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compare: kayprish:6f6b203c5bcc1e397371473265af7596a216d377
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001ac47315 ... 6f6b203c5b

Author SHA1 Message Date
Petar Kapriš 6f6b203c5b Add TimeToJDate with tests 2024-07-22 21:16:24 +02:00
Petar Kapriš d862f6c35d Rename ToTime->JDateToTime 2024-07-22 21:15:20 +02:00
2 changed files with 105 additions and 3 deletions
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25
julian/julian.go
View file

@ -97,7 +97,7 @@ func New(year int, month time.Month, day int) Date {
// The algorithm, in large part: follows this article:
// https://en.wikipedia.org/wiki/Conversion_between_Julian_and_Gregorian_calendars
func ToTime(d Date) time.Time {
func JDateToTime(d Date) time.Time {
offset := -2
borderDate := Date{100, time.March, 2}
// We don't increase the offset for years divisible by 400, ie. every
@ -120,3 +120,26 @@ func ToTime(d Date) time.Time {
d = dateDiff(d, offset)
return time.Date(d.year, d.month, d.day, 0, 0, 0, 0, time.UTC)
}
func TimeToJDate(t time.Time) Date {
offset := -2
// The date when the offset changes in the gregorian calendar is always
// 1st of March, so we can always just check the year, and see if we're
// past 1st of March year
year := t.Year()
if t.Month() < time.March {
year--
}
borderYear := 100
for year >= borderYear {
if borderYear%400 != 0 {
offset++
}
borderYear += 100
}
d := Date{t.Year(), t.Month(), t.Day()}
d = dateDiff(d, -offset)
return d
}

83
julian/julian_test.go
View file

@ -67,7 +67,7 @@ func TestNextMonth(t *testing.T) {
}
}
func TestToTime(t *testing.T) {
func TestJDateToTime(t *testing.T) {
gDate := func(year int, month time.Month, day int) time.Time {
return time.Date(year, month, day, 0, 0, 0, 0, time.UTC)
}
@ -138,7 +138,86 @@ func TestToTime(t *testing.T) {
for _, tt := range tests {
testname := fmt.Sprintf("%v, %v", tt.d, tt.want)
t.Run(testname, func(t *testing.T) {
ans := ToTime(tt.d)
ans := JDateToTime(tt.d)
if ans != tt.want {
t.Errorf("got %v, want %v", ans, tt.want)
}
})
}
}
func TestTimeToJDate(t *testing.T) {
gDate := func(year int, month time.Month, day int) time.Time {
return time.Date(year, month, day, 0, 0, 0, 0, time.UTC)
}
var tests = []struct {
gd time.Time
want Date
}{
{gDate(100, time.February, 27), Date{100, time.February, 29}},
{gDate(100, time.February, 28), Date{100, time.March, 1}},
{gDate(100, time.March, 1), Date{100, time.March, 2}},
{gDate(200, time.February, 27), Date{200, time.February, 28}},
{gDate(200, time.February, 28), Date{200, time.February, 29}},
{gDate(200, time.March, 1), Date{200, time.March, 1}},
{gDate(300, time.February, 28), Date{300, time.February, 28}},
{gDate(300, time.March, 1), Date{300, time.February, 29}},
{gDate(300, time.March, 2), Date{300, time.March, 1}},
{gDate(500, time.March, 1), Date{500, time.February, 28}},
{gDate(500, time.March, 2), Date{500, time.February, 29}},
{gDate(500, time.March, 3), Date{500, time.March, 1}},
{gDate(600, time.March, 2), Date{600, time.February, 28}},
{gDate(600, time.March, 3), Date{600, time.February, 29}},
{gDate(600, time.March, 4), Date{600, time.March, 1}},
{gDate(700, time.March, 3), Date{700, time.February, 28}},
{gDate(700, time.March, 4), Date{700, time.February, 29}},
{gDate(700, time.March, 5), Date{700, time.March, 1}},
{gDate(900, time.March, 4), Date{900, time.February, 28}},
{gDate(900, time.March, 5), Date{900, time.February, 29}},
{gDate(900, time.March, 6), Date{900, time.March, 1}},
{gDate(1000, time.March, 5), Date{1000, time.February, 28}},
{gDate(1000, time.March, 6), Date{1000, time.February, 29}},
{gDate(1000, time.March, 7), Date{1000, time.March, 1}},
{gDate(1100, time.March, 6), Date{1100, time.February, 28}},
{gDate(1100, time.March, 7), Date{1100, time.February, 29}},
{gDate(1100, time.March, 8), Date{1100, time.March, 1}},
{gDate(1300, time.March, 7), Date{1300, time.February, 28}},
{gDate(1300, time.March, 8), Date{1300, time.February, 29}},
{gDate(1300, time.March, 9), Date{1300, time.March, 1}},
{gDate(1400, time.March, 8), Date{1400, time.February, 28}},
{gDate(1400, time.March, 9), Date{1400, time.February, 29}},
{gDate(1400, time.March, 10), Date{1400, time.March, 1}},
{gDate(1500, time.March, 9), Date{1500, time.February, 28}},
{gDate(1500, time.March, 10), Date{1500, time.February, 29}},
{gDate(1500, time.March, 11), Date{1500, time.March, 1}},
{gDate(1582, time.October, 14), Date{1582, time.October, 4}},
{gDate(1582, time.October, 15), Date{1582, time.October, 5}},
{gDate(1582, time.October, 16), Date{1582, time.October, 6}},
{gDate(1700, time.February, 28), Date{1700, time.February, 18}},
{gDate(1700, time.March, 1), Date{1700, time.February, 19}},
{gDate(1700, time.March, 10), Date{1700, time.February, 28}},
{gDate(1700, time.March, 11), Date{1700, time.February, 29}},
{gDate(1700, time.March, 12), Date{1700, time.March, 1}},
{gDate(1800, time.February, 28), Date{1800, time.February, 17}},
{gDate(1800, time.March, 1), Date{1800, time.February, 18}},
{gDate(1800, time.March, 11), Date{1800, time.February, 28}},
{gDate(1800, time.March, 12), Date{1800, time.February, 29}},
{gDate(1800, time.March, 13), Date{1800, time.March, 1}},
{gDate(1900, time.February, 28), Date{1900, time.February, 16}},
{gDate(1900, time.March, 1), Date{1900, time.February, 17}},
{gDate(1900, time.March, 12), Date{1900, time.February, 28}},
{gDate(1900, time.March, 13), Date{1900, time.February, 29}},
{gDate(1900, time.March, 14), Date{1900, time.March, 1}},
{gDate(2100, time.February, 28), Date{2100, time.February, 15}},
{gDate(2100, time.March, 1), Date{2100, time.February, 16}},
{gDate(2100, time.March, 13), Date{2100, time.February, 28}},
{gDate(2100, time.March, 14), Date{2100, time.February, 29}},
}
for _, tt := range tests {
testname := fmt.Sprintf("%v, %v", tt.gd, tt.want)
t.Run(testname, func(t *testing.T) {
ans := TimeToJDate(tt.gd)
if ans != tt.want {
t.Errorf("got %v, want %v", ans, tt.want)
}