403 lines
12 KiB
Go
403 lines
12 KiB
Go
package chart
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import (
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"sync"
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"time"
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)
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const (
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// AllDaysMask is a bitmask of all the days of the week.
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AllDaysMask = 1<<uint(time.Sunday) | 1<<uint(time.Monday) | 1<<uint(time.Tuesday) | 1<<uint(time.Wednesday) | 1<<uint(time.Thursday) | 1<<uint(time.Friday) | 1<<uint(time.Saturday)
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// WeekDaysMask is a bitmask of all the weekdays of the week.
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WeekDaysMask = 1<<uint(time.Monday) | 1<<uint(time.Tuesday) | 1<<uint(time.Wednesday) | 1<<uint(time.Thursday) | 1<<uint(time.Friday)
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//WeekendDaysMask is a bitmask of the weekend days of the week.
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WeekendDaysMask = 1<<uint(time.Sunday) | 1<<uint(time.Saturday)
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)
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var (
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// DaysOfWeek are all the time.Weekday in an array for utility purposes.
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DaysOfWeek = []time.Weekday{
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time.Sunday,
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time.Monday,
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time.Tuesday,
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time.Wednesday,
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time.Thursday,
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time.Friday,
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time.Saturday,
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}
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// WeekDays are the business time.Weekday in an array.
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WeekDays = []time.Weekday{
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time.Monday,
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time.Tuesday,
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time.Wednesday,
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time.Thursday,
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time.Friday,
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}
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// WeekendDays are the weekend time.Weekday in an array.
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WeekendDays = []time.Weekday{
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time.Sunday,
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time.Saturday,
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}
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//Epoch is unix epoc saved for utility purposes.
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Epoch = time.Unix(0, 0)
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)
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var (
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_easternLock sync.Mutex
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_eastern *time.Location
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)
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var (
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// NYSEOpen is when the NYSE opens.
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NYSEOpen = Date.Time(9, 30, 0, 0, Date.Eastern())
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// NYSEClose is when the NYSE closes.
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NYSEClose = Date.Time(16, 0, 0, 0, Date.Eastern())
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// NASDAQOpen is when NASDAQ opens.
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NASDAQOpen = Date.Time(9, 30, 0, 0, Date.Eastern())
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// NASDAQClose is when NASDAQ closes.
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NASDAQClose = Date.Time(16, 0, 0, 0, Date.Eastern())
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// NYSEArcaOpen is when NYSEARCA opens.
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NYSEArcaOpen = Date.Time(4, 0, 0, 0, Date.Eastern())
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// NYSEArcaClose is when NYSEARCA closes.
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NYSEArcaClose = Date.Time(20, 0, 0, 0, Date.Eastern())
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)
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// HolidayProvider is a function that returns if a given time falls on a holiday.
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type HolidayProvider func(time.Time) bool
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// defaultHolidayProvider implements `HolidayProvider` and just returns false.
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func defaultHolidayProvider(_ time.Time) bool { return false }
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var (
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// Date contains utility functions that operate on dates.
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Date = &date{}
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)
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type date struct{}
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// IsNYSEHoliday returns if a date was/is on a nyse holiday day.
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func (d date) IsNYSEHoliday(t time.Time) bool {
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te := t.In(d.Eastern())
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if te.Year() == 2013 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 21
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} else if te.Month() == 2 {
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return te.Day() == 18
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} else if te.Month() == 3 {
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return te.Day() == 29
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} else if te.Month() == 5 {
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return te.Day() == 27
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} else if te.Month() == 7 {
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return te.Day() == 4
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} else if te.Month() == 9 {
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return te.Day() == 2
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} else if te.Month() == 11 {
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return te.Day() == 28
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} else if te.Month() == 12 {
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return te.Day() == 25
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}
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} else if te.Year() == 2014 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 20
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} else if te.Month() == 2 {
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return te.Day() == 17
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} else if te.Month() == 4 {
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return te.Day() == 18
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} else if te.Month() == 5 {
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return te.Day() == 26
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} else if te.Month() == 7 {
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return te.Day() == 4
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} else if te.Month() == 9 {
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return te.Day() == 1
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} else if te.Month() == 11 {
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return te.Day() == 27
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} else if te.Month() == 12 {
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return te.Day() == 25
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}
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} else if te.Year() == 2015 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 19
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} else if te.Month() == 2 {
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return te.Day() == 16
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} else if te.Month() == 4 {
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return te.Day() == 3
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} else if te.Month() == 5 {
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return te.Day() == 25
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} else if te.Month() == 7 {
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return te.Day() == 3
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} else if te.Month() == 9 {
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return te.Day() == 7
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} else if te.Month() == 11 {
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return te.Day() == 26
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} else if te.Month() == 12 {
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return te.Day() == 25
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}
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} else if te.Year() == 2016 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 18
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} else if te.Month() == 2 {
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return te.Day() == 15
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} else if te.Month() == 3 {
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return te.Day() == 25
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} else if te.Month() == 5 {
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return te.Day() == 30
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} else if te.Month() == 7 {
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return te.Day() == 4
