holiday_defs_se.go

// (c) 2014 Rick Arnold. Licensed under the BSD license (see LICENSE).

package cal

import "time"

// Holidays in Sweden
// Reference https://sv.wikipedia.org/wiki/Helgdagar_i_Sverige
// Days with the [2] notation, meaning days with reduced working hours
// haven't been added, as this is not regulated by law.
var (
	SENyarsdagen           = NewYear
	SETrettondedagJul      = NewHoliday(time.January, 6)
	SELangfredagen         = GoodFriday
	SEPaskdagen            = NewHolidayFunc(calculatePaskdagen)
	SEAnnandagPask         = EasterMonday
	SEForstaMaj            = NewHoliday(time.May, 1)
	SEKristiHimmelfardsdag = NewHolidayFunc(calculateKristiHimmelfardsdag)
	SEPingstdagen          = NewHolidayFunc(calculatePingstdagen)
	SENationaldagen        = NewHoliday(time.June, 6)
	SEMidsommarafton       = NewHolidayFunc(calculateMidsommarafton)
	SEMidsommardagen       = NewHolidayFunc(calculateMidsommardagen)
	SEAllaHelgonsDag       = NewHolidayFunc(calculateAllaHelgonsDag)
	SEJulafton             = NewHoliday(time.December, 24)
	SEJuldagen             = Christmas
	SEAnnandagJul          = Christmas2
	SENewYearsEve          = NewHoliday(time.December, 31)
)

// AddSwedishHolidays adds all Swedish holidays to the Calendar
func AddSwedishHolidays(c *Calendar) {
	c.AddHoliday(
		SENyarsdagen,
		SETrettondedagJul,
		SELangfredagen,
		SEPaskdagen,
		SEAnnandagPask,
		SEForstaMaj,
		SEKristiHimmelfardsdag,
		SEPingstdagen,
		SENationaldagen,
		SEMidsommarafton,
		SEMidsommardagen,
		SEAllaHelgonsDag,
		SEJulafton,
		SEJuldagen,
		SEAnnandagJul,
		SENewYearsEve,
	)
}

func calculatePaskdagen(year int, loc *time.Location) (time.Month, int) {
	easter := calculateEaster(year, loc)
	return easter.Month(), easter.Day()
}

func calculateKristiHimmelfardsdag(year int, loc *time.Location) (time.Month, int) {
	easter := calculateEaster(year, loc)
	// 39 days after Easter Sunday
	em := easter.AddDate(0, 0, +39)
	return em.Month(), em.Day()
}

func calculatePingstdagen(year int, loc *time.Location) (time.Month, int) {
	easter := calculateEaster(year, loc)
	// 50 days after Easter Sunday
	em := easter.AddDate(0, 0, +49)
	return em.Month(), em.Day()
}

func calculateMidsommarafton(year int, loc *time.Location) (time.Month, int) {
	t := time.Date(year, 6, 25, 0, 0, 0, 0, loc)

	for i := -1; i > -6; i-- {
		d := t.Add(time.Hour * 24 * time.Duration(i))
		if d.Weekday() == time.Friday {
			t = d
			break
		}
	}
	return t.Month(), t.Day()
}

func calculateMidsommardagen(year int, loc *time.Location) (time.Month, int) {
	t := time.Date(year, 6, 26, 0, 0, 0, 0, loc)

	for i := -1; i > -6; i-- {
		d := t.Add(time.Hour * 24 * time.Duration(i))
		if d.Weekday() == time.Saturday {
			t = d
			break
		}
	}
	return t.Month(), t.Day()
}

func calculateAllaHelgonsDag(year int, loc *time.Location) (time.Month, int) {
	t := time.Date(year, 11, 6, 0, 0, 0, 0, loc)

	for i := -1; i > -7; i-- {
		d := t.Add(time.Hour * 24 * time.Duration(i))
		if d.Weekday() == time.Saturday {
			t = d
			break
		}
	}
	return t.Month(), t.Day()
}