Added Date and Time Seperated from T and Z

NTPClient.cpp

@@ -207,4 +207,28 @@ void NTPClient::sendNTPPacket() {
 void NTPClient::setRandomPort(unsigned int minValue, unsigned int maxValue) {
   randomSeed(analogRead(0));
   this->_port = random(minValue, maxValue);
-}
+}
+String NTPClient::getFormattedDate() {
+  unsigned long rawTime = this->getEpochTime() / 86400L;  // in days
+  unsigned long days = 0, year = 1970;
+  uint8_t month;
+  static const uint8_t monthDays[]={31,28,31,30,31,30,31,31,30,31,30,31};
+
+  while((days += (LEAP_YEAR(year) ? 366 : 365)) <= rawTime)
+    year++;
+  rawTime -= days - (LEAP_YEAR(year) ? 366 : 365); // now it is days in this year, starting at 0
+  days=0;
+  for (month=0; month<12; month++) {
+    uint8_t monthLength;
+    if (month==1) { // february
+      monthLength = LEAP_YEAR(year) ? 29 : 28;
+    } else {
+      monthLength = monthDays[month];
+    }
+    if (rawTime < monthLength) break;
+    rawTime -= monthLength;
+  }
+  String monthStr = ++month < 10 ? "0" + String(month) : String(month); // jan is month 1  
+  String dayStr = ++rawTime < 10 ? "0" + String(rawTime) : String(rawTime); // day of month  
+  return String(year) + "-" + monthStr + "-" + dayStr + "T" + this->getFormattedTime(secs ? secs : 0) + "Z";
+}

NTPClient.h

@@ -94,6 +94,11 @@ class NTPClient {
      * @return time formatted like `hh:mm:ss`
      */
     String getFormattedTime() const;
+
+    /**
+     * @return date and time seperated by T and Z obtained from the epoch time
+     */
+    String getFormattedDate();
 
     /**
      * @return time in seconds since Jan. 1, 1970