Calendar FAQ, v. 2.0 (modified 11 Nov 1998) Part 1/3

sci.math FAQ: Day of Week

Y2K and Other Software Noncrises ( Robert L. Glass ; IEEE Software Magazine 2000-03)

Some Strategic Y2K Blessings ( Leon A. Kappelman ; IEEE Software Magazine 2000-03)

Guest Editors' Introduction: Fresh from Y2K, What's Next for Cobol? ( Edmund C. Arranga, Wilson Price ; IEEE Software Magazine 2000-03)

A Model for Software Practices from the Accounting Profession ( Bryan Kocher ; IEEE Software Magazine 2000-01)

Protecting Yourself from Y2K Questionnaires ( Trinidad Arriola-Kern ; IEEE Software Magazine 1999-05)

The Euro, Y2K, and the US Software Labor Shortage ( Capers Jones ; IEEE Software Magazine 1999-05)

Y2K Countdown to Certification ( Steve McConnell ; IEEE Software Magazine 1999-05)

Diary of a Y2K Consultant: Bracing for the Millennium ( ; IEEE Computer Magazine 1999-01)

MANAGING A Y2K PROJECT-STARTING NOW ( James E. Schultz ; IEEE Software Magazine 1998-05)

Y2K: Don't Play It Again, Sam ( James Sanders ; IEEE Software Magazine 1998-05)

A Visualization Tool for Y2K ( Stephen G. Eick ; IEEE Computer Magazine 1998-010)

Employment in 1998: Focus on Y2K and the Internet ( Lee Garber ; IEEE Computer Magazine 1998-01)

A Resource Guide to Year 2000 Tools ( Nicholas Zvegintzov ; IEEE Computer Magazine 1997-03)

Dealing with Dates: Solutions for the Year 2000 ( Robert A. Martin ; IEEE Computer Magazine 1997-03)

Requirements for Advanced Year 2000 Maintenance Tools ( Philip H. Newcomb, Melvin Scott ; IEEE Computer Magazine 1997-03)

How can I get the time of day in a C program? []

How can I convert a struct tm or a string into a time_t? []

How can I perform calendar manipulations? []

Marking Time - Controlling a Noisemaker from a PC? [2002/04/26]

Where are the iCalendar Servers? [2001/11/15]

What is the difference between GMT and UTC? [ 2000/02/01]

How do I change the timezone used by just one program (like xclock)? [ 2000/02/01]

How can I keep my dialin system time automatically synchronised? [ 2000/02/01]

How can I keep my isolated system time automatically synchronised? [ 2000/02/01]

How do I set my entire system's time zone? [ 2000/02/01]

Why, when I boot into Windows (or some other OS), is its clock off by some integer number of hours? [ 2000/02/01]

What's the incantation to get BSD and Windows to share my PC's clock properly? [ 2000/01/01]

Questions and Answers

calendar(1) - reminder service {oss}

cal(1) - displays a calendar {oss}

date(1) - display or set date and time {oss}

zdump(8) - time zone dumper {oss}

zic(8) - time zone compiler {oss}

rdate(8) - set the system's date from a remote host {oss}

timed(8) - time server daemon {oss}

timedc(8) - timed control program {oss}

Teatime - Teatime is a tea-drawing-time-observer-applet for the gnome-panel {(L)GPL}

X Beats clock - A beats clock dockable in both Window Maker and AfterStep. It can also run in its own window. {(L)GPL}

mcountd - The intention of this program is to provide an extremely simple count down clock to a specific date and time using large numbers in "ASCII-art". {(L)GPL}

gcal - is a program for printing calendars. It displays different styled calendar sheets, eternal holiday lists, and fixed date warning lists. {GPL,GNU}

gemcal-20020411 - Calender program for MHC

p5-Astro-Sunrise-0.05 - Perl extension for computing the sunrise/sunset on a given day

