| Radicale (V) | | CalDAV (calendar) and CardDAV (contact) server |
| abclock | | Analogue Bitmap Clock |
| 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 |
| cairo-clock | | Analog clock drawn with vector-graphics |
| cal | | Enhanced color version of standard calendar utility |
| cardboard-schedule | | Project and resource management software implemented in Java/Swing |
| catclock | | Variant of the MIT xclock with a cat mode |
| dates (V) | | Dates is a small, lightweight calenda |
| dclock | | Digital clock for X |
| 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 |
| etm | | Events and tasks manager using simple text files |
| evolution (V) | | GNOME mailer, calendar, contact manager, and communications tool |
| evolution-webcal | | GNOME URL handler for web-published iCal calendar files |
| gcal | | GNU version of the standard calendar utility |
| gchore | | Chore reminder tool with gtk UI |
| gdeskcal | | Desktop calendar |
| glclock | | OpenGL-based pocket watch |
| glista (V) | | Simple task list management utility |
| globe | | Display the currently-lighted face of Earth in ASCII |
| gnotime | | Time tracker for GNOME2 |
| gnutime | | Report user, system, and real time used by a process |
| gnyaclock | | Accessory with Bezier curve |
| grdc | | Grand digital clock from FreeBSD-current games |
| gtodo | | To-do list manager for the GNOME desktop |
| gtodo-applet | | GNOME applet for the gtodo application |
| hamster-applet | | Time tracking applet for GNOME |
| hebcal | | Perpetual Hebrew calendar |
| heirloom-date | | Collection of standard Unix utilities (date) |
| hijra (V) | | Hijra is the Hijri Islamic Calendar |
| ical | | Calendar application |
| ical2rem | | Convert iCal files to remind format |
| jday | | Julian date calculator |
| 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 |
| ocaml-calendar | | OCaml library managing dates and times |
| 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-ICal | | Perl extension for ICalendar date objects |
| p5-Date-Leapyear | | Is a particular year a leap year? |
| p5-Date-Range (V) | | 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-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-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 |
| p5-DateTime-Format-Flexible | | Flexibly parse strings and turn them into DateTime objects |
| p5-DateTime-Format-HTTP | | Deal with date formats used by HTTP |
| p5-DateTime-Format-ICal | | Parse and format iCal datetime and duration strings |
| p5-DateTime-Format-ISO8601 | | Parses ISO8601 formats |
| p5-DateTime-Format-Mail | | Convert between DateTime and RFC2822/822 formats |
| p5-DateTime-Format-MySQL | | Parse and format MySQL dates and times |
| p5-DateTime-Format-Natural | | Create machine readable date/time with natural parsing logic |
| p5-DateTime-Format-Oracle | | Parse and format Oracle dates and timestamps |
| p5-DateTime-Format-Pg | | Parse and format PostgreSQL dates and times |
| p5-DateTime-Format-SQLite | | Parse and format SQLite dates and times |
| p5-DateTime-Format-Strptime | | Perl 5 module to parse and format strp and strf time patterns |
| p5-DateTime-Format-W3CDTF | | Convert between DateTime and W3CDTF date/time format |
| p5-DateTime-Locale | | Localization data for p5-DateTime |
| p5-DateTime-Precise | | Perl module for common time and date operations with GPS ops |
| p5-DateTime-Set | | Perl module for date/time sets and ranges |
| p5-DateTime-TimeZone | | Perl module to handle time zone manipulation |
| p5-DateTime-TimeZone-HPUX | | Handles timezones defined at the operating system level on HP-UX |
| p5-DateTimeX-Easy | | Parse a date/time string using the best method available |
| p5-MooseX-Types-DateTime | | DateTime related constraints and coercions for Moose |
| p5-MooseX-Types-DateTime-ButMaintained | | DateTime related constraints and coercions for Moose |
| p5-MooseX-Types-DateTimeX | | Extensions to MooseX::Types::DateTime::ButMaintained |
| p5-Net-Google-Calendar | | Perl module for accessing Google calendars |
| p5-Olson-Abbreviations | | Perl extension for globally unique timezones abbreviation handling |
| p5-Rose-DateTime | | DateTime helper functions and objects for Rose |
| p5-Schedule-At | | OS independent interface to the Unix 'at' command |
| p5-Schedule-Cron-Events | | Perl module to find when crontab events will occur |
| p5-Template-Plugin-DateTime | | Template plugin to use DateTime objects |
| p5-Test-MockTime | | Replaces actual time with simulated time |
| p5-Time-Clock | | Twenty-four hour clock object with nanosecond precision |
| p5-Time-Duration | | Perl5 module for rounded or exact English expression of durations |
| p5-Time-Duration-Parse | | Perl5 module to parse string that represents time duration |
| p5-Time-Elapsed | | Displays the elapsed time as a human readable string |
| p5-Time-Format | | Easy-to-use date/time formatting |
| p5-Time-Format_XS | | Companion module for Time::Format, to speed up time formatting |
| p5-Time-HiRes | | Perl5 module for high resolution time, sleep, and alarm |
| p5-Time-Interval | | Converts time intervals of days, hours, minutes, and seconds |
| p5-Time-Local | | Efficiently compute time from local and GMT time |