func (WallClock) Now() time.Time {
	return time.Now()
}
Now returns the current local time.
package clock
import (
	"time"
)
type Clock interface {
	Now() time.Time
	UTC() time.Time
	After(d time.Duration) <-chan time.Time
}
type WallClock struct{}
func New() WallClock {
	return WallClock{}
}