func (t Times) Swap(i, j int) {
	t[i], t[j] = t[j], t[i]
}
Swap implements sort.Interface.
package chart
import (
	"sort"
	"time"
)
var (
	_ Sequence       = (*Times)(nil)
	_ sort.Interface = (*Times)(nil)
)
type Times []time.Time
func (t Times) Array() []time.Time {
	return []time.Time(t)
}
func (t Times) Len() int {
	return len(t)
}
func (t Times) GetValue(index int) float64 {
	return ToFloat64(t[index])
}