DATETIME and INTERVAL library functions

You must use the following library functions for the datetime and interval data types to perform all operations on those types of values. The following C functions are available in to handle datetime and interval host variables.
Function name Description See
dtaddinv() Adds an interval value to a datetime value The dtaddinv() function
dtcurrent() Gets the current date and time The dtcurrent() function
dtcvasc() Converts an ANSI-compliant character string to a datetime value The dtcvasc() function
dtcvfmtasc() Converts a character string with a specified format to a datetime value The dtcvfmtasc() function
dtextend() Changes the qualifier of a datetime value The dtextend() function
dtsub() Subtracts one datetime value from another The dtsub() function
dtsubinv() Subtracts an interval value from a datetime value The dtsubinv() function
dttoasc() Converts a datetime value to an ANSI-compliant character string The dttoasc() function
dttofmtasc() Converts a datetime value to a character string with a specified format The dttofmtasc() function
incvasc() Converts an ANSI-compliant character string to an interval value The incvasc() function
incvfmtasc() Converts a character string with a specified format to an interval value The incvfmtasc() function
intoasc() Converts an interval value to an ANSI-compliant character string The intoasc() function
intofmtasc() Converts an interval value to a character string with a specified format The intoasc() function
invdivdbl() Divides an interval value by a numeric value The intofmtasc() function
invdivinv() Divides an interval value by another interval value The invdivdbl() function
invextend() Extends an interval value to a different interval qualifier The invdivinv() function
invmuldbl() Multiplies an interval value by a numeric value The invextend() function

For more information about operations on the SQL DATETIME and INTERVAL data types, see the HCL® Informix® Guide to SQL: Reference.