[BUG] Creating scheduled dashboards report

[ajacobsson]

Describe the bug

When trying to save a scheduled generation of a dashboards report sometimes there's a cron syntax error thrown even though the syntax is correct. It turns out that when switching time zone the problem disappears. So currently it's unclear if the problem only persists for the time zone EST or if it's a combination of cron syntax and time zone or if there are other time zones that also cause this problem.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'OpenSearch Plugins/Reporting/Create'
2. Click on 'Report trigger: Schedule/request time: Cron based'
3. Enter any valid cron expression: e.g. '0 12 * * *'
4. Select Timezone: EST
5. If not shown immediately, press Save Changes.
6. See error

Expected behavior
Using correct cron syntax with any timezone should work.

OpenSearch Version
2.15.0

Dashboards Version
v 2.13.0

Screenshots

Host/Environment (please complete the following information):

• OS: Windows 10 Enterprise
• Browser and version: Firefox 29.0.2

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