Function parseCronHours

Parses CronHours into a string.

Example

parseCronHours(10); // "10"
parseCronHours("*"); // "*"
parseCronHours({ every: 10, start: 2 }); // "2/10"
parseCronHours([1, 2, 3, 4]); // "1,2,3,4"
parseCronHours({ from: 5, to: 10 }); // "5-10"
parseCronHours([1, 2, 3, 4, { from: 5, to: 10 }]); // "1,2,3,4,5-10"

Returns

A string or undefined if invalid.