Try to make the cron help clearer
Examples:
</p>
<pre>
-# every fifteen minutes (perhaps at :07, :22, :37, :52)
+# Every fifteen minutes (perhaps at :07, :22, :37, :52):
H/15 * * * *
-# every ten minutes in the first half of every hour (three times, perhaps at :04, :14, :24)
+# Every ten minutes in the first half of every hour (three times, perhaps at :04, :14, :24):
H(0-29)/10 * * * *
-# once every two hours at 45 minutes past the hour starting at 9:45 AM and finishing at 3:45 PM every weekday.
+# Once every two hours at 45 minutes past the hour starting at 9:45 AM and finishing at 3:45 PM every weekday:
45 9-16/2 * * 1-5
-# once in every two hours slot between 9 AM and 5 PM every weekday (perhaps at 10:38 AM, 12:38 PM, 2:38 PM, 4:38 PM)
-H H(9-16)/2 * * 1-5
-# once a day on the 1st and 15th of every month except December
+# Once in every two hour slot between 8 AM and 4 PM every weekday (perhaps at 9:38 AM, 11:38 AM, 1:38 PM, 3:38 PM):
+H H(8-15)/2 * * 1-5
+# Once a day on the 1st and 15th of every month except December:
H H 1,15 1-11 *
</pre>
<h3>Time zone specification</h3>
