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#### 7.7.8 Time & Date Functions

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