diff --git a/PyFin/Analysis/SecurityValueHolders.pyx b/PyFin/Analysis/SecurityValueHolders.pyx
index 905328c..018c57e 100644
--- a/PyFin/Analysis/SecurityValueHolders.pyx
+++ b/PyFin/Analysis/SecurityValueHolders.pyx
@@ -138,18 +138,34 @@ cdef class SecurityValueHolder(object):
     def __add__(self, right):
         return SecurityAddedValueHolder(self, right)
 
+    def __radd__(self, left):
+        return SecurityAddedValueHolder(left, self)
+
     def __sub__(self, right):
         return SecuritySubbedValueHolder(self, right)
 
+    def __rsub__(self, left):
+        return SecuritySubbedValueHolder(left, self)
+
     def __mul__(self, right):
         return SecurityMultipliedValueHolder(self, right)
 
+    def __rmul__(self, left):
+        return SecurityMultipliedValueHolder(left, self)
+
+
     def __div__(self, right):
         return SecurityDividedValueHolder(self, right)
 
+    def __rdiv__(self, left):
+        return SecurityDividedValueHolder(left, self)
+
     def __truediv__(self, right):
         return SecurityDividedValueHolder(self, right)
 
+    def __rtruediv__(self, left):
+        return SecurityDividedValueHolder(left, self)
+
     def __richcmp__(self, right, int op):
 
         if op == 0:
diff --git a/PyFin/Analysis/SeriesValues.pyx b/PyFin/Analysis/SeriesValues.pyx
index 5b334b1..8d72f2e 100644
--- a/PyFin/Analysis/SeriesValues.pyx
+++ b/PyFin/Analysis/SeriesValues.pyx
@@ -92,6 +92,15 @@ cdef class SeriesValues(object):
         else:
             return SeriesValues(self.values + right, self.name_mapping)
 
+    def __radd__(self, left):
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                return SeriesValues(left.values + self.values, self.name_mapping)
+            else:
+                return SeriesValues(left.values + self, left.name_mapping)
+        else:
+            return SeriesValues(left + self.values, self.name_mapping)
+
     def __sub__(self, right):
         if isinstance(right, SeriesValues):
             if isinstance(self, SeriesValues):
@@ -101,6 +110,15 @@ cdef class SeriesValues(object):
         else:
             return SeriesValues(self.values - right, self.name_mapping)
 
+    def __rsub__(self, left):
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                return SeriesValues(left.values - self.values, self.name_mapping)
+            else:
+                return SeriesValues(left.values - self, left.name_mapping)
+        else:
+            return SeriesValues(left - self.values, self.name_mapping)
+
     def __mul__(self, right):
         if isinstance(right, SeriesValues):
             if isinstance(self, SeriesValues):
@@ -110,6 +128,15 @@ cdef class SeriesValues(object):
         else:
             return SeriesValues(self.values * right, self.name_mapping)
 
+    def __rmul__(self, left):
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                return SeriesValues(left.values * self.values, self.name_mapping)
+            else:
+                return SeriesValues(left.values * self, left.name_mapping)
+        else:
+            return SeriesValues(left * self.values, self.name_mapping)
+
     @cython.cdivision(True)
     def __truediv__(self, right):
         cdef np.ndarray[double, ndim=1] values
@@ -128,6 +155,24 @@ cdef class SeriesValues(object):
         values[~np.isfinite(values)] = NAN
         return SeriesValues(values, name_mapping)
 
+    @cython.cdivision(True)
+    def __rtruediv__(self, left):
+        cdef np.ndarray[double, ndim=1] values
+        cdef dict name_mapping
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                values = left.values / self.values
+                name_mapping = self.name_mapping
+            else:
+                values = left.values / self
+                name_mapping = left.name_mapping
+        else:
+            values = left / self.values
+            name_mapping = self.name_mapping
+
+        values[~np.isfinite(values)] = NAN
+        return SeriesValues(values, name_mapping)
+
     @cython.cdivision(True)
     def __div__(self, right):
         cdef np.ndarray[double, ndim=1] values
@@ -146,6 +191,24 @@ cdef class SeriesValues(object):
         values[~np.isfinite(values)] = NAN
         return SeriesValues(values, name_mapping)
 