p5-Date-DayOfWeek-1.21 - Determine the day of the week for any date

wmclock-1.0.12.2 - A dockable clock applet for Windowmaker

datedif-0.9.1.4 - Calculates the number of days between two dates

wmfishtime-1.23 - A time/date applet for WindowMaker with fishes swimming around

p5-Tk-Date-0.36 - Tk::Date - a date/time widget for perl/Tk

pscal-1.15 - A utility for generating Postscript calendars

bigyear-20010226,1 - A program to print a large (one month per page) calendar

sscalc-1.0 - A sunrise/sunset time calculator

abclock-1.0a - Clock for X that displays hours and minutes in an analog fashion

asclock-gtk-2.1.10 - New flavor of asclock (GTK version)

asclock-xlib-2.0.11 - New flavor of asclock

bbdate-0.2.1 - A tool made for Blackbox that displays the date in a decorated window

ja-kpcal-2.0_1 - Make Calendar in Postscript format

jday-1.2 - Convert calendar dates to and from astronomical julian dates

p5-Date-Calc-4.3 - Gregorian calendar date calculations

pclock-0.13.1 - Simple analog clock program for the Window Maker dock

ruby-date2-3 - An alternative date class for Ruby

sanduhr-0.3.52 - An alarm clock for GNOME desktop designed as a sand-glass

tclock-1.0.1 - Transparent analog clock for x11

wmCalClock-1.25 - Another Window Maker calendar/clock dockapp

wmdate-0.7 - Date app for the WindowMaker dock

wmtz-0.7 - Dockapp that displays the time in different time zones

xtu-1.1 - Transparent analog clock for X11

wmsun-1.03 - A dockapp that displays the rise and set time of the sun

p5-Astro-SunTime-0.01 - Perl interface to calculate sunrise/sunset times

ruby-calendar-1.10.3r - Ruby modules to handle various calendars

mcal-0.3 - A libmcal powered cal replacement

pcal-4.7 - PostScript calendar program

gkrellm-reminder-0.3.5 - GKrellM plugin that reminds you of important events

gmcal-0.0.1 - GMCAL is a GTK+ frontend for the libmcal package

kronolith-0.0.3.011209_1 - Kronolith is the Horde calendar application

xmms-alarm-0.3.1 - Alarm timer plugin for the X Multimedia System

zclock-1.0 - A simple but powerful clock applet for GNOME

zh-lunar-2.1 - Convert between Gregorian Solar Calendar (SC) and Lunar Calendar (LC)

cal-3.5 - Enhanced color version of standard calendar utility

ical-2.2 - A calendar application.

plan-1.8.4 - An X/Motif schedule planner with calendar

xcalendar-4.0 - A calendar with a notebook for X11 (internationarized version) [X]

bclock-1.0 - A round, analog X11 clock with bezier curve hands. [X]

dclock-pl6 - A 7-segment digital clock with optional military time and alarm

emiclock-2.0.2 - Hyper-animated face analog clock for X11

eyeclock-2.0 - A clock with eyes following the mouse pointer

mlclock-1.1 - Clock for mlvwm window manager

mouseclock-1.0 - display the current time using the X root cursor

rclock-2.7.3 - Analog clock for X w/appointment reminder and mail notification

swisswatch-0.06 - A Swiss railway clock emulation, and a fancy default appearance. [X]

t3d-1.1 - Clock using flying balls to display the time. [X]

wmtime-1.0b2 - Time/Date applet for WindowMaker. [X]

xalarm-3.06 - An X based alarm clock. [X]

xtimer-0.8089 - A simple digital timer for X11

datediffs - patches for date to use elsie!ado's localtime {oss}

settz.patch - Updates to "settz" data files {oss}

pd-localtime - Public Domain (Table Driven) ``localtime'' {oss}

reminders - A Personal Reminder system {oss}

nag - Nag reminder service {oss}

tmac - travel-itinerary macros for nroff {oss}

yearlength - Compute length of any year {oss}

emitc - Routine to process ctime(3) output {oss}

pd-localtime - Public Domain (Table Driven) ``localtime'' {oss}

posix-date - implementation of posix date(1) and strftime(3) {oss}

strftime - convert date and time to string (includes "date") {oss}

tm_to_time - Convert broken-down time into time_t. {oss}

nisttime - Set the system clock to the NIST master clock {oss}

settime - Set system time from atomic clock {oss}

srsi - Program to remind you to take a typing break {oss}

KOrganizer - Personal Information Manager for the KDE Desktop Environment {x,GPL}

asclock-itime - A port of asclock to show the recently announced Internet Time format {x,GPL}

