unix-cron-to-aws-cron

when you want to support standard unix crontab syntax running on aws eventbridge

key conversions

• field count: converts 5-field unix format to 6-field aws format
• adds cron() wrapper
• converts unix (0-7) to aws (1-7) format
• handles aws restriction where you can't specify both day fields
• replaces unused * with ? as required by aws
• adds configurable year field (defaults to *)

examples

• daily at noon: 0 12 * * * → cron(0 12 ? * ? *)
• weekdays at 9:30: 30 9 * * 1-5 → cron(30 9 ? * 2-6 *)
• every sunday: 0 2 * * 0 → cron(0 2 ? * 1 *)
• first of month: 0 0 1 * * → cron(0 0 1 * ? *)