| DclGetDate (DATEQ 1,2,3) | Get the date in today. | 
| DclAddDate (DATEF 1,2,3) | Add the number of days to date. | 
| DclDiffDate (DATEG 1,2,3) | Get difference dated a day. | 
| DclFormatDate (DATEC 1,2,3) | Transform into format that was designated the date. | 
| DclDayOfWeek (IWEEK 1,2,3) | Get date of the week number. | 
| DclLengthOfMonth (NDMON) | Get the length (the number of days) in a month. | 
| DclLengthOfYear (NDYEAR) | Get the length (the number of days) in 1 year. | 
*The corresponding f77 interface name in parentheses.