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} else if te.Month() == 9 {
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return te.Day() == 5
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} else if te.Month() == 11 {
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return te.Day() == 24 || te.Day() == 25
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} else if te.Month() == 12 {
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return te.Day() == 26
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}
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} else if te.Year() == 2017 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 16
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} else if te.Month() == 2 {
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return te.Day() == 20
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} else if te.Month() == 4 {
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return te.Day() == 15
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} else if te.Month() == 5 {
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return te.Day() == 29
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} else if te.Month() == 7 {
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return te.Day() == 4
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} else if te.Month() == 9 {
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return te.Day() == 4
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} else if te.Month() == 11 {
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return te.Day() == 23
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} else if te.Month() == 12 {
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return te.Day() == 25
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}
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} else if te.Year() == 2018 {
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if te.Month() == 1 {
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return te.Day() == 1 || te.Day() == 15
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} else if te.Month() == 2 {
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return te.Day() == 19
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} else if te.Month() == 3 {
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return te.Day() == 30
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} else if te.Month() == 5 {
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return te.Day() == 28
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} else if te.Month() == 7 {
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return te.Day() == 4
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} else if te.Month() == 9 {
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return te.Day() == 3
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} else if te.Month() == 11 {
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return te.Day() == 22
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} else if te.Month() == 12 {
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return te.Day() == 25
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}
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}
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return false
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}
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// IsNYSEArcaHoliday returns that returns if a given time falls on a holiday.
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func (d date) IsNYSEArcaHoliday(t time.Time) bool {
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return d.IsNYSEHoliday(t)
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}
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// IsNASDAQHoliday returns if a date was a NASDAQ holiday day.
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func (d date) IsNASDAQHoliday(t time.Time) bool {
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return d.IsNYSEHoliday(t)
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}
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// Eastern returns the eastern timezone.
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func (d date) Eastern() *time.Location {
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if _eastern == nil {
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_easternLock.Lock()
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defer _easternLock.Unlock()
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if _eastern == nil {
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_eastern, _ = time.LoadLocation("America/New_York")
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}
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}
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return _eastern
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}
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// Time returns a new time.Time for the given clock components.
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func (d date) Time(hour, min, sec, nsec int, loc *time.Location) time.Time {
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return time.Date(0, 0, 0, hour, min, sec, nsec, loc)
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}
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func (d date) Date(year, month, day int, loc *time.Location) time.Time {
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return time.Date(year, time.Month(month), day, 12, 0, 0, 0, loc)
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}
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// On returns the clock components of clock (hour,minute,second) on the date components of d.
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func (d date) On(clock, cd time.Time) time.Time {
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tzAdjusted := cd.In(clock.Location())
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return time.Date(tzAdjusted.Year(), tzAdjusted.Month(), tzAdjusted.Day(), clock.Hour(), clock.Minute(), clock.Second(), clock.Nanosecond(), clock.Location())
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}
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// NoonOn is a shortcut for On(Time(12,0,0), cd) a.k.a. noon on a given date.
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func (d date) NoonOn(cd time.Time) time.Time {
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return time.Date(cd.Year(), cd.Month(), cd.Day(), 12, 0, 0, 0, cd.Location())
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}
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// Optional returns a pointer reference to a given time.
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func (d date) Optional(t time.Time) *time.Time {
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return &t
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}
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// IsWeekDay returns if the day is a monday->friday.
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func (d date) IsWeekDay(day time.Weekday) bool {
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return !d.IsWeekendDay(day)
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}
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// IsWeekendDay returns if the day is a monday->friday.
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func (d date) IsWeekendDay(day time.Weekday) bool {
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return day == time.Saturday || day == time.Sunday
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}
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// Before returns if a timestamp is strictly before another date (ignoring hours, minutes etc.)
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func (d date) Before(before, reference time.Time) bool {
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tzAdjustedBefore := before.In(reference.Location())
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if tzAdjustedBefore.Year() < reference.Year() {
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return true
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}
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if tzAdjustedBefore.Month() < reference.Month() {
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return true
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}
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return tzAdjustedBefore.Year() == reference.Year() && tzAdjustedBefore.Month() == reference.Month() && tzAdjustedBefore.Day() < reference.Day()
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}
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// NextMarketOpen returns the next market open after a given time.
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func (d date) NextMarketOpen(after, openTime time.Time, isHoliday HolidayProvider) time.Time {
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afterLocalized := after.In(openTime.Location())
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todaysOpen := d.On(openTime, afterLocalized)
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if isHoliday == nil {
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isHoliday = defaultHolidayProvider
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}
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todayIsValidTradingDay := d.IsWeekDay(todaysOpen.Weekday()) && !isHoliday(todaysOpen)
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if (afterLocalized.Equal(todaysOpen) || afterLocalized.Before(todaysOpen)) && todayIsValidTradingDay {
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return todaysOpen
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}
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for cursorDay := 1; cursorDay < 7; cursorDay++ {
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newDay := todaysOpen.AddDate(0, 0, cursorDay)
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isValidTradingDay := d.IsWeekDay(newDay.Weekday()) && !isHoliday(newDay)
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if isValidTradingDay {
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return d.On(openTime, newDay)
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}
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}
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panic("Have exhausted day window looking for next market open.")
