add dynamic register

example/parse_time/parse_next_time.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/rfyiamcool/cronlib"
+)
+
+func main() {
+	t, err := cronlib.Parse("0 0 0 */1 * *")
+	if err != nil {
+		panic(err.Error())
+	}
+
+	fmt.Println(" now: ", time.Now())
+	next := t.Next(time.Now())
+	fmt.Println("next: ", next)
+}
+