How to use {{=day+0}} and {{=bday+0}} attributes

{{=day+0}} (Day of the week)

The {{=day+0}} attribute transforms to the current day of the week when the email gets sent out. 
You can change 0 to any numeric value to transform to another day of the week. 

Example:
If today is Monday, "Happy {{=day+0}}" will transform to "Happy Monday"
"Happy {{day+2}}" will be "Happy Wednesday" and so on..

{{=bday+0}} (Business day of the week)

The {{=bday+0}} attribute transforms to the current day if the current day is a business day (Monday to Friday). You can change 0 to any numeric value to transform to another business day of the week. 

Example:
If today is Monday, "Happy {{=bday+0}}" will transform to "Happy Monday" 
If today is Friday, "Are you available on {{=bday+1}}?" will transform to "Are you available on Monday?"  
(Saturdays and Sundays are not counted)
If today is Thursday, "Happy {{=bday+3}}" will transform to "Happy Tuesday"