The Java EE 6 Tutorial, Volume I

Specifying Multiple Values in Calendar Expressions

You can specify multiple values in calendar expressions in the following ways:

Using Wildcards in Calendar Expressions

Setting an attribute to an asterisk symbol (*) represents all allowable values for the attribute.

Example 16–9 Calendar Expressions with Wildcards

The following expression represents every minute:


The following expression represents every day of the week:


Specifying a List of Values

To specify two or more values for an attribute, use a comma (,) to separate the values. A range of values are allowed as part of a list. Wildcards and intervals, however, are not allowed.

Duplicates within a list are ignored.

Example 16–10 Calendar Expressions with a List of Values

The following expression sets the day of the week to Tuesday and Thursday:

dayOfWeek="Tue, Thu"

The following expression represents 4:00 AM, every hour from 9:00 AM to 5:00 PM using a range, and 10:00 PM:


Specifying a Range of Values

Use a dash character (-) to specify an inclusive range of values for an attribute. Members of a range cannot be wildcards, lists, or intervals. If the range is of the form x-x, it is equivalent to the single-valued expression x. If the range is of the form x-y and x is greater than y, it is equivalent to the expression x-maximum value, minimum value-y. That is, the expression begins at x, rolls-over to the beginning of the allowable values, and continues up to y.

Example 16–11 Calendar Expressions Using Ranges

The following expression represents 9:00 AM to 5:00 PM:


The following expression represents Friday through Monday:


The following expression represents the 25th day of the month to the end of the month, and the beginning of the month to the 5th day of the month:


It is equivalent to the following expression:


Specifying Intervals

The forward slash (/) constrains an attribute to a starting point and an interval. It is used to specify every N seconds, minutes, or hours within the minute, hour or day. For an expression of the form x/y, x represents the starting point and y represents the interval. The wildcard character may be used in the x position of an interval, and is equivalent to setting x to 0.

Intervals may only be set for second, minute, and hour attributes.

Example 16–12 Calendar Expressions Using Intervals

The following expression represents every 10 minutes within the hour:


It is equivalent to:


The following expression represents every two hours starting at noon: