diff --git a/RTClib.cpp b/RTClib.cpp
index 46caf4aa..393e1fb4 100644
--- a/RTClib.cpp
+++ b/RTClib.cpp
@@ -137,7 +137,7 @@ static uint8_t conv2d(const char* p) {
 DateTime::DateTime (const char* date, const char* time) {
     // sample input: date = "Dec 26 2009", time = "12:34:56"
     yOff = conv2d(date + 9);
-    // Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 
+    // Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
     switch (date[0]) {
         case 'J': m = (date[1] == 'a') ? 1 : ((date[2] == 'n') ? 6 : 7); break;
         case 'F': m = 2; break;
@@ -180,7 +180,7 @@ DateTime::DateTime (const __FlashStringHelper* date, const __FlashStringHelper*
     ss = conv2d(buff + 6);
 }
 
-uint8_t DateTime::dayOfTheWeek() const {    
+uint8_t DateTime::dayOfTheWeek() const {
     uint16_t day = date2days(yOff, m, d);
     return (day + 6) % 7; // Jan 1, 2000 is a Saturday, i.e. returns 6
 }
@@ -213,6 +213,14 @@ TimeSpan DateTime::operator-(const DateTime& right) {
   return TimeSpan(unixtime()-right.unixtime());
 }
 
+bool DateTime::operator<(const DateTime& right) const {
+  return unixtime() < right.unixtime();
+}
+
+bool DateTime::operator==(const DateTime& right) const {
+  return unixtime() == right.unixtime();
+}
+
 //ISO 8601 Timestamp
 String DateTime::timestamp(timestampOpt opt){
   char buffer[20];
@@ -234,7 +242,6 @@ String DateTime::timestamp(timestampOpt opt){
   return String(buffer);
 }
 
-
 ////////////////////////////////////////////////////////////////////////////////
 // TimeSpan implementation
 
@@ -294,7 +301,7 @@ void RTC_DS1307::adjust(const DateTime& dt) {
 
 DateTime RTC_DS1307::now() {
   Wire.beginTransmission(DS1307_ADDRESS);
-  Wire._I2C_WRITE((byte)0);	
+  Wire._I2C_WRITE((byte)0);
   Wire.endTransmission();
 
   Wire.requestFrom(DS1307_ADDRESS, 7);
@@ -305,7 +312,7 @@ DateTime RTC_DS1307::now() {
   uint8_t d = bcd2bin(Wire._I2C_READ());
   uint8_t m = bcd2bin(Wire._I2C_READ());
   uint16_t y = bcd2bin(Wire._I2C_READ()) + 2000;
-  
+
   return DateTime (y, m, d, hh, mm, ss);
 }
 
@@ -315,7 +322,7 @@ Ds1307SqwPinMode RTC_DS1307::readSqwPinMode() {
   Wire.beginTransmission(DS1307_ADDRESS);
   Wire._I2C_WRITE(DS1307_CONTROL);
   Wire.endTransmission();
-  
+
   Wire.requestFrom((uint8_t)DS1307_ADDRESS, (uint8_t)1);
   mode = Wire._I2C_READ();
 
@@ -335,7 +342,7 @@ void RTC_DS1307::readnvram(uint8_t* buf, uint8_t size, uint8_t address) {
   Wire.beginTransmission(DS1307_ADDRESS);
   Wire._I2C_WRITE(addrByte);
   Wire.endTransmission();
-  
+
   Wire.requestFrom((uint8_t) DS1307_ADDRESS, size);
   for (uint8_t pos = 0; pos < size; ++pos) {
     buf[pos] = Wire._I2C_READ();
@@ -454,7 +461,7 @@ void RTC_PCF8523::adjust(const DateTime& dt) {
 
 DateTime RTC_PCF8523::now() {
   Wire.beginTransmission(PCF8523_ADDRESS);
-  Wire._I2C_WRITE((byte)3);	
+  Wire._I2C_WRITE((byte)3);
   Wire.endTransmission();
 
