diff --git a/main.py b/main.py
index ed5faff..0d4addc 100644
--- a/main.py
+++ b/main.py
@@ -1,8 +1,9 @@
 import serial
+import datetime
 
 from metawatch.watch import Watch
 
 w = Watch(serial.Serial('/dev/rfcomm0'))
 print(w.get_device_type())
+w.set_rtc(datetime.datetime.now())
 print(w.get_rtc())
-
diff --git a/metawatch/protocol.py b/metawatch/protocol.py
index c0b50bd..b79d7e8 100644
--- a/metawatch/protocol.py
+++ b/metawatch/protocol.py
@@ -63,6 +63,20 @@ class GetRTC(OutboundPacket):
     def __init__(self):
         self._generate(0x27, 0)
 
+class SetRTC(OutboundPacket):
+    def __init__(self, dt):
+        payload = []
+        payload.append(dt.year & 0xFF)
+        payload.append(dt.year >> 8)
+        payload.append(dt.month)
+        payload.append(dt.day)
+        payload.append(dt.weekday() + 1)
+        payload.append(dt.hour)
+        payload.append(dt.minute)
+        payload.append(dt.second)
+        self._generate(0x26, 0, *payload)
+
+
 class PacketDecodeError(Exception):
     pass
 
@@ -94,10 +108,10 @@ class GetRTCResponse(TypedInboundPacket):
     def parse(self):
         self._assert_type(0x28)
         self._assert_payload_length(8)
-        year = (self._payload[1] << 8) | self._payload[0]
+        year = (self._payload[0] << 8) | self._payload[1]
         month = self._payload[2]
         day = self._payload[3]
-        h, m, s = self._payload[4:7]
+        h, m, s = self._payload[5:8]
         dt = datetime.datetime(year=year, month=month, day=day, hour=h, minute=m, second=s)
         self.datetime = dt
 
diff --git a/metawatch/watch.py b/metawatch/watch.py
index 101c644..bab34f5 100644
--- a/metawatch/watch.py
+++ b/metawatch/watch.py
@@ -26,3 +26,7 @@ class Watch:
         o.emit(self._fd)
         i = self._read_packet(protocol.GetRTCResponse)
         return i.datetime
+
+    def set_rtc(self, dt):
+        o = protocol.SetRTC(dt)
+        o.emit(self._fd)