diff --git a/README.md b/README.md
index 5960e8a..ffa5a76 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ This library was based on the master branch of [NorthernWidget/DS3231](https://g
 * using standardized functions of the `time.h` library.
 * introduce a `struct tm` which holds all relevant date and time values.
 * restrucure comments, so that syntax highlighting works fine.
-* add a `show_DateTime()` function with can be used to print a user specific(self defined) DateTime string easily.
+* add a `strf_DateTime()` function with can be used to print a user specific(self defined) DateTime string easily.
 
 ## Contents
 
@@ -275,7 +275,7 @@ further lists the DateTime class methods (for Documentation look into the src fi
 - getWeekDay()
 - getYearDay()
 - getDST()
-- show_DateTime()
+- strf_DateTime()
 - getUnixTime()
 - getY2KTime()
 
diff --git a/examples/DateTime_Contructor_Test/DateTime_Contructor_Test.ino b/examples/DateTime_Contructor_Test/DateTime_Contructor_Test.ino
index 1b214a5..dc260c6 100644
--- a/examples/DateTime_Contructor_Test/DateTime_Contructor_Test.ino
+++ b/examples/DateTime_Contructor_Test/DateTime_Contructor_Test.ino
@@ -122,9 +122,9 @@ void setup () {
     Serial.print("\n\nPrint Data via function <showTimeFormated> of Struct tm:\n\t");
     showTimeFormated(tstmp);
 
-    Serial.print("\nPrint Data via DataTime function <show_DateTime>:\n\t");
+    Serial.print("\nPrint Data via DataTime function <strf_DateTime>:\n\t");
     char buffer[80];
-    datetime.show_DateTime(buffer, sizeof(buffer));
+    datetime.strf_DateTime(buffer, sizeof(buffer));
     Serial.println(buffer);
 
     //Serial.print("\nPrint __DATE__ and __TIME__:\n");
diff --git a/examples/setEpoch/setEpoch.ino b/examples/setEpoch/setEpoch.ino
index 8eb2da3..915146f 100644
--- a/examples/setEpoch/setEpoch.ino
+++ b/examples/setEpoch/setEpoch.ino
@@ -109,10 +109,10 @@ void setup () {
     showTimeFormated(tstmp);
 
     // Use smart print function from DateTime class
-    Serial.print("\nUse show_DateTime function:\n ");
+    Serial.print("\nUse strf_DateTime function:\n ");
     // provide a buffer
     char buffer[80];
-    datetime.show_DateTime(buffer, sizeof(buffer));
+    datetime.strf_DateTime(buffer, sizeof(buffer));
     Serial.println(buffer);
 }
 
diff --git a/keywords.txt b/keywords.txt
index 8097202..cdacdb7 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -9,6 +9,7 @@ DateTime        KEYWORD1
 now             KEYWORD2
 getY2kTime      KEYWORD2
 getUnixTime     KEYWORD2
+strf_DateTime   KEYWORD2
 getWeekDay      KEYWORD2
 getDST          KEYWORD2
 getSecond       KEYWORD2
diff --git a/src/DS3231-RTC.cpp b/src/DS3231-RTC.cpp
index 29bc062..bd01020 100644
--- a/src/DS3231-RTC.cpp
+++ b/src/DS3231-RTC.cpp
@@ -142,15 +142,17 @@ void DateTime::set_timstamps() {
 }
 
 /**
- * @brief smart time print function based on the standard strftime function
- * see: https://en.cppreference.com/w/cpp/chrono/c/strftime
+ * @brief function to format a DateTime string in an buffer based on the standard strftime function
+ * 
+ *  see: https://cplusplus.com/reference/ctime/strftime/ 
+ *  or:  https://en.cppreference.com/w/cpp/chrono/c/strftime
  * 
  * @param buffer buffer for time string 
  * @param buffersize size of buffer
  * @param formatSpec define format see strftime
  * @return size_t lenth of used buffer
  */
-size_t DateTime::show_DateTime(char *buffer, size_t buffersize, const char *formatSpec) {
+size_t DateTime::strf_DateTime(char *buffer, size_t buffersize, const char *formatSpec) {
    size_t len {strftime(buffer, buffersize, formatSpec, &_tm)};
    return len;
 }
diff --git a/src/DS3231-RTC.h b/src/DS3231-RTC.h
index 946a3f1..8f0fd77 100644
--- a/src/DS3231-RTC.h
+++ b/src/DS3231-RTC.h
@@ -48,7 +48,7 @@ class DateTime {
         int8_t getWeekDay() const	{ return _tm.tm_wday; }
         int16_t getYearDay() const	{ return _tm.tm_yday; }
         int16_t getDST()    const   { return _tm.tm_isdst; }
-        size_t show_DateTime(char *buffer, size_t buffersize, const char *formatSpec = "%a %h %d %T %Y");
+        size_t strf_DateTime(char *buffer, size_t buffersize, const char *formatSpec = "%a %h %d %T %Y");
 
         // time_t value as seconds since 1/1/2000
         time_t getY2kTime() const { return _y2k_timestamp; }