| Date | Various date utilities | 
| date | Get/set date component of a date-time | 
| date<- | Get/set date component of a date-time | 
| DateTimeUpdate | Changes the components of a date object | 
| date_decimal | Converts a decimal to a date | 
| day | Get/set days component of a date-time | 
| day<- | Get/set days component of a date-time | 
| days | Create or parse period objects | 
| days_in_month | Get the number of days in the month of a date-time | 
| ddays | Create a duration object. | 
| decimal_date | Converts a date to a decimal of its year | 
| dhours | Create a duration object. | 
| dmicroseconds | Create a duration object. | 
| dmilliseconds | Create a duration object. | 
| dminutes | Create a duration object. | 
| dmonths | Create a duration object. | 
| dmy | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| dmy_h | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| dmy_hm | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| dmy_hms | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| dnanoseconds | Create a duration object. | 
| dpicoseconds | Create a duration object. | 
| dseconds | Create a duration object. | 
| dst | Get *d*aylight *s*avings *t*ime indicator of a date-time | 
| duration | Create a duration object. | 
| Duration-class | Duration class | 
| durations | Duration class | 
| dweeks | Create a duration object. | 
| dyears | Create a duration object. | 
| dym | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| instant | Is x a date-time object? | 
| instants | Is x a date-time object? | 
| interval | Utilities for creation and manipulation of 'Interval' objects | 
| Interval-class | Interval class | 
| intervals | Interval class | 
| int_aligns | Utilities for creation and manipulation of 'Interval' objects | 
| int_diff | Utilities for creation and manipulation of 'Interval' objects | 
| int_end | Utilities for creation and manipulation of 'Interval' objects | 
| int_end<- | Utilities for creation and manipulation of 'Interval' objects | 
| int_flip | Utilities for creation and manipulation of 'Interval' objects | 
| int_length | Utilities for creation and manipulation of 'Interval' objects | 
| int_overlaps | Utilities for creation and manipulation of 'Interval' objects | 
| int_shift | Utilities for creation and manipulation of 'Interval' objects | 
| int_standardize | Utilities for creation and manipulation of 'Interval' objects | 
| int_start | Utilities for creation and manipulation of 'Interval' objects | 
| int_start<- | Utilities for creation and manipulation of 'Interval' objects | 
| is.Date | Various date utilities | 
| is.difftime | Is x a difftime object? | 
| is.duration | Create a duration object. | 
| is.instant | Is x a date-time object? | 
| is.interval | Utilities for creation and manipulation of 'Interval' objects | 
| is.period | Create or parse period objects | 
| is.POSIXct | Various POSIX utilities | 
| is.POSIXlt | Various POSIX utilities | 
| is.POSIXt | Various POSIX utilities | 
| is.timepoint | Is x a date-time object? | 
| is.timespan | Is x a length of time? | 
| isoweek | Get/set weeks component of a date-time | 
| isoyear | Get/set years component of a date-time | 
| m+ | Add and subtract months to a date without exceeding the last day of the new month | 
| m- | Add and subtract months to a date without exceeding the last day of the new month | 
| make_date | Efficient creation of date-times from numeric representations | 
| make_datetime | Efficient creation of date-times from numeric representations | 
| make_difftime | Create a difftime object. | 
| mday | Get/set days component of a date-time | 
| mday<- | Get/set days component of a date-time | 
| mdy | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| mdy_h | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| mdy_hm | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| mdy_hms | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| microseconds | Create or parse period objects | 
| milliseconds | Create or parse period objects | 
| minute | Get/set minutes component of a date-time | 
| minute<- | Get/set minutes component of a date-time | 
| minutes | Create or parse period objects | 
| month | Get/set months component of a date-time | 
| month<- | Get/set months component of a date-time | 
| months.numeric | Create or parse period objects | 
| ms | Parse periods with *h*our, *m*inute, and *s*econd components | 
| my | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| myd | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| yday | Get/set days component of a date-time | 
| yday<- | Get/set days component of a date-time | 
| ydm | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| ydm_h | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| ydm_hm | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| ydm_hms | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| year | Get/set years component of a date-time | 
| year<- | Get/set years component of a date-time | 
| years | Create or parse period objects | 
| ym | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| ymd | Parse dates with *y*ear, *m*onth, and *d*ay components | 
| ymd_h | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| ymd_hm | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| ymd_hms | Parse date-times with *y*ear, *m*onth, and *d*ay, *h*our, *m*inute, and *s*econd components. | 
| yq | Parse dates with *y*ear, *m*onth, and *d*ay components |