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+ /// Cron expressions are comprised of 6 required fields and one optional field + /// separated by white space. The fields respectively are described as follows: + ///
+ ///| Field Name | + ///+ /// | Allowed Values | + ///+ /// | Allowed Special Characters | + ///
|---|---|---|---|---|
| Seconds | + ///+ /// | 0-59 | + ///+ /// | , - /// / | + ///
| Minutes | + ///+ /// | 0-59 | + ///+ /// | , - /// / | + ///
| Hours | + ///+ /// | 0-23 | + ///+ /// | , - /// / | + ///
| Day-of-month | + ///+ /// | 1-31 | + ///+ /// | , - /// ? / L W C | + ///
| Month | + ///+ /// | 1-12 or JAN-DEC | + ///+ /// | , - /// / | + ///
| Day-of-Week | + ///+ /// | 1-7 or SUN-SAT | + ///+ /// | , - /// ? / L # | + ///
| Year (Optional) | + ///+ /// | empty, 1970-2099 | + ///+ /// | , - /// / | + ///
+ /// The '*' character is used to specify all values. For example, "*" + /// in the minute field means "every minute". + ///
+ ///+ /// The '?' character is allowed for the day-of-month and day-of-week fields. It + /// is used to specify 'no specific value'. This is useful when you need to + /// specify something in one of the two fields, but not the other. + ///
+ ///+ /// The '-' character is used to specify ranges For example "10-12" in + /// the hour field means "the hours 10, 11 and 12". + ///
+ ///+ /// The ',' character is used to specify additional values. For example + /// "MON,WED,FRI" in the day-of-week field means "the days Monday, + /// Wednesday, and Friday". + ///
+ ///+ /// The '/' character is used to specify increments. For example "0/15" + /// in the seconds field means "the seconds 0, 15, 30, and 45". And + /// "5/15" in the seconds field means "the seconds 5, 20, 35, and + /// 50". Specifying '*' before the '/' is equivalent to specifying 0 is + /// the value to start with. Essentially, for each field in the expression, there + /// is a set of numbers that can be turned on or off. For seconds and minutes, + /// the numbers range from 0 to 59. For hours 0 to 23, for days of the month 0 to + /// 31, and for months 1 to 12. The "/" character simply helps you turn + /// on every "nth" value in the given set. Thus "7/6" in the + /// month field only turns on month "7", it does NOT mean every 6th + /// month, please note that subtlety. + ///
+ ///+ /// The 'L' character is allowed for the day-of-month and day-of-week fields. + /// This character is short-hand for "last", but it has different + /// meaning in each of the two fields. For example, the value "L" in + /// the day-of-month field means "the last day of the month" - day 31 + /// for January, day 28 for February on non-leap years. If used in the + /// day-of-week field by itself, it simply means "7" or + /// "SAT". But if used in the day-of-week field after another value, it + /// means "the last xxx day of the month" - for example "6L" + /// means "the last friday of the month". When using the 'L' option, it + /// is important not to specify lists, or ranges of values, as you'll get + /// confusing results. + ///
+ ///+ /// The 'W' character is allowed for the day-of-month field. This character + /// is used to specify the weekday (Monday-Friday) nearest the given day. As an + /// example, if you were to specify "15W" as the value for the + /// day-of-month field, the meaning is: "the nearest weekday to the 15th of + /// the month". So if the 15th is a Saturday, the trigger will fire on + /// Friday the 14th. If the 15th is a Sunday, the trigger will fire on Monday the + /// 16th. If the 15th is a Tuesday, then it will fire on Tuesday the 15th. + /// However if you specify "1W" as the value for day-of-month, and the + /// 1st is a Saturday, the trigger will fire on Monday the 3rd, as it will not + /// 'jump' over the boundary of a month's days. The 'W' character can only be + /// specified when the day-of-month is a single day, not a range or list of days. + ///
+ ///+ /// The 'L' and 'W' characters can also be combined for the day-of-month + /// expression to yield 'LW', which translates to "last weekday of the + /// month". + ///
+ ///+ /// The '#' character is allowed for the day-of-week field. This character is + /// used to specify "the nth" XXX day of the month. For example, the + /// value of "6#3" in the day-of-week field means the third Friday of + /// the month (day 6 = Friday and "#3" = the 3rd one in the month). + /// Other examples: "2#1" = the first Monday of the month and + /// "4#5" = the fifth Wednesday of the month. Note that if you specify + /// "#5" and there is not 5 of the given day-of-week in the month, then + /// no firing will occur that month. If the '#' character is used, there can + /// only be one expression in the day-of-week field ("3#1,6#3" is + /// not valid, since there are two expressions). + ///
+ ///+ /// + ///
+ ///+ /// The legal characters and the names of months and days of the week are not + /// case sensitive. + ///
+ ///+ /// NOTES: + ///