{
  "title": "timestamp with now",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "description": "ISO format yyyy-mm-dd HH:MM[:SS] or now or now + HH:MM[:SS] or now + SECONDS",
  "type": "string",
  "pattern": "^(now(\\s*\\+\\s*(\\d{1,2}:\\d{1,2}(:\\d{1,2})?|\\d+)?)?|\\d{4}-\\d{2}-\\d{2}\\s\\d{1,2}:\\d{1,2}(:\\d{1,2})?)$"
}