Ok, take a look at the example flow below.
The 2 inject nodes open & close the gate to show you how it works.
The Cron+ node will do exactly the same, but at 21:00 and 06:00.
[{"id":"b3bc4f31328ab115","type":"cronplus","z":"217df193.d774ce","name":"","outputField":"payload","timeZone":"","persistDynamic":false,"commandResponseMsgOutput":"output1","outputs":1,"options":[{"name":"Close gate","topic":"control","payloadType":"str","payload":"close","expressionType":"cron","expression":"0 0 21 * * *","location":"","offset":"0","solarType":"all","solarEvents":"sunrise,sunset"},{"name":"Open gate","topic":"control","payloadType":"str","payload":"open","expressionType":"cron","expression":"0 0 06 * * *","location":"","offset":"0","solarType":"all","solarEvents":"sunrise,sunset"}],"x":725,"y":395,"wires":[["90da55b0a09e9d60"]]},{"id":"90da55b0a09e9d60","type":"gate","z":"217df193.d774ce","name":"","controlTopic":"control","defaultState":"open","openCmd":"open","closeCmd":"close","toggleCmd":"toggle","defaultCmd":"default","statusCmd":"status","persist":false,"storeName":"RAM","x":895,"y":335,"wires":[[]]},{"id":"145f06f76daf5d73","type":"inject","z":"217df193.d774ce","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"control","payload":"open","payloadType":"str","x":715,"y":320,"wires":[["90da55b0a09e9d60"]]},{"id":"871419e5ee7e76b1","type":"inject","z":"217df193.d774ce","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"control","payload":"close","payloadType":"str","x":715,"y":355,"wires":[["90da55b0a09e9d60"]]}]