XDaliClock - Digital clock for the X Window System {x,BSL}

clock - Sets system time from CMOS clock and vice versa. {GPL}

Wcal - Web based calendar/planner especially suitable for multi-user setups {GPL}

Date::Calc - Package for all kinds of date calculations based on the Gregorian calendar {GPL}

Xwrits - Reminds you to take wrist breaks {x,GPL}

Remind - calendar/remind program with scripting. Supports Hebrew calendar and postscript output too. {x,GPL}

xbeats - A beats clock dockable in the windowmaker dock {x,GPL}

WMitime - A clock for the Windowmaker/Afterstep dock {x,GPL}

jbc - Displays the time in BCD (Binary Coded Decimal) {x,GPL}

Log.C - Utility to log working time {oss}

p5-DateManip-5.39.tgz - manipulate dates in perl

dclock-pl4.tgz - digital clock with optional military time and alarm

calentool-2.3.tgz - nice X11-based calendar/scheduling tool (using XView)

XCclock - Offers a nice clock and an alarm function [X] {GPL}

astime-2.6 - Time/Date applet for WindowMaker

Kalendar - simple, easy to use calendar and to-do list manager [X] {GPL}

ocscal - An intranet calendar system featuring shared appointments {GPL}

Applications and Utilities

asctime ctime difftime gmtime localtime mktime (3) - convert date and time to ASCII {oss}

ftime (3) - get date and time {oss}

time (3) - get time of day {oss}

time2posix posix2time (3) - convert seconds since the Epoch {oss}

timezone (3) - return the timezone abbreviation {oss}

tzset (3) - initialize time conversion information {oss}

adjtime (2) - correct the time to allow synchronization of the system clock {oss}

clock_gettime clock_settime clock_getres (2) - get/set/calibrate date and time {oss}

gettimeofday settimeofday (2) - get/set date and time {oss}

p5-Class-Date-1.0.8 - A Perl class for easy date and time manipulation

p5-DateConvert-0.16 - Perl5 module to convert dates between any two calendrical formats

p5-HTML-CalendarMonthSimple-1.07 - HTML::CalendarMonthSimple - Perl Module for Generating HTML Calendars

libmcal-0.6_2 - Modular Calendar Access Library

p5-Time-Period-1.20 - A perl module that contains code to deal with time periods

p5-Date-Chinese-1.03 - Perl module to calculate dates in the Chinese calendar

p5-Date-Manip-5.40 - Perl5 module containing date manipulation routines

p5-Time-101.062101 - A collection of functions to convert and use time variables in perl5

p5-TimeDate-1.10 - Perl5 module containing a better/faster date parser for absolute dates

Ftime.H,Ftime.C - BC++-style file date/time struct functions {oss,msdos}

Dspclock.C - On-screen TSR clock {oss}

Scaldate.H,Scaledate.C - Scalar ("Julian") date functions {oss}

Daynum.C - Return statistics about a given date {oss}

Isdst.C - Determine if a given date is in Daylight Savings Time {oss}

Today.C - Return today's date as a scalar value {oss}

Dow.C - Return day of the week for any date {oss}

Fdate.C - Return DOS file date as a scalar value {oss}

Cal.C - Calendar using Scaldate.C {oss}

Jdn_L.C - Long integer Julian Day Number computation {oss}

Addtime.C - Add two times (hh:mm:ss) together, normalizing the result {oss}

Easter.C - Determine the date of Easter in any given year {oss}

Parsdate.C - Parse a date string {oss}

Parstime.C - Parse a time string {oss}

Strftime.H,strftime.C - Non-locale version of ANSI/ISO strftime() {oss}

Date.Hpp, Date.Cpp, zDate.Man, datedemo.cpp - Branislav Slantchev's zDate class library {oss}

