You want to test if the leaving date is a Monday or a Wednesday to send a specific message to the guest, for example a reminder that it is bin collection day.
17. [<span style="color: #019cde">[IF=:[LEAVINGDAY:{%u}]:1:yes|[IF=^[LEAVINGDAY:{%u}]^3^yes][IF=^[LEAVINGDAY:{%u}]^6</span><span style="color: #75d5ad">^yes</span><span style="color: #fe746c">]</span>]]
You have different cleaning teams for different days of the week, and you want to send a message to the appropriate team if leaving date is a Monday, Wednesday or Saturday.