Make date formatting consistent

index.html

@@ -43,14 +43,14 @@ The GPIO test measures how quickly pins can communicate with a processor core; t
 <td>60.00</td>
 <td>iCE40UP5K</td>
 <td>iCEBreaker V1.0e, 120 MHz, <a href=GPIO/iCE40/ring.v>Verilog</a> (<a href=GPIO/iCE40/README.md>notes</a>)</td>
-<td>September, 2021</td>
+<td>September 2021</td>
 </tr>
 
 <tr>
 <td>23.08</td>
 <td>IMXRT1062</td>
 <td>Teensy 4.1, 600 MHz, <a href=GPIO/Arduino/ring.ino>Fast</a>, <a href=GPIO/IMXRT1062/ring.IMXRT1062.ino>GPIO</a></td>
-<td>August, 2021</td>
+<td>August 2021</td>
 </tr>
 
 <tr>