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There are three common formats across SAS, SPSS and Stata.
Date (number of days)
Time (number of seconds):
DateTime (number of seconds):
Dates and date times use a difference offset to R:
r -as.integer(as.Date("1960-01-01"))
days)r -as.integer(as.Date("1582-10-14"))
days)r -as.integer(as.Date("1960-01-01"))
days)SPSS: https://www.ibm.com/docs/en/spss-statistics/29.0.0?topic=wizard-dates-times-in-spss-statistics https://www.ibm.com/docs/en/spss-statistics/29.0.0?topic=formats-date-time
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