Returns the cycle index when a date, time, or datetime interval and value are specified.

Category: | Date and Time |

specifies a character constant, a variable, or an expression that contains an interval name such as WEEK, MONTH, or QTR. Interval can appear in uppercase or lowercase. The possible values of interval are listed in Intervals Used with Date and Time Functions in SAS Language Reference: Concepts.

Multipliers and shift
indexes can be used with the basic interval names to construct more
complex interval specifications. The general form of an interval name
is as follows:

The three parts of the interval name are as follows:

specifies the name of the basic interval type. For example, YEAR specifies yearly intervals.

specifies an optional multiplier that sets the interval equal to a multiple of the period of the basic interval type. For example, the interval YEAR2 consists of two-year, or biennial, periods.

See | Incrementing Dates and Times by Using Multipliers and by Shifting Intervals for more information. |

specifies an optional shift index that shifts the interval to start at a specified subperiod starting point. For example, YEAR.3 specifies yearly periods shifted to start on the first of March of each calendar year and to end in February of the following year.

Restrictions | The shift index cannot be greater than the number of subperiods in the whole interval. For example, you could use YEAR2.24, but YEAR2.25 would be an error because there is no 25th month in a two-year interval. |

If the default shift period is the same as the interval, then only multiperiod intervals can be shifted with the optional shift index. For example, because MONTH intervals shift by MONTH periods by default, monthly intervals cannot be shifted with the shift index. However, bimonthly intervals can be shifted with the shift index, because there are two MONTH intervals in each MONTH2 interval. For example, the interval name MONTH2.2 specifies bimonthly periods starting on the first day of even-numbered months. | |

See | Incrementing Dates and Times by Using Multipliers and by Shifting Intervals for more information. |

specifies a date, time, or datetime value that represents a time period of a specified interval.

The INTCINDEX function
returns the index of the seasonal cycle when you specify an interval
and a SAS date, time, or datetime value. For example, if the interval
is MONTH, each observation in the data corresponds to a particular
month. Monthly data is considered to be periodic for a one-year period.
A year contains 12 months, so the number of intervals (months) in
a seasonal cycle (year) is 12. WEEK is the seasonal cycle for an
interval that is equal to DAY. Therefore,

`intcindex('day','01SEP78'd);`

returns a value of 35 because September 1, 1978, is the sixth day
of the 35th week of the year. For more information about working with
date and time intervals, see Date and Time Intervals.
The INTCINDEX function
returns the cycle index, whereas the INTINDEX function returns the
seasonal index.

In the example

`cycle_index = intcindex('day','04APR2005'd);`

, the INTCINDEX
function returns the week of the year. In the example `index = intindex('day','04APR2005'd);`

, the INTINDEX
function returns the day of the week.
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