xmpDWChapter021             Date and Time Conventions and Standards
xmpDWChapter022             Manage POSIXt Objects from R's base Package
xmpDWChapter023             Calendar Time Date Objects
xmpDWChapter024             Calendar Time Series Objects
xmpDWChapter025             Calendarical Calculations

xmpZWChapter02              Zivot-Wang Chapter 2 Time Series in S-Plus