diff --git a/README.md b/README.md
index 60803b4..fcda82c 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ This driver allows you to:
 - Read/write the seconds.
 - Read/write the minutes.
 - Read/write the hours in 24h or AM/PM format.
+- Read/write the weekday.
 
 ## The devices
 
diff --git a/src/ds323x/datetime.rs b/src/ds323x/datetime.rs
index 0e25d23..90b1cd9 100644
--- a/src/ds323x/datetime.rs
+++ b/src/ds323x/datetime.rs
@@ -47,6 +47,11 @@ where
         }
     }
 
+    /// Read the day of the week [1-7].
+    pub fn get_weekday(&mut self) -> Result<u8, Error<E>> {
+        self.read_register_decimal(Register::DOW)
+    }
+
     fn read_register_decimal(&mut self, register: u8) -> Result<u8, Error<E>> {
         let data = self.iface.read_register(register)?;
         Ok(packed_bcd_to_decimal(data))
@@ -98,6 +103,16 @@ where
         }
     }
 
+    /// Set the day of week [1-7].
+    ///
+    /// Will return an `Error::InvalidInputData` if the day is out of range.
+    pub fn set_weekday(&mut self, weekday: u8) -> Result<(), Error<E>> {
+        if weekday < 1 || weekday > 7 {
+            return Err(Error::InvalidInputData);
+        }
+        self.iface.write_register(Register::DOW, weekday)
+    }
+
     fn write_register_decimal(&mut self, register: u8, decimal_number: u8) -> Result<(), Error<E>> {
         self.iface.write_register(register, decimal_to_packed_bcd(decimal_number))
     }
@@ -137,7 +152,7 @@ mod tests {
         assert_eq!(21, packed_bcd_to_decimal(0b0010_0001));
         assert_eq!(59, packed_bcd_to_decimal(0b0101_1001));
     }
-    
+
     #[test]
     fn can_convert_decimal_to_packed_bcd() {
         assert_eq!(0b0000_0000, decimal_to_packed_bcd( 0));
diff --git a/src/lib.rs b/src/lib.rs
index e8b4578..56e669e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,7 @@
 //! - Read/write the seconds.
 //! - Read/write the minutes.
 //! - Read/write the hours in 24h or AM/PM format.
+//! - Read/write the weekday.
 //!
 //! ## The devices
 //!
@@ -181,6 +182,7 @@ impl Register {
     const SECONDS   : u8 = 0x00;
     const MINUTES   : u8 = 0x01;
     const HOURS     : u8 = 0x02;
+    const DOW       : u8 = 0x03;
 }
 
 struct BitFlags;
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index ffb9b74..7656b48 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -12,6 +12,7 @@ impl Register {
     pub const SECONDS   : u8 = 0x00;
     pub const MINUTES   : u8 = 0x01;
     pub const HOURS     : u8 = 0x02;
+    pub const DOW       : u8 = 0x03;
 }
 
 pub struct DummyOutputPin;
diff --git a/tests/ds323x.rs b/tests/ds323x.rs
index dfe5cd6..987ff29 100644
--- a/tests/ds323x.rs
+++ b/tests/ds323x.rs
@@ -92,4 +92,9 @@ mod hours_12h_pm {
     set_invalid_param_range_test!(set_hours, Hours::PM(0), Hours::PM(13));
 }
 
-}
\ No newline at end of file
+mod weekday {
+    use super::*;
+    get_param_test!(get_weekday, DOW, 1, 1);
+    set_param_test!(set_weekday, DOW, 1, 1);
+    set_invalid_param_range_test!(set_weekday, 0, 8);
+}