David Nugent's time functions class (a C++ wrapper for ANSI/ISO struct tm) - Formatting functions {oss}

Ftime.H,Ftime.C - BC++-style file date/time struct functions {oss}

Clock.H - Add clock() to older compilers without it {oss}

Tc15.H - Demo of portability header for older compiler (TC 1.5) {oss}

Date__.C - Convert a date string from __DATE__ to ISO format {oss}

Time__.C - Convert a time string from __TIME__ to standard format {oss}

Dspclock.C - On-screen TSR clock {oss,msdos}

emitc - Routine to process ctime(3) output {oss}

localtime - Public time (zone) conversion routines {oss}

posix-date - implementation of posix date(1) and strftime(3) {oss}

strftime - yet another strftime(3) and date(1) {oss}

tm_to_time - convert broken-down time into time_t. {oss}

Delay - Delay is like sleep, but with a count of time left. {GPL}

BSD::Time - Implements the gettimeofday() and settimeofday() functions. [Perl] {oss}

Date::Convert - Converts between Gregorian, Julian, Hebrew, and astronomical date formats. [Perl] {oss}

Date::GetDate - Get the current date, accounting for time zones. [Perl] {oss}

Date::DateCalc - Calculates the difference between two dates, or a specified offset from a single date. [Perl] {oss}

Date::Format - Date formatting routines that convert dates into ASCII strings. In the Date/TimeDate package. [Perl] {oss}

Date::Language - Converts dates into different languages. Date::Language is part of the Date/TimeDate package. [Perl] {oss}

Date::Parse - Converts date strings into Unix time values. (A Unix time value is the number of seconds since January 1, 1970.) [Perl] {oss}

The Time-Modules Bundle - Contains Time::CTime, Time::JulianDay, Time::ParseDate, Time::Timezone, and Time::DaysInMonth. See their individual listings for further details. [Perl] {oss}

The TimeDate Bundle - Contains Date::Format, Date::Language, Date::Parse, and Time::Zone. See their individual listings for further details. [Perl] {oss}

Time::CTime - Format times in many different ways. Part of the Time-modules bundle. Also see the POSIX module. [Perl] {oss}

Time::DaysInMonth - Determine the number of days in a month. It handles leap years, of course. Part of the Time-modules bundles. [Perl] {oss}

Time::JulianDay - Convert dates to/from the Julian calendar, which is the calendar most Western civiliations used prior to our current calendar, the Gregorian. In the Time-modules bundle. [Perl] {oss}

Time::ParseDate - Reverses strftime and also understands relative times. In the Time-modules bundle. [Perl] {oss}

Time::Period - Provides inPeriod(), which determines whether a certain point in time falls within a give period. [Perl] {oss}

Time::Timezone - Manipulates time zones. In the Time-modules bundle. Also see Time::Zone below. [Perl] {oss}

Time::HiRes - Finer granularity time, sleep, and alarm: implements usleep(), ularam(), and gettimeofday() in Perl. [Perl] {oss}

Net::Time - Obtains the time from a remote machine. Part of the libnet bundle. [Perl] {oss}

p5-Time-TimeDate-1.10.tgz - library for parsing and formatting dates and times

Time::Zone - Manipulates time zones. In the TimeDate bundle. Also see Time::Timezone above. [Perl] {oss}

Libraries and Functions

(The following links to subjects at this site retain your personalized selections.)

Up to Hardware Access - Gateway topic to hardware and real-time related processing routines.

X11-clocks - - X Window System based clocks.

(Metalab at UNC) /pub/linux/system/admin/time/ - utils for maintaining the system time

(Metalab at UNC) /pub/linux/X11/clocks/ - clocks and related alarm programs