Refactoring and update README.md

README.md

@@ -223,6 +223,50 @@ Year 2021 is 辛丑
 Day 2021-07-28 is 丁丑
 ```
 
+### ユリウス日
+
+```go
+//go:build run
+// +build run
+
+package main
+
+import (
+    "flag"
+    "fmt"
+    "os"
+
+    "github.com/goark/koyomi"
+    "github.com/goark/koyomi/jdn"
+)
+
+func main() {
+    flag.Parse()
+    args := flag.Args()
+    if len(args) < 1 {
+        fmt.Fprintln(os.Stderr, os.ErrInvalid)
+        return
+    }
+    for _, s := range args {
+        t, err := koyomi.DateFrom(s)
+        if err != nil {
+            fmt.Fprintln(os.Stderr, err)
+            continue
+        }
+        j := jdn.GetJDN(t.Time)
+        fmt.Printf("Julian Day Number of %v is %v\n", t.Format("2006-01-02"), j)
+    }
+}
+```
+
+これを実行すると以下のような結果になります。
+
+```
+$ go run sample/sample4.go 2022-01-01
+$ go run sample/sample4.go 2022-01-01
+Julian Day Number of 2022-01-01 is 2459580
+```
+
 ## Modules Requirement Graph
 
 [![dependency.png](./dependency.png)](./dependency.png)

jdn/jdn.go

@@ -16,7 +16,7 @@ func GetJD(dt time.Time) *big.Rat {
 	jdn = addRat(jdn, floorRat(mulRat(addInt(mulInt(k, 12), m-2), fracInt(367, 12))))
 	jdn = subRat(jdn, floorRat(mulRat(floorRat(quoInt(addInt(subRat(y, k), 4900), 100)), fracInt(3, 4))))
 	jdn = addInt(jdn, d-32075)
-	jdn = addRat(jdn, subRat(quoInt(intRat(int64(dt.Second()+dt.Minute()*60+dt.Hour()*3600)), 60*60*24), floatRat(0.5)))
+	jdn = addRat(jdn, subRat(quoRat(addRat(intRat(int64(dt.Second()+dt.Minute()*60+dt.Hour()*3600)), fracInt(int64(dt.Nanosecond()), 999999999)), floatRat((24*time.Hour).Seconds())), floatRat(0.5)))
 	return jdn
 }
 

jdn/jdn_test.go

@@ -4,11 +4,10 @@ import (
 	"math/big"
 	"testing"
 	"time"
-
-	"github.com/goark/koyomi"
 )
 
 func TestGetJDN(t *testing.T) {
+	jst := time.FixedZone("JST", int((9 * time.Hour).Seconds())) // Japan standard Time
 	testCases := []struct {
 		inp   time.Time
 		outp1 *big.Rat
@@ -17,7 +16,7 @@ func TestGetJDN(t *testing.T) {
 		outp4 int64
 	}{
 		{inp: time.Date(2015, time.January, 1, 0, 0, 0, 0, time.UTC), outp1: floatRat(2457023.5), outp2: 2457023, outp3: floatRat(57023.0), outp4: 57023},
-		{inp: time.Date(2022, time.January, 1, 0, 0, 0, 0, koyomi.JST), outp1: floatRat(2459580.125), outp2: 2459580, outp3: floatRat(59579.625), outp4: 59579},
+		{inp: time.Date(2022, time.January, 1, 0, 0, 0, 0, jst), outp1: floatRat(2459580.125), outp2: 2459580, outp3: floatRat(59579.625), outp4: 59579},
 	}
 	for _, tc := range testCases {
 		jd := GetJD(tc.inp)

sample/sample4.go

@@ -0,0 +1,46 @@
+//go:build run
+// +build run
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/goark/koyomi"
+	"github.com/goark/koyomi/jdn"
+)
+
+func main() {
+	flag.Parse()
+	args := flag.Args()
+	if len(args) < 1 {
+		fmt.Fprintln(os.Stderr, os.ErrInvalid)
+		return
+	}
+	for _, s := range args {
+		t, err := koyomi.DateFrom(s)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			continue
+		}
+		j := jdn.GetJDN(t.Time)
+		fmt.Printf("Julian Day Number of %v is %v\n", t.Format("2006-01-02"), j)
+	}
+}
+
+/* Copyright 2022 Spiegel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */