Starting an Application on Weekday Logon Only, Skipping Holidays

This article describes a programmer's solution to automatically launch Webex (CiscoCollabHost.exe) only on weekday logons, excluding weekends and public holidays. The author, who works from home, forgot to start Webex and missed a customer call, prompting an automated fix. The solution uses a PowerShell script placed in the Windows Startup folder. The script checks the current day and date against a list of public holidays for North Rhine-Westphalia (NRW), including movable holidays calculated via the Gauss algorithm for Easter Sunday. Fixed holidays are hardcoded. The script ensures Webex only runs on workdays, avoiding availability on non-working days. The post includes the full PowerShell code and explains the logic behind holiday computation.