Inject some date-and-location-specific properties into the config map

[mykelalvis]

Specifically, it would be nice if we had

• ${date.this.day} (ex "2")
• ${date.this.day.name} (ex "Tuesday")
• ${date.this.month} (ex 02
• ${date.this.month.name} (ex "February" or "Feb")
• ${date.last.month} (ex. 01)
• ${date.last.month.name} (ex "Jan")
• ${date.this.year} (ex 2019)

• ${date.last.year} (ex 2018)

  as substitute-able properties

That way, you could embed specific dates into the metadata using something like <tag>${date.this.year}-${date.this.month}-15</tag> which would always put in a value that was the 15th of this month/year no matter when you ran it.