diff --git a/docs/ESP32_clock_adjust.xlsx b/docs/ESP32_clock_adjust.xlsx
new file mode 100644
index 0000000..95f0f0c
Binary files /dev/null and b/docs/ESP32_clock_adjust.xlsx differ
diff --git a/lib/RTC/PCF85063_Driver.cpp b/lib/RTC/PCF85063_Driver.cpp
index e8efc79..36422c3 100644
--- a/lib/RTC/PCF85063_Driver.cpp
+++ b/lib/RTC/PCF85063_Driver.cpp
@@ -17,6 +17,9 @@ namespace drivers
             const uint8_t def_conf2 = RTC_CTRL_2_DEFAULT | RTC_CTRL_2_MI; // enable 1 minute interrupt
             success &= m_i2c.write(m_address, RTC_CTRL_2_ADDR, {def_conf2});
         }
+        // set clock correction pulses
+        const uint8_t correction = 0b10000011; // fast mode +3 correction pulses, because clock is beyond
+        success &= m_i2c.write(m_address, RTC_OFFSET_ADDR, {correction});
         if (!success)
             LOG_ERROR("RTC Init Failure");
     }
@@ -182,16 +185,17 @@ namespace drivers
     {
         tm dtime = datetime2tm(datetime);
         const std::string buf(std::asctime(&dtime));
-        return buf.substr(0, std::min(buf.find('\n'),buf.find('\r')));
+        return buf.substr(0, std::min(buf.find('\n'), buf.find('\r')));
     }
 
     const std::string PCF85063::tm2str(const std::tm &datetime)
     {
         const std::string buf(std::asctime(&datetime));
-        return buf.substr(0, std::min(buf.find('\n'),buf.find('\r')));
+        return buf.substr(0, std::min(buf.find('\n'), buf.find('\r')));
     }
 
-    const std::tm PCF85063::datetime2tm(const datetime_t& datetime) {
+    const std::tm PCF85063::datetime2tm(const datetime_t &datetime)
+    {
         tm dtime;
         dtime.tm_sec = datetime.second;
         dtime.tm_min = datetime.minute;