Fix to invalid date format in JSON-LD example for Event, EventCancelled, & SoldOut
Fix to invalid date format in JSON-LD example for Event, EventCancelled, & SoldOut

Fix to invalid date format in JSON-LD example for Event, EventCancelled, & SoldOut includes fix for #636
tfrancart/schemaorg,schemaorg/schemaorg,tfrancart/schemaorg,tfrancart/schemaorg,unor/schemaorg,dbs/schemaorg,unor/schemaorg,gkellogg/schemaorg,twamarc/schemaorg,gkellogg/schemaorg,twamarc/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,vholland/schemaorg,vholland/schemaorg,lanthaler/schemaorg,tfrancart/schemaorg,schemaorg/schemaorg,twamarc/schemaorg,vholland/schemaorg,lanthaler/schemaorg,dbs/schemaorg,unor/schemaorg,vholland/schemaorg,dbs/schemaorg,lanthaler/schemaorg,schemaorg/schemaorg,dbs/schemaorg,gkellogg/schemaorg,gkellogg/schemaorg