+    @cython.cdivision(True)
+    def __rdiv__(self, left):
+        cdef np.ndarray[double, ndim=1] values
+        cdef dict name_mapping
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                values = left.values / self.values
+                name_mapping = self.name_mapping
+            else:
+                values = left.values / self
+                name_mapping = left.name_mapping
+        else:
+            values = left / self.values
+            name_mapping = self.name_mapping
+
+        values[~np.isfinite(values)] = NAN
+        return SeriesValues(values, name_mapping)
+
     def __and__(self, right):
         if isinstance(right, SeriesValues):
             if isinstance(self, SeriesValues):
@@ -155,6 +218,15 @@ cdef class SeriesValues(object):
         else:
             return SeriesValues(self.values.astype(bool) & right, self.name_mapping)
 
+    def __rand__(self, left):
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                return SeriesValues(left.values.astype(bool) & self.values.astype(bool), self.name_mapping)
+            else:
+                return SeriesValues(left.values.astype(bool) & self, left.name_mapping)
+        else:
+            return SeriesValues(left & self.values.astype(bool), self.name_mapping)
+
     def __or__(self, right):
         if isinstance(right, SeriesValues):
             if isinstance(self, SeriesValues):
@@ -164,6 +236,15 @@ cdef class SeriesValues(object):
         else:
             return SeriesValues(self.values.astype(bool) | right, self.name_mapping)
 
+    def __ror__(self, left):
+        if isinstance(left, SeriesValues):
+            if isinstance(self, SeriesValues):
+                return SeriesValues(left.values.astype(bool) | self.values.astype(bool), self.name_mapping)
+            else:
+                return SeriesValues(left.values.astype(bool) | self, left.name_mapping)
+        else:
+            return SeriesValues(left | self.values.astype(bool), self.name_mapping)
+
     def __xor__(self, right):
         if isinstance(right, SeriesValues):
             if isinstance(self, SeriesValues):
@@ -231,7 +312,7 @@ cdef class SeriesValues(object):
                 start = diff_loc + 1
             data[isnan(self.values)] = NAN
         else:
-            data = rankdata(self.values).astype(float)
+            data = rankdata(self.values, nan_policy="omit").astype(float)
             data[isnan(self.values)] = NAN
         return SeriesValues(data, self.name_mapping)
 
diff --git a/PyFin/DateUtilities/Calendar.pyx b/PyFin/DateUtilities/Calendar.pyx
index 056ed59..3a38307 100644
--- a/PyFin/DateUtilities/Calendar.pyx
+++ b/PyFin/DateUtilities/Calendar.pyx
@@ -709,7 +709,45 @@ cdef set sse_holDays = {
     Date(2022, 10, 4),
     Date(2022, 10, 5),
     Date(2022, 10, 6),
-    Date(2022, 10, 7)
+    Date(2022, 10, 7),
+    Date(2023, 1, 2),
+    Date(2023, 1, 23),
+    Date(2023, 1, 24),
+    Date(2023, 1, 25),
+    Date(2023, 1, 26),
+    Date(2023, 1, 27),
+    Date(2023, 4, 5),
+    Date(2023, 5, 1),
+    Date(2023, 5, 2),
+    Date(2023, 5, 3),
+    Date(2023, 6, 22),
+    Date(2023, 6, 23),
+    Date(2023, 9, 29),
+    Date(2023, 10, 2),
+    Date(2023, 10, 3),
+    Date(2023, 10, 4),
+    Date(2023, 10, 5),
+    Date(2023, 10, 6),
+    Date(2024, 1, 1),
+    Date(2024, 2, 9),
+    Date(2024, 2, 12),
+    Date(2024, 2, 13),
+    Date(2024, 2, 14),
+    Date(2024, 2, 15),
+    Date(2024, 2, 16),
+    Date(2024, 4, 4),
+    Date(2024, 4, 5),
+    Date(2024, 5, 1),
+    Date(2024, 5, 2),
+    Date(2024, 5, 3),
+    Date(2024, 6, 10),
+    Date(2024, 9, 16),
+    Date(2024, 9, 17),
+    Date(2024, 10, 1),
+    Date(2024, 10, 2),
+    Date(2024, 10, 3),
+    Date(2024, 10, 4),
+    Date(2024, 10, 7),
 }
 
