Formats
There are three common formats across SAS, SPSS and Stata.
Date (number of days)
- SAS: MMDDYY, DDMMYY, YYMMDD, DATE
- SPSS: n/a
- Stata: %td
Time (number of seconds):
- SAS: TIME, HHMM, TOD
- SPSS: TIME, DTIME
- Stata: n/a
DateTime (number of seconds):
- SAS: DATETIME
- SPSS: DATE, ADATE, SDATE, DATETIME (as milliseconds)
- Stata: %tc, %tC
Offsets
Dates and date times use a difference offset to R:
- SAS: 1960-01-01 (3653 days)
- SPSS: 1582-10-14. (141428 days)
- Stata: 1960-01-01. (3653 days)