Explain the use of Go's time and duration types for working with dates and times?

Go has two types for working with dates and times: time.Time and time.Duration.

**time.Time** is a type that represents a moment in time, including information about the year, month, day, hour, minute, second, and nanosecond. It can be used to represent both absolute and relative times, and supports a wide range of operations such as comparison, addition, and subtraction.

Here's an example of how to create a **time.Time** value:

package main

import (
    "fmt"
    "time"
)

func main() {
    t := time.Date(2023, time.March, 3, 10, 30, 0, 0, time.UTC)
    fmt.Println(t)
}

In this example, we create a **time.Time** value representing March 3rd, 2023 at 10:30am in the UTC timezone.

**time.Duration** is a type that represents a duration of time, such as 5 minutes, 30 seconds, or 100 milliseconds. It is represented as a signed integer number of nanoseconds, and supports a wide range of operations such as comparison, addition, and subtraction.

Here's an example of how to create a **time.Duration** value:

package main

import (
    "fmt"
    "time"
)

func main() {
    d := time.Duration(10 * time.Minute)
    fmt.Println(d)
}

In this example, we create a **time.Duration** value representing 10 minutes.

These types are very useful for working with dates and times in Go, and are used extensively throughout the standard library and third-party packages.