diff --git a/src/ds323x/datetime.rs b/src/ds323x/datetime.rs
index 41fd610..3abfc84 100644
--- a/src/ds323x/datetime.rs
+++ b/src/ds323x/datetime.rs
@@ -36,7 +36,7 @@ where
     }
 
     fn set_datetime(&mut self, datetime: &NaiveDateTime) -> Result<(), Self::Error> {
-        if datetime.year() < 2000 || datetime.year() > 2100 {
+        if !(2000..=2199).contains(&datetime.year()) {
             return Err(Error::InvalidInputData);
         }
         let (month, year) = month_year_to_registers(datetime.month() as u8, datetime.year() as u16);
@@ -174,7 +174,7 @@ where
     }
 
     fn set_year(&mut self, year: u16) -> Result<(), Self::Error> {
-        if !(2000..=2100).contains(&year) {
+        if !(2000..=2199).contains(&year) {
             return Err(Error::InvalidInputData);
         }
         let data = self.iface.read_register(Register::MONTH)?;
@@ -197,7 +197,7 @@ where
     }
 
     fn set_date(&mut self, date: &rtcc::NaiveDate) -> Result<(), Self::Error> {
-        if date.year() < 2000 || date.year() > 2100 {
+        if !(2000..=2199).contains(&date.year()) {
             return Err(Error::InvalidInputData);
         }
         let (month, year) = month_year_to_registers(date.month() as u8, date.year() as u16);
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index a460710..a1ff32c 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -57,21 +57,6 @@ impl BitFlags {
     pub const WEEKDAY: u8 = 0b0100_0000;
 }
 
-pub struct DummyOutputPin;
-
-impl embedded_hal::digital::OutputPin for DummyOutputPin {
-    fn set_low(&mut self) -> Result<(), Self::Error> {
-        Ok(())
-    }
-    fn set_high(&mut self) -> Result<(), Self::Error> {
-        Ok(())
-    }
-}
-
-impl embedded_hal::digital::ErrorType for DummyOutputPin {
-    type Error = embedded_hal::digital::ErrorKind;
-}
-
 pub fn new_ds3231(
     transactions: &[I2cTrans],
 ) -> Ds323x<interface::I2cInterface<I2cMock>, ic::DS3231> {