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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Data manipulation
Date and time data typesThis section describes the date and time data types and the functions that the DataBlade® API supports to process date and time data.
Date dataDate data is a calendar date. The DataBlade® API provides support for date values in both their text and binary representations.
Conversion of date representationsBoth the DataBlade® API library and the Informix® ESQL/C library provide functions that convert from the text (string) representation of a date value to the binary (internal) representation for DATE.
DataBlade® API functions for date conversionThe DataBlade® API provides functions for conversion between text and binary representations of date data.

DataBlade API functions for date conversion

The DataBlade® API provides functions for conversion between text and binary representations of date data.

Table 1. DataBlade API functions for date conversion
DataBlade API function	Convert from	Convert to
mi_date_to_string()	DATE (mi_date)	Date string
mi_string_to_date()	Date string	DATE (mi_date)

Server only: The mi_date_to_string() and mi_string_to_date() functions are useful in the input and output support functions of an opaque data type that contains mi_date values. They allow you to convert DATE values between their external format (text) and their internal (binary) format when transferred to and from client applications.

The mi_date_to_string() and mi_string_to_date() functions use the current processing locale to handle locale-specific formats in the date string. For more information, see the Informix® GLS User's Guide.

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