Format conversion functions convert fields from one format to
another.
For information on field formats see the Describing
Data manual.
For many functions, the output argument can be supplied
either as a field name or as a format enclosed in single quotation
marks. However, if a function is called from a Dialogue Manager
command, this argument must always be supplied as a format, and
if a function is called from a Maintain procedure, this argument
must always be supplied as a field name. For detailed information
about calling a function and supplying arguments, see Accessing and Calling a Function.
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