diff --git a/library.properties b/library.properties
index 121ff76..3dff520 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Timezone
-version=1.2.0
+version=1.2.1
 author=Jack Christensen <jack.christensen@outlook.com>
 maintainer=Jack Christensen <jack.christensen@outlook.com>
 sentence=Arduino library to facilitate time zone conversions and automatic daylight saving (summer) time adjustments.
diff --git a/src/Timezone.cpp b/src/Timezone.cpp
index 77b291d..fbf4fdf 100644
--- a/src/Timezone.cpp
+++ b/src/Timezone.cpp
@@ -16,14 +16,20 @@
  * Create a Timezone object from the given time change rules.           *
  *----------------------------------------------------------------------*/
 Timezone::Timezone(TimeChangeRule dstStart, TimeChangeRule stdStart)
-    : m_dst(dstStart), m_std(stdStart), m_dstUTC(0), m_stdUTC(0), m_dstLoc(0), m_stdLoc(0) {}
+    : m_dst(dstStart), m_std(stdStart)
+{
+        initTimeChanges();
+}
 
 /*----------------------------------------------------------------------*
  * Create a Timezone object for a zone that does not observe            *
  * daylight time.                                                       *
  *----------------------------------------------------------------------*/
 Timezone::Timezone(TimeChangeRule stdTime)
-    : m_dst(stdTime), m_std(stdTime), m_dstUTC(0), m_stdUTC(0), m_dstLoc(0), m_stdLoc(0) {}
+    : m_dst(stdTime), m_std(stdTime)
+{
+        initTimeChanges();
+}
 
 #ifdef __AVR__
 /*----------------------------------------------------------------------*
@@ -154,6 +160,17 @@ void Timezone::calcTimeChanges(int yr)
     m_stdUTC = m_stdLoc - m_dst.offset * SECS_PER_MIN;
 }
 
+/*----------------------------------------------------------------------*
+ * Initialize the DST and standard time change points.                  *
+ *----------------------------------------------------------------------*/
+void Timezone::initTimeChanges()
+{
+    m_dstLoc = 0;
+    m_stdLoc = 0;
+    m_dstUTC = 0;
+    m_stdUTC = 0;
+}
+
 /*----------------------------------------------------------------------*
  * Convert the given time change rule to a time_t value                 *
  * for the given year.                                                  *
@@ -196,10 +213,7 @@ void Timezone::setRules(TimeChangeRule dstStart, TimeChangeRule stdStart)
 {
     m_dst = dstStart;
     m_std = stdStart;
-    m_dstUTC = 0;   // force calcTimeChanges() at next conversion call
-    m_stdUTC = 0;
-    m_dstLoc = 0;
-    m_stdLoc = 0;
+    initTimeChanges();  // force calcTimeChanges() at next conversion call
 }
 
 #ifdef __AVR__
@@ -212,10 +226,7 @@ void Timezone::readRules(int address)
     eeprom_read_block((void *) &m_dst, (void *) address, sizeof(m_dst));
     address += sizeof(m_dst);
     eeprom_read_block((void *) &m_std, (void *) address, sizeof(m_std));
-    m_dstUTC = 0;   // force calcTimeChanges() at next conversion call
-    m_stdUTC = 0;
-    m_dstLoc = 0;
-    m_stdLoc = 0;
+    initTimeChanges();  // force calcTimeChanges() at next conversion call
 }
 
 /*----------------------------------------------------------------------*
diff --git a/src/Timezone.h b/src/Timezone.h
index 337516e..8d353ec 100644
--- a/src/Timezone.h
+++ b/src/Timezone.h
@@ -49,6 +49,7 @@ class Timezone
 
     private:
         void calcTimeChanges(int yr);
+        void initTimeChanges();
         time_t toTime_t(TimeChangeRule r, int yr);
         TimeChangeRule m_dst;   // rule for start of dst or summer time for any year
         TimeChangeRule m_std;   // rule for start of standard time for any year