   Wire.requestFrom(PCF8523_ADDRESS, 7);
@@ -465,7 +472,7 @@ DateTime RTC_PCF8523::now() {
   Wire._I2C_READ();  // skip 'weekdays'
   uint8_t m = bcd2bin(Wire._I2C_READ());
   uint16_t y = bcd2bin(Wire._I2C_READ()) + 2000;
-  
+
   return DateTime (y, m, d, hh, mm, ss);
 }
 
@@ -475,7 +482,7 @@ Pcf8523SqwPinMode RTC_PCF8523::readSqwPinMode() {
   Wire.beginTransmission(PCF8523_ADDRESS);
   Wire._I2C_WRITE(PCF8523_CLKOUTCONTROL);
   Wire.endTransmission();
-  
+
   Wire.requestFrom((uint8_t)PCF8523_ADDRESS, (uint8_t)1);
   mode = Wire._I2C_READ();
 
@@ -535,7 +542,7 @@ void RTC_DS3231::adjust(const DateTime& dt) {
 
 DateTime RTC_DS3231::now() {
   Wire.beginTransmission(DS3231_ADDRESS);
-  Wire._I2C_WRITE((byte)0);	
+  Wire._I2C_WRITE((byte)0);
   Wire.endTransmission();
 
   Wire.requestFrom(DS3231_ADDRESS, 7);
@@ -546,7 +553,7 @@ DateTime RTC_DS3231::now() {
   uint8_t d = bcd2bin(Wire._I2C_READ());
   uint8_t m = bcd2bin(Wire._I2C_READ());
   uint16_t y = bcd2bin(Wire._I2C_READ()) + 2000;
-  
+
   return DateTime (y, m, d, hh, mm, ss);
 }
 
@@ -556,7 +563,7 @@ Ds3231SqwPinMode RTC_DS3231::readSqwPinMode() {
   Wire.beginTransmission(DS3231_ADDRESS);
   Wire._I2C_WRITE(DS3231_CONTROL);
   Wire.endTransmission();
-  
+
   Wire.requestFrom((uint8_t)DS3231_ADDRESS, (uint8_t)1);
   mode = Wire._I2C_READ();
 
@@ -575,7 +582,7 @@ void RTC_DS3231::writeSqwPinMode(Ds3231SqwPinMode mode) {
     ctrl |= 0x04; // turn on INTCN
   } else {
     ctrl |= mode;
-  } 
+  }
   write_i2c_register(DS3231_ADDRESS, DS3231_CONTROL, ctrl);
 
   //Serial.println( read_i2c_register(DS3231_ADDRESS, DS3231_CONTROL), HEX);
@@ -587,11 +594,11 @@ float RTC_DS3231::getTemperature()
   Wire.beginTransmission(DS3231_ADDRESS);
   Wire._I2C_WRITE(DS3231_TEMPERATUREREG);
   Wire.endTransmission();
-  
+
   Wire.requestFrom(DS3231_ADDRESS, 2);
   msb = Wire._I2C_READ();
   lsb = Wire._I2C_READ();
-  
+
 //  Serial.print("msb=");
 //  Serial.print(msb,HEX);
 //  Serial.print(", lsb=");
diff --git a/RTClib.h b/RTClib.h
index e59f3d1b..efad38bc 100644
--- a/RTClib.h
+++ b/RTClib.h
@@ -59,6 +59,12 @@ class DateTime {
     DateTime operator+(const TimeSpan& span);
     DateTime operator-(const TimeSpan& span);
     TimeSpan operator-(const DateTime& right);
+    bool operator<(const DateTime& right) const;
+    bool operator>(const DateTime& right) const  { return right < *this; }
+    bool operator<=(const DateTime& right) const { return !(*this > right); }
+    bool operator>=(const DateTime& right) const { return !(*this < right); }
+    bool operator==(const DateTime& right) const;
+    bool operator!=(const DateTime& right) const { return !(*this == right); }
 
 protected:
     uint8_t yOff, m, d, hh, mm, ss;