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}
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// NextMarketClose returns the next market close after a given time.
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func (d date) NextMarketClose(after, closeTime time.Time, isHoliday HolidayProvider) time.Time {
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afterLocalized := after.In(closeTime.Location())
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if isHoliday == nil {
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isHoliday = defaultHolidayProvider
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}
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todaysClose := d.On(closeTime, afterLocalized)
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if afterLocalized.Before(todaysClose) && d.IsWeekDay(todaysClose.Weekday()) && !isHoliday(todaysClose) {
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return todaysClose
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}
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if afterLocalized.Equal(todaysClose) { //rare but it might happen.
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return todaysClose
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}
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for cursorDay := 1; cursorDay < 6; cursorDay++ {
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newDay := todaysClose.AddDate(0, 0, cursorDay)
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if d.IsWeekDay(newDay.Weekday()) && !isHoliday(newDay) {
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return d.On(closeTime, newDay)
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}
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}
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panic("Have exhausted day window looking for next market close.")
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}
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// CalculateMarketSecondsBetween calculates the number of seconds the market was open between two dates.
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func (d date) CalculateMarketSecondsBetween(start, end, marketOpen, marketClose time.Time, isHoliday HolidayProvider) (seconds int64) {
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startEastern := start.In(d.Eastern())
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endEastern := end.In(d.Eastern())
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startMarketOpen := d.On(marketOpen, startEastern)
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startMarketClose := d.On(marketClose, startEastern)
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if !d.IsWeekendDay(startMarketOpen.Weekday()) && !isHoliday(startMarketOpen) {
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if (startEastern.Equal(startMarketOpen) || startEastern.After(startMarketOpen)) && startEastern.Before(startMarketClose) {
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if endEastern.Before(startMarketClose) {
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seconds += int64(endEastern.Sub(startEastern) / time.Second)
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} else {
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seconds += int64(startMarketClose.Sub(startEastern) / time.Second)
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}
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}
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}
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cursor := d.NextMarketOpen(startMarketClose, marketOpen, isHoliday)
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for d.Before(cursor, endEastern) {
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if d.IsWeekDay(cursor.Weekday()) && !isHoliday(cursor) {
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close := d.NextMarketClose(cursor, marketClose, isHoliday)
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seconds += int64(close.Sub(cursor) / time.Second)
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}
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cursor = cursor.AddDate(0, 0, 1)
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}
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finalMarketOpen := d.NextMarketOpen(cursor, marketOpen, isHoliday)
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finalMarketClose := d.NextMarketClose(cursor, marketClose, isHoliday)
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if endEastern.After(finalMarketOpen) {
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if endEastern.Before(finalMarketClose) {
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seconds += int64(endEastern.Sub(finalMarketOpen) / time.Second)
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} else {
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seconds += int64(finalMarketClose.Sub(finalMarketOpen) / time.Second)
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}
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}
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return
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}
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const (
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_secondsPerDay = 60 * 60 * 24
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)
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func (d date) Diff(t1, t2 time.Time) (days int64) {
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t1n := t1.Unix()
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t2n := t2.Unix()
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diff := t1n - t2n
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return diff / (_secondsPerDay)
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}
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// NextDay returns the timestamp advanced a day.
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func (d date) NextDay(ts time.Time) time.Time {
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return ts.AddDate(0, 0, 1)
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}
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// NextHour returns the next timestamp on the hour.
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func (d date) NextHour(ts time.Time) time.Time {
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//advance a full hour ...
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advanced := ts.Add(time.Hour)
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minutes := time.Duration(advanced.Minute()) * time.Minute
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final := advanced.Add(-minutes)
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return time.Date(final.Year(), final.Month(), final.Day(), final.Hour(), 0, 0, 0, final.Location())
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}
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// NextDayOfWeek returns the next instance of a given weekday after a given timestamp.
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func (d date) NextDayOfWeek(after time.Time, dayOfWeek time.Weekday) time.Time {
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afterWeekday := after.Weekday()
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if afterWeekday == dayOfWeek {
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return after.AddDate(0, 0, 7)
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}
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// 1 vs 5 ~ add 4 days
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if afterWeekday < dayOfWeek {
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dayDelta := int(dayOfWeek - afterWeekday)
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return after.AddDate(0, 0, dayDelta)
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}
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// 5 vs 1, add 7-(5-1) ~ 3 days
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dayDelta := 7 - int(afterWeekday-dayOfWeek)
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return after.AddDate(0, 0, dayDelta)
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}
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