Adding documentation of CFP date string change

Author: bridgetkromhout

REFERENCE.md

@@ -45,14 +45,14 @@ The YYYY-CITY.yml file is the main configuration file for your event. This is wh
 | `speakers_verbose` | String | No     | Set this to "true" if you want verbose speaker attributes (URLs visible).                             | "true"                                        |
 
 ### Date-related Fields
-All dates are in unquoted YYYY-MM-DD, like this: `variable: 2016-01-05`
+All dates are in unquoted YYYY-MM-DD, like this: `variable: 2016-01-05`, or like `variable: 2016-01-05T23:59:00-06:00`
 
 | Field Name              | Type       | Required | Description                                                                                                                                                                                                                   | Example                                               |
 |-------------------------|------------|----------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------|
 | `startdate`               | YYYY-MM-DD | No       | The start date of your event. Leave blank if you don't have a venue reserved yet.                                                                                                                                             | 2016-01-05                                            |
 | `enddate`                 | YYYY-MM-DD | No       | The end date of your event. Leave blank if you don't have a venue reserved yet.                                                                                                                                               | 2016-01-05                                            |
 | `cfp_date_start`          | YYYY-MM-DD | No       | The date you will start accepting talk proposals. Can be a blank value.                                                                                                                                                       | 2016-01-05                                            |
-| `cfp_date_end`            | YYYY-MM-DD | No       | The date you will close your call for proposals. Can be a blank value.                                                                                                                                                        | 2016-01-05                                            |
+| `cfp_date_end`            | YYYY-MM-DD | No       | The date you will close your call for proposals. Can be a blank value. If you set the full datetime string with correct TZ, CFP will display as open until local close time.                                                  | 2016-01-05T23:59:00-06:00                             |
 | `cfp_date_announce`       | YYYY-MM-DD | No       | The date you will inform proposers of status. Can be a blank value.                                                                                                                                                           | 2016-01-05                                            |
 | `cfp_open`                | String     | No       | Either "true" or "false". Can be blank. This controls whether or not the "propose" button shows on your event page. *Deprecated field; if you have set `cfp_date_start` and `cfp_date_end` they will serve the same purpose.* | "true"                                                |
 | `cfp_link`                | String     | No       | If you have a custom link for submitting proposals, add it here. This will control the Propose menu item as well as the "Propose" button.                                                                                     | "https://myurlhere" |