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For compatibility, PSPP considers dates before 15 Oct 1582 invalid. Most time and date functions will not accept earlier dates.
| • Time and Date Concepts | How times & dates are defined and represented | |
| • Time Construction | TIME.{DAYS HMS} | |
| • Time Extraction | CTIME.{DAYS HOURS MINUTES SECONDS} | |
| • Date Construction | DATE.{DMY MDY MOYR QYR WKYR YRDAY} | |
| • Date Extraction | XDATE.{DATE HOUR JDAY MDAY MINUTE MONTH QUARTER SECOND TDAY TIME WEEK WKDAY YEAR} | |
| • Time and Date Arithmetic | DATEDIFF DATESUM |