Date arithmetics

The Time type of the time package also allows you to perform basic arithmetic on the given date and time. This way, you can find out past and future dates.

How to do it...

1. Open the console and create the folder chapter04/recipe06.
2. Navigate to the directory.
3. Create the arithmetics.go file with the following content:

        package main

        import (
          "fmt"
          "time"
        )

        func main() {

          l, err := time.LoadLocation("Europe/Vienna")
          if err != nil {
            panic(err)
          }
          t := time.Date(2017, 11, 30, 11, 10, 20, 0, l)
          fmt.Printf("Default date is: %v\n", t)

          // Add 3 days
          r1 := t.Add(72 * time.Hour)
          fmt.Printf("Default date +3HRS is: %v\n", r1)

          // Subtract 3 days
          r1 = t.Add(-72 * time.Hour)
          fmt.Printf("Default date -3HRS is: %v\n", r1)

          // More comfortable api
          // to add days/months/years
          r1 = t.AddDate(1, 3...