Go time comparison

Question

I\'m trying to create simple function just to change time zone of a time to another (Lets assume UTC to +0700 WIB). Here is the source code. I have 2 functions, first

Answer 1

Dates in golang must be compared with Equal method. Method Date returns Time type.

func Date(year int, month Month, day, hour, min, sec, nsec int, loc *Location) Time

and Time type have Equal method.

func (t Time) Equal(u Time) bool

Equal reports whether t and u represent the same time instant. Two times can be equal even if they are in different locations. For example, 6:00 +0200 CEST and 4:00 UTC are Equal. See the documentation on the Time type for the pitfalls of using == with Time values; most code should use Equal instead.

Example

package main

import (
    "fmt"
    "time"
)

func main() {
    secondsEastOfUTC := int((8 * time.Hour).Seconds())
    beijing := time.FixedZone("Beijing Time", secondsEastOfUTC)

    // Unlike the equal operator, Equal is aware that d1 and d2 are the
    // same instant but in different time zones.
    d1 := time.Date(2000, 2, 1, 12, 30, 0, 0, time.UTC)
    d2 := time.Date(2000, 2, 1, 20, 30, 0, 0, beijing)

    datesEqualUsingEqualOperator := d1 == d2
    datesEqualUsingFunction := d1.Equal(d2)

    fmt.Printf("datesEqualUsingEqualOperator = %v\n", datesEqualUsingEqualOperator)
    fmt.Printf("datesEqualUsingFunction = %v\n", datesEqualUsingFunction)

}

datesEqualUsingEqualOperator = false

datesEqualUsingFunction = true

resources

• Time type documentation
• Equal method documentation
• time.Date