Manipulating DATETIME/INTERVAL in ESQL/C

Hi All, Does informix 4.0 ESQL/C has funtion to +/- datetime or interval values like 4gl? And How? Thanks. Min ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Min Qiu Network Engineer BBN Planet. Email: min@sura.net 8400 Baltimore Boulevard Phone: (301) 982-4600 ext 168 College Park, MD 20740 Fax: (301) 982-4605 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~