 
@@ -873,7 +911,25 @@ cdef set ib_working_weekends = {
     Date(2022, 4, 24),
     Date(2022, 5, 7),
     Date(2022, 10, 8),
-    Date(2022, 10, 9)
+    Date(2022, 10, 9),
+    # 2023
+    Date(2023, 1, 28),
+    Date(2023, 1, 29),
+    Date(2023, 4, 23),
+    Date(2023, 5, 6),
+    Date(2023, 6, 25),
+    Date(2023, 10, 7),
+    Date(2023, 10, 8),
+    # 2024
+    Date(2024, 2, 4),
+    Date(2024, 2, 9),
+    Date(2024, 2, 18),
+    Date(2024, 4, 7),
+    Date(2024, 4, 28),
+    Date(2024, 5, 11),
+    Date(2024, 9, 14),
+    Date(2024, 9, 29),
+    Date(2024, 10, 12)
 }
 
 cdef ChinaSseImpl _sseImpl = ChinaSseImpl()
diff --git a/PyFin/Math/Accumulators/IAccumulators.pyx b/PyFin/Math/Accumulators/IAccumulators.pyx
index 10890ef..1c944a3 100644
--- a/PyFin/Math/Accumulators/IAccumulators.pyx
+++ b/PyFin/Math/Accumulators/IAccumulators.pyx
@@ -36,19 +36,34 @@ cdef class IAccumulator(object):
     def __add__(self, right):
         return AddedValueHolder(self, right)
 
+    def __radd__(self, left):
+        return AddedValueHolder(left, self)
+
     def __sub__(self, right):
         return MinusedValueHolder(self, right)
 
+    def __rsub__(self, left):
+        return MinusedValueHolder(left, self)
+
     def __mul__(self, right):
         return MultipliedValueHolder(self, right)
 
+    def __rmul__(self, left):
+        return MultipliedValueHolder(left, self)
+
     def __div__(self, right):
         return DividedValueHolder(self, right)
 
+    def __rdiv__(self, left):
+        return DividedValueHolder(left, self)
+
     # only work for python 3
     def __truediv__(self, right):
         return DividedValueHolder(self, right)
 
+    def __rtruediv__(self, left):
+        return DividedValueHolder(left, self)
+
     def __richcmp__(self, right, int op):
         if op == 0:
             return LtOperatorValueHolder(self, right)
diff --git a/PyFin/__init__.py b/PyFin/__init__.py
index a60eebf..07db660 100644
--- a/PyFin/__init__.py
+++ b/PyFin/__init__.py
@@ -23,4 +23,4 @@
            'Analysis',
            'Utilities']
 
