5,43,25.0123456789r)
    t                      #=> 2010-03-30 05:43:25 123456789/10000000000 UTC
    t.ceil                 #=> 2010-03-30 05:43:26 UTC
    t.ceil(0)              #=> 2010-03-30 05:43:26 UTC
    t.ceil(1)              #=> 2010-03-30 05:43:25.1 UTC
    t.ceil(2)              #=> 2010-03-30 05:43:25.02 UTC
    t.ceil(3)              #=> 2010-03-30 05:43:25.013 UTC
    t.ceil(4)              #=> 2010-03-30 05:43:25.0124 UTC

    t = Time.utc(1999,12,31, 23,59,59)
    (t + 0.4).ceil         #=> 2000-01-01 00:00:00 UTC
    (t + 0.9).ceil         #=> 2000-01-01 00:00:00 UTC
    (t + 1.4).ceil         #=> 2000-01-01 00:00:01 UTC
    (t + 1.9).ceil         #=> 2000-01-01 00:00:01 UTC

    t = Time.utc(1999,12,31, 23,59,59)
    (t + 0.123456789).ceil(4)  #=> 1999-12-31 23:59:59.1235 UTC

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