| abclock | | Analogue Bitmap Clock |
| akonadi-calendar | | Akonadi calendar integration |
| akonadi-calendar-tools | | CLI tools to manage akonadi calendars |
| anacron | | Periodic command scheduler |
| asclock | | NeXTstep-like clock and calendar |
| asclock-gtk | | Dockable clock and calendar with themes for GTK+ |
| asclock-xlib | | Dockable clock and calendar with themes for X11 |
| bbdate | | Display the current date |
| cal | | Enhanced color version of standard calendar utility |
| calcurse | | Text based calendar and scheduling application |
| calendarsupport | | Calendar support library |
| cardboard-schedule | | Project and resource management software implemented in Java/Swing |
| catclock | | Variant of the MIT xclock with a cat mode |
| clock-rs | | Modern, terminal-based digital clock |
| dates (V) | | Dates is a small, lightweight calendar |
| dateutils | | Command line tools for working with dates |
| dclock | | Digital clock for X |
| ddate | | Discordian calendar date(1) command |
| deforaos-todo | | DeforaOS desktop todo list |
| devtodo | | Display and manage a list of items that are outstanding |
| emiclock | | Analog clock with image in the middle |
| evolution (V) | | Mail and calendar client from GNOME |
| fet | | Automatically schedule timetables |
| gcal | | GNU version of the standard calendar utility |
| gchore | | Chore reminder tool with gtk UI |
| gkrellaclock | | Nice analog clock for Gkrellm |
| gkrellm-reminder | | GKrellM plugin to remind you of events |
| glclock | | OpenGL-based pocket watch |
| glista (V) | | Simple task list management utility |
| globe | | Display the currently-lighted face of Earth in ASCII |
| gnome-calendar | | Calendar application for GNOME |
| gnome-pomodoro | | Pomodoro timer for Gnome |
| gnutime | | Report user, system, and real time used by a process |
| gnyaclock | | Accessory with Bezier curve |
| grdc | | Grand digital clock from FreeBSD-current games |
| hebcal | | Perpetual Hebrew calendar |
| heirloom-date | | Collection of standard Unix utilities (date) |
| hs-clock | | High-resolution clock functions: monotonic, realtime, cputime |
| hs-hourglass | | Simple performant time related library |
| hs-old-time | | Time library |
| hs-text-iso8601 | | Converting time to and from ISO 8601 text |
| hs-time-compat | | Compatibility package for time |
| hs-time-locale-compat | | Compatibility module for time-format locale |
| hs-time-manager | | Scalable timer |
| hs-timezone-olson | | Pure Haskell parser and renderer for binary Olson timezone files |
| hs-timezone-series | | Enhanced timezone handling for Data.Time |
| hs-unix-time | | Unix time parser/formatter and utilities |
| ical | | Calendar application |
| ical2rem | | Convert iCal files to remind format |
| jday | | Julian date calculator |
| kalarm | | Personal alarm scheduler |
| kcalendarcore | | KDE calendar access library |
| kcalutils | | KDE calendar access library |
| kf6-kcalendarcore | | KDE calendar access library |
| kf6-kholidays | | KDE library for regional holiday information |
| khal | | CLI calendar application built around CalDAV |
| khard-git (V) | | Console carddav client |
| kholidays | | KDE library for regional holiday information |
| korganizer | | Calendar and scheduling Program |
| kronolith | | Horde calendar application |
| ktimer | | KDE countdown launcher |
| leapsunpack | | Creates libtai leapsecs.dat from compressed table |
| libical | | Reference implementation of the iCalendar data type and format |
| lmclock | | Hard-coded Xerox Lisp machine clock clone |
| logtime | | Prints date and time in a standard format |
| lua-chronos | | High resolution monotonic timers for Lua |
| lua-date | | Date and Time module for Lua 5.x |
| lua-tz | | Lua library for time and date manipulation |
| memo | | A simple memo tool written in bash |
| ntimed-git (V) | | Network Time Synchronization |
| ntpsec | | Hardened & improved NTP implementation derived from NTP Classic |
| ocaml-calendar | | OCaml library managing dates and times |
| ocaml-mirage-clock | | Portable clock implementation |
| ocaml-mtime | | Monotonic wall-clock time for OCaml |
| ocaml-time_now | | Library that reports the current time |
| ocaml-timezone | | Library for time zone handling |
| oclock | | Simple analog clock to make a round window |
| org-caldav-git (V) | | Caldav sync for Emacs Orgmode |
| p5-Business-Hours | | Calculate business hours in a time period |
| p5-Calendar-Simple | | Perl extension to create simple calendars |
| p5-Convert-NLS_DATE_FORMAT | | Convert Oracle NLS_DATE_FORMAT <-> strftime Format Strings |
| p5-Data-ICal | | Generates iCalendar (RFC 2445) calendar files |
| p5-Data-ICal-DateTime | | Convenience methods for using Data::ICal with DateTime |
| p5-Date-Extract | | Perl 5 module to extract probable dates from strings |
| p5-Date-ICal | | Perl extension for ICalendar date objects |
| p5-Date-Leapyear | | Is a particular year a leap year? |
| p5-Date-Range | | Date::Range - deal with a range of dates |
| p5-DateTime | | Perl module for date/time sets and ranges |
| p5-DateTime-Calendar-Discordian | | Perl extension for the Discordian Calendar |
| p5-DateTime-Calendar-Julian | | Dates in the Julian calendar |
| p5-DateTime-Calendar-Mayan | | The Mayan Long Count, Haab, and Tzolkin calendars |
| p5-DateTime-Event-Cron | | DateTime extension to handle crontab entries |
| p5-DateTime-Event-ICal | | DateTime extension for computing rfc2445 recurrences |
| p5-DateTime-Event-Random | | DateTime extension for creating random datetimes |
| p5-DateTime-Event-Recurrence | | DateTime::Set extension to create basic recurrence sets |
| p5-DateTime-Format-Builder | | Create DateTime parser classes and objects |
| p5-DateTime-Format-CLDR | | Parse and format CLDR, Common Locale Date Repository, time patterns |
| p5-DateTime-Format-DateManip | | Convert Date::Manip dates and durations to/from DateTimes |
| p5-DateTime-Format-DateParse | | Parses Date::Parse compatible formats |
| p5-DateTime-Format-Epoch | | Convert DateTimes to/from epoch seconds |