Feature request: Method for checking if now is a valid occurance

[Pandetthe]

Hi, I am working on a small project for scheduling custom scripts from db. I was trying to check if DateTime.UtcNow is a valid occurance, but I came across the lack of such an option. I think it could be a good feature.

[odinserj]

You can use something like the following extension method. The main thing is to normalize the given value to ignore everything less than 1 second – milliseconds, ticks. Otherwise it would be very hard to find a matching value.

public static class CronExpressionExtensions
{
    public static bool IsMatch(this CronExpression expression, DateTime utcNow)
    {
        if (expression == null) throw new ArgumentNullException(nameof(expression));
        if (utcNow.Kind != DateTimeKind.Utc) throw new ArgumentException("Should be of DateTimeKind.Utc", nameof(utcNow));

        var normalized = new DateTime(
            utcNow.Year, utcNow.Month, utcNow.Day,
            utcNow.Hour, utcNow.Minute, utcNow.Second,
            DateTimeKind.Utc);

        return expression.GetNextOccurrence(normalized, inclusive: true) == normalized;
    }
}

[Pandetthe]

Thank you very much