# Dates and Times

These are the available functions for dates and times. See each function's help topic in the TERR Language Reference for more information.

Function name | Title description
--- | ---
`-.Date` | Ops Group Method for Date/Time Objects
`-.POSIXt` | Ops Group Method for Date/Time Objects
`.difftime` | Time Intervals
`.leap.seconds` | Date-Time Classes
`.POSIXct` | Date-Time Classes
`.POSIXlt` | Date-Time Classes
`[.Date` | Date Class
`[.difftime` | Time Intervals
`[.POSIXct` | Date-Time Classes
`[.POSIXlt` | Date-Time Classes
`[[.Date` | Date Class
`[[.POSIXct` | Date-Time Classes
`[<-.Date` | Date Class
`[<-.POSIXct` | Date-Time Classes
`[<-.POSIXlt` | Date-Time Classes
`*.difftime` | Ops Group Method for Date/Time Objects
`/.difftime` | Ops Group Method for Date/Time Objects
`+.Date` | Ops Group Method for Date/Time Objects
`+.POSIXt` | Ops Group Method for Date/Time Objects
`as.character.Date` | Date-Time Formatting
`as.character.POSIXt` | Date-Time Formatting
`as.Date` | Date-Time Parsing
`as.Date.character` | Date-Time Parsing
`as.Date.date` | Date-Time Parsing
`as.Date.dates` | Date-Time Parsing
`as.Date.default` | Date-Time Parsing
`as.Date.factor` | Date-Time Parsing
`as.Date.numeric` | Date-Time Parsing
`as.Date.POSIXct` | Date-Time Parsing
`as.Date.POSIXlt` | Date-Time Parsing
`as.difftime` | Date-Time Parsing
`as.POSIXct` | Date-Time Parsing
`as.POSIXct.date` | Date-Time Parsing
`as.POSIXct.Date` | Date-Time Parsing
`as.POSIXct.dates` | Date-Time Parsing
`as.POSIXct.default` | Date-Time Parsing
`as.POSIXct.numeric` | Date-Time Parsing
`as.POSIXct.POSIXlt` | Date-Time Parsing
`as.POSIXlt` | Date-Time Parsing
`as.POSIXlt.character` | Date-Time Parsing
`as.POSIXlt.date` | Date-Time Parsing
`as.POSIXlt.Date` | Date-Time Parsing
`as.POSIXlt.dates` | Date-Time Parsing
`as.POSIXlt.default` | Date-Time Parsing
`as.POSIXlt.factor` | Date-Time Parsing
`as.POSIXlt.numeric` | Date-Time Parsing
`as.POSIXlt.POSIXct` | Date-Time Parsing
`c.difftime` | Time Intervals
`check_tzones` | Get the Current Date, Time, or Time Zone
`cut.Date` | Create Factor by Cutting Date or POSIXt Object
`cut.POSIXt` | Create Factor by Cutting Date or POSIXt Object
`date` | Get the Current Date, Time, or Time Zone
`Date` | Date Class
`difftime` | Time Intervals
`format.Date` | Date-Time Formatting
`format.difftime` | Date-Time Formatting
`format.POSIXct` | Date-Time Formatting
`format.POSIXlt` | Date-Time Formatting
`ISOdate` | Construct Date-time from Broken-down Time
`ISOdatetime` | Construct Date-time from Broken-down Time
`julian` | Extract Parts of a Date or POSIXt Object
`julian.Date` | Extract Parts of a Date or POSIXt Object
`julian.POSIXt` | Extract Parts of a Date or POSIXt Object
`Math.Date` | Math Group Method for Date/Time Objects
`Math.difftime` | Math Group Method for Date/Time Objects
`Math.POSIXt` | Math Group Method for Date/Time Objects
`months` | Extract Parts of a Date or POSIXt Object
`months.Date` | Extract Parts of a Date or POSIXt Object
`months.POSIXt` | Extract Parts of a Date or POSIXt Object
`OlsonNames` | Time Zones
`Ops.Date` | Ops Group Method for Date/Time Objects
`Ops.difftime` | Ops Group Method for Date/Time Objects
`Ops.POSIXt` | Ops Group Method for Date/Time Objects
`POSIXct` | Date-Time Classes
`POSIXlt` | Date-Time Classes
`POSIXt` | Date-Time Classes
`print.Date` | Date Class
`print.difftime` | Time Intervals
`print.POSIXct` | Date-Time Classes
`print.POSIXlt` | Date-Time Classes
`quarters` | Extract Parts of a Date or POSIXt Object
`quarters.Date` | Extract Parts of a Date or POSIXt Object
`quarters.POSIXt` | Extract Parts of a Date or POSIXt Object
`round.Date` | Math Group Method for Date/Time Objects
`round.POSIXt` | Math Group Method for Date/Time Objects
`seq.Date` | Sequences of Date-Times
`seq.POSIXt` | Sequences of Date-Times
`strftime` | Date-Time Formatting
`strptime` | Date-Time Parsing
`Summary.Date` | Summary Group Method for Date/Time Objects
`Summary.difftime` | Summary Group Method for Date/Time Objects
`Summary.POSIXct` | Summary Group Method for Date/Time Objects
`Summary.POSIXlt` | Summary Group Method for Date/Time Objects
`Sys.Date` | Get the Current Date, Time, or Time Zone
`Sys.time` | Get the Current Date, Time, or Time Zone
`Sys.timezone` | Get the Current Date, Time, or Time Zone
`trunc.Date` | Math Group Method for Date/Time Objects
`trunc.POSIXt` | Math Group Method for Date/Time Objects
`units` | Units for Time Intervals
`units.difftime` | Units for Time Intervals
`units<-` | Units for Time Intervals
`units<-.difftime` | Units for Time Intervals
`weekdays` | Extract Parts of a Date or POSIXt Object
`weekdays.Date` | Extract Parts of a Date or POSIXt Object
`weekdays.POSIXt` | Extract Parts of a Date or POSIXt Object