GMT cron expression for a PST based schedule?

Question

I want to setup a cron schedule for running something every 30 minutes from 6:00am to 11:30pm daily, Pacific Standard Time. I'm setting this up on an AWS Lambda function, which works strictly with GMT.

I first tried an approximation, ignoring DST: 0,30 0-7,14-23 * * *

This gave a syntax error. What am I missing?

Answer 1

You need an extra asterisk (*) or more specifically, you are missing a field in the statement.

http://docs.aws.amazon.com/lambda/latest/dg/tutorial-scheduled-events-schedule-expressions.html