-__version__ = "0.9.8"
+__version__ = "0.9.10"
diff --git a/PyFin/tests/DateUtilities/testCalendar.py b/PyFin/tests/DateUtilities/testCalendar.py
index e3993c4..e4f9448 100644
--- a/PyFin/tests/DateUtilities/testCalendar.py
+++ b/PyFin/tests/DateUtilities/testCalendar.py
@@ -140,7 +140,23 @@ def testChinaSSE(self):
                        Date(2022, 5, 2), Date(2022, 5, 3), Date(2022, 5, 4),
                        Date(2022, 6, 3),
                        Date(2022, 9, 12),
-                       Date(2022, 10, 3), Date(2022, 10, 4), Date(2022, 10, 5), Date(2022, 10, 6), Date(2022, 10, 7)
+                       Date(2022, 10, 3), Date(2022, 10, 4), Date(2022, 10, 5), Date(2022, 10, 6), Date(2022, 10, 7),
+                       # China Shanghai Securities Exchange holiday list in the year 2023
+                       Date(2023, 1, 1), Date(2023, 1, 2),
+                       Date(2023, 1, 21), Date(2023, 1, 22), Date(2023, 1, 23), Date(2023, 1, 24), Date(2023, 1, 25), Date(2023, 1, 26), Date(2023, 1, 27),
+                       Date(2023, 4, 5), Date(2023, 4, 29), Date(2023, 4, 30),
+                       Date(2023, 5, 1), Date(2023, 5, 2), Date(2023, 5, 3),
+                       Date(2023, 6, 22), Date(2023, 6, 23), Date(2023, 6, 24),
+                       Date(2023, 9, 29), Date(2023, 9, 30),
+                       Date(2023, 10, 1), Date(2023, 10, 2), Date(2023, 10, 3), Date(2023, 10, 4), Date(2023, 10, 5), Date(2023, 10, 6),
+                       # China Shanghai Securities Exchange holiday list in the year 2024
+                       Date(2024, 1, 1),
+                       Date(2024, 2, 10), Date(2024, 2, 11), Date(2024, 2, 12), Date(2024, 2, 13), Date(2024, 2, 14), Date(2024, 2, 15), Date(2024, 2, 16), Date(2024, 2, 17),
+                       Date(2024, 4, 5), Date(2024, 4, 6), Date(2024, 4, 7),
+                       Date(2024, 5, 1), Date(2024, 5, 2), Date(2024, 5, 3), Date(2024, 5, 4), Date(2024, 5, 5),
+                       Date(2024, 6, 10),
+                       Date(2024, 9, 15), Date(2024, 9, 16), Date(2024, 9, 17),
+                       Date(2024, 10, 1), Date(2024, 10, 2), Date(2024, 10, 3), Date(2024, 10, 4), Date(2024, 10, 5), Date(2024, 10, 6), Date(2024, 10, 7),
                        ]
 
         cal = Calendar('China.SSE')
@@ -213,7 +229,26 @@ def testChinaIB(self):
                                   Date(2022, 4, 24),
                                   Date(2022, 5, 7),
                                   Date(2022, 10, 8),
-                                  Date(2022, 10, 9)]
+                                  Date(2022, 10, 9),
+                                  # China Inter Bank working weekend list in the year 2023
+                                  Date(2023, 1, 28),
+                                  Date(2023, 1, 29),
+                                  Date(2023, 4, 23),
+                                  Date(2023, 5, 6),
+                                  Date(2023, 6, 25),
+                                  Date(2023, 10, 7),
+                                  Date(2023, 10, 8),
+                                  # China Inter Bank working weekend list in the year 2024
+                                  Date(2024, 2, 4),
+                                  Date(2024, 2, 9),
+                                  Date(2024, 2, 18),
+                                  Date(2024, 4, 7),
+                                  Date(2024, 4, 28),
+                                  Date(2024, 5, 11),
+                                  Date(2024, 9, 14),
+                                  Date(2024, 9, 29),
+                                  Date(2024, 10, 12)
+                                  ]
 
         cal = Calendar('China.IB')
 
diff --git a/setup.py b/setup.py
index 8273b21..ad1a25f 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
 
 PACKAGE = "PyFin"
 NAME = "Finance-Python"
-__version__ = "0.9.8"
+__version__ = "0.9.10"
 DESCRIPTION = "PyFin " + __version__
 AUTHOR = "cheng li"
 AUTHOR_EMAIL = "wegamekinglc@hotmail.com"