How to Subtract from Time in Golang

The challenge

Clock shows h hours, m minutes and s seconds after midnight.

Your task is to write a function that returns the time since midnight in milliseconds.

Example:

h = 0 m = 1 s = 1 result = 61000

Input constraints:

  • 0 <= h <= 23
  • 0 <= m <= 59
  • 0 <= s <= 59

The solution in Golang

Option 1:

package solution func Past(h, m, s int) int { return (h*3600000 + m*60000 + s*1000) }
Code language: Go (go)

Option 2:

package solution func Past(h, m, s int) int { return (h*60*60+m*60+s)*1000 }
Code language: Go (go)

Option 3:

package solution import "time" func Past(h, m, s int) (ms int) { now := time.Unix(0, 0) now = now.Add(time.Duration(h) * time.Hour) now = now.Add(time.Duration(m) * time.Minute) now = now.Add(time.Duration(s) * time.Second) return int(now.Sub(time.Unix(0, 0)) / 1000000) }
Code language: Go (go)

Test cases to validate our solution

package solution_test import ( . "github.com/onsi/ginkgo" . "github.com/onsi/gomega" ) var _ = Describe("Basic tests", func() { It("Past(0, 1, 1)", func() { Expect(Past(0, 1, 1)).To(Equal(61000)) }) It("Past(1, 1, 1)", func() { Expect(Past(1, 1, 1)).To(Equal(3661000)) }) It("Past(0, 0, 0)", func() { Expect(Past(0, 0, 0)).To(Equal(0)) }) It("Past(1, 0, 1)", func() { Expect(Past(1, 0, 1)).To(Equal(3601000)) }) It("Past(1, 0, 0)", func() { Expect(Past(1, 0, 0)).To(Equal(3600000)) }) })
Code language: Go (go)
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