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# Local time zone (AT = GMT+2):
55 10 ? * MON-FRI *

Sources:

Schedule Expressions for Rules - Amazon CloudWatch Events
Describes how to use cron or rate expressions to automate AWS with Amazon CloudWatch Events.
Amazon CloudWatch Events

https://aws.amazon.com/de/premiumsupport/knowledge-center/start-stop-lambda-cloudwatch/

http://www.cronmaker.com/