Nicola L. C. Talbot
School of Computing Sciences
University of East Anglia
Norwich. NR4 7TJ.
United Kingdom.
http://theoval.cmp.uea.ac.uk/~nlct/
6th Feb 2010
Since version 2.4, the datetime package has been separated into two packages: datetime and fmtcount. When I originally created this package, I defined the commands, \ordinal etc which could be used in the definition of \today. Since then, I have extended the number of commands available that can be used to display the value of a LaTeX counter, however it seems more appropriate to define all these counter-related commands in a separate package. The fmtcount package is now distributed separately from the datetime package, and will also need to be installed.
As from version 2.42, the datetime package is now compatible with babel, however you must load the datetime package after the babel package. For example:
\usepackage[francais]{babel}
\usepackage{datetime}
ISO format:
The declaration \yyyymmdddate will redefine
\today to produce
the current date displayed in the form 2000/03/08. (You can
redefine \dateseparator to - to change to
2000-03-08.)
Day Month Year formats:
The declaration \longdate will redefine
\today to produce the current date displayed in the form
Wednesday 8th March, 2000
if the package option dayofweek is used, or
8th March, 2000 if the package option
nodayofweek is used.
The declaration \shortdate will redefine
\today to produce the current date displayed in the form
Wed 8th Mar, 2000 if the package option
dayofweek is used, or 8th Mar, 2000
if the package option nodayofweek is used.
The declaration \ddmmyyyydate will redefine
\today to produce
the current date displayed in the form 08/03/2000
The declaration \dmyyyydate will redefine
\today to produce
the current date displayed in the form 8/3/2000
The declaration \ddmmyydate will redefine
\today to produce
the current date displayed in the form 08/03/00
The declaration \dmyydate will redefine
\today to produce
the current date displayed in the form 8/3/00
The declaration \textdate will redefine
\today to produce the current date displayed in the form:
Wednesday the Eighth of March, Two Thousand if the package option
dayofweek is used, or Eighth of March, Two Thousand if
the package option nodayofweek is used. Note that
\textdate is defined for use with English, it won't
look right if it is used when another language has been
selected1. If you want to define a similar command for
another language, you will first need to check that the
fmtcount package supports that language.
Month Day Year formats:
The declaration \usdate will redefine
\today to produce the current date displayed in the form
March 8, 2000. (As TeX and LaTeX do by default.)
The declaration \mmddyyyydate will redefine
\today to produce the current date displayed in the form
03/08/2000
The declaration \mdyyyydate will redefine
\today to produce the current date displayed in the form
3/8/2000
The declaration \mmddyydate will redefine
\today to produce the current date displayed in the form
03/08/00
The declaration \mdyydate will redefine
\today to produce the current date displayed in the form
3/8/00
In addition, the declarations \datelang are
available for all languages defined either by
calling babel prior to datetime or by
passing the language name as an option to datetime.
See later
if you want to define your own customised date format.
As from version 2.43, the numerical date formats (such as
\ddmmyyyydate) use the command
\dateseparator to separate the numbers. So, for example,
if you want to hyphens instead of slashes, you can do:
\renewcommand{\dateseparator}{-}
\currenttime.
A specific time can be displayed using the command \formattime{hour}{minute}{second}, where hour is a number from 0 to 23, and minute and second are numbers from 0 to 59.
The format can be changed using the declaration \settimeformat{style}, where style is the name of the format. Predefined formats are:
New time formats can be defined using the command:
\newtimeformat{name}{format}
where name is the name of the new format (used in
\settimeformat), and format is how to format the
time. Within format you can use the counters
HOUR (number of hours after midnight), MINUTE
(number of minutes past the hour), SECOND (number of
seconds) HOURXII (number of
hours after midnight/midday), TOHOUR (the next hour) and
TOMINUTE (number of minutes to the next hour), and the
corresponding commands: \THEHOUR, \THEMINUTE, \THESECOND,
\THEHOURXII, \THETOHOUR and \THETOMINUTE.
