<p>The date and time for the action to start, in YYYY-MM-DDThh:mm:ssZ format in UTC/GMT only and in quotes (for example, <code>"2019-06-01T00:00:00Z"</code>).</p> <p>If you specify <code>Recurrence</code> and <code>StartTime</code>, Amazon EC2 Auto Scaling performs the action at this time, and then performs the action based on the specified recurrence.</p> <p>If you try to schedule the action in the past, Amazon EC2 Auto Scaling returns an error message.</p>

<p>The recurring schedule for the action, in Unix cron syntax format. This format consists of five fields separated by white spaces: [Minute] [Hour] [Day_of_Month] [Month_of_Year] [Day_of_Week]. The value must be in quotes (for example, <code>"30 0 1 1,6,12 *"</code>). For more information about this format, see <a href="http://crontab.org">Crontab</a>.</p> <p>When <code>StartTime</code> and <code>EndTime</code> are specified with <code>Recurrence</code>, they form the boundaries of when the recurring action starts and stops.</p> <p>Cron expressions use Universal Coordinated Time (UTC) by default.</p>

<p>Specifies the time zone for a cron expression. If a time zone is not provided, UTC is used by default. </p> <p>Valid values are the canonical names of the IANA time zones, derived from the IANA Time Zone Database (such as <code>Etc/GMT+9</code> or <code>Pacific/Tahiti</code>). For more information, see <a href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones">https://en.wikipedia.org/wiki/List_of_tz_database_time_zones</a>.</p>