[[schedule-monthly]]
==== Monthly Schedule
A <<trigger-schedule, `schedule`>> that triggers at a specific day and time
every month. To use the `monthly` schedule, you specify the day of the month and time (or days and times)
when you want the scheduler to start the watch execution with the `on` and `at` attributes.

You specify the day of month as a numeric value between `1` and `31` (inclusive). Times are specified in the 
form `HH:mm` on a 24-hour clock. You can also use the reserved values 
`midnight` and `noon` for `00:00` and `12:00`.

===== Configuring a Monthly Schedule
To configure a once a month schedule, you specify a single day and time with the `on` 
and `at` attributes. For example, the following `monthly` schedule triggers on the 10th of each
month at noon. 

[source,json]
--------------------------------------------------
{
  ...
  "trigger" : {
    "schedule" : {
      "monthly" : { "on" : 10, "at" : "noon" }
    }
  }
  ...
}
--------------------------------------------------

NOTE: You can also specify the day and time with the `day` and `time` attributes, they are
interchangeable with `on` and `at`. 

===== Configuring a Multiple Times Monthly Schedule

To configure a `monthly` schedule that triggers multiple times a month, you can specify 
an array of day and time values. For example, the following `monthly` schedule
triggers at 12:00 PM on the 10th of each month and at 5:00 PM on the 20th of each month. 

[source,json]
--------------------------------------------------
{
  ...
  "trigger" : {
    "schedule" : {
      "monthly" : [
          { "on" : 10, "at" : "noon" },
          { "on" : 20, "at" : "17:00" }
      ]
    }
  }
  ...
}
--------------------------------------------------

Alternatively, you can specify days and times in an object that has `on` and `at` attributes
that contain an array of values. For example, the following `monthly` schedule triggers at 12:00 AM and 12:00 PM on the 
10th and 20th of each month.

[source,json]
--------------------------------------------------
{
  ...
  "trigger" : {
    "schedule" : {
      "monthly" : {
        "on" : [ 10, 20 ],
        "at" : [ "midnight", "noon" ]
      }
    }
  }
  ...
}
--------------------------------------------------