# Substitutable Parameters

The administrator can define substitutable parameters in the FILE parameter of the CfAlias file.

Substitutable parameters are defined by a percent sign (%) followed by the parameter name. See the following table for the supported substitutable parameters:

Substitutable Parameters | Description
--- | ---
%JDATE | Julian date (YYDDD)
%JDATEC | Julian date (CCYYDDD)
%GDATE | Gregorian date (YYMMDD)
%GDATEC | Gregorian date (CCYYMMDD)
%TIMET | Time (HHMMSST)
%TIME | Time (HHMMSS)
%NODE | Node name (If no node is defined, use the value NODE.)
%USER | User name
%TRN | Transaction number
%SYSID | System name
%ACB | VTAM ACB name (z/OS only)

For example, `FILE=/u/prtom/abc123.20090718.1601029` can be substituted as `FILE=/u/%USER/abc123.%GDATEC.%TIMET`.

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