For example, to define a new time format that uses a dot instead of a colon:
\newtimeformat{dottime}{\twodigit{\THEHOUR}.\twodigit{\THEMINUTE}}
You then need to switch to this new format before you can use it:
\settimeformat{dottime}
\currenttime
As from version 2.43, if you only want to change the separator, you can simply redefine \timeseparator instead of defining a new time format. For example:
\renewcommand{\timeseparator}{.}
The xxivtime format will now work like the dottime
format defined above.
\pdfdate2 prints the date in the format required for
PDF files, e.g. if the date is 1 May 2004 and time is
22:02, \pdfdate will print 20040501220200. The reason
this date format is separate from all the others is because the
other form doesn't get properly expanded by PDFTeX. (This
command is defined regardless of whether the package option
nodate is called.)
Example:
\pdfinfo{
/Author (Me)
/Title (A Sample Document)
/CreationDate (D:20040501215500)
/ModDate (D:\pdfdate)
}
Note that PDFTeX introduced the new primitive
\pdfcreationdate in version 1.30.0, so \pdfdate isn't
required with newer versions of PDFTeX. (\pdfcreationdate
is better than \pdfdate as it also stores the time zone.)
There are two commands that print the name of the current
month:
\monthname prints the current month name in full,
e.g. August, and
\shortmonthname prints the abbreviated month name,
e.g. Aug. Both \monthname and
\shortmonthname take an optional argument (a number from
1 to 12) if the name of a specific month is required. For
example, \monthname[6] will produced the output: June.
The day of the week is computed using the algorithm documented at http://userpages.wittenburg.edu/bshelburne/Comp150/DayOfWeek.htm. This algorithm works for any date between 1st Jan, 1901 and 31st Dec, 2099. The following macros display the day of week for a given date:
\dayofweekname{day}{month}{year} prints the
day of week for the specified date. For example,
\dayofweekname{31}{10}{2002}
will produce the output: Thursday.
\shortdayofweeknameday{month}{year} prints the
abbreviated name for the
day of week for the specified date. For example
\shortdayofweekname{31}{10}{2002}
will produce the output: Thu.
The TeX conditional \ifshowdow can be used to determine
whether or not the option dayofweek has been passed to
the package.
For example:
\ifshowdow\dayofweekname{31}{10}{2002} \fi
will only display the day of week if the dayofweek
option was passed to datetime.
Alternatively, you can use David Carlisle's ifthen
package:
\ifthenelse{\boolean{showdow}}{\dayofweekname{31}{10}{2002} }{}
The command \ordinaldate{number} displays number as a date-type ordinal. If the current language is English, this will simply pass the argument to \ordinalnum (defined in the fmtcount package), if the current language is Breton, Welsh or French, a superscript will only be added if number is 1, otherwise only number will be displayed.
The macro
\formatdate{day}{month}{year}3 formats the specified date according to
the current format of \today4.
(Arguments must all be integers.) For example, in combination with
\longdate, the command
\formatdate{27}{9}{2004}
will produce the output: Monday 27th September,
2004.
You can ensure that a number is displayed with at least two digits by using the command \twodigit{num}. This is of use if you want to define your own date or time formats.
New date formats can be defined using the command:
\newdateformat{name}{format}
where name is the name of the new format, and
format is how to format the date. Within the
argument format you can use the commands \THEDAY,
\THEMONTH
and \THEYEAR to represent the relevant day, month and
year, or you can use the counters
DAY, MONTH and YEAR if you want to
use \ordinal etc. Once you have defined the
new date format, you can then switch to it using the declaration
\name
(i.e. the name you specified preceded by a backslash), and
subsequent calls to \today and \formatdate will
use your new format.
For example, suppose you want to define a new date format called, say, mydate, that will typeset the date in the form: 8-3-2002, then you can do:
\newdateformat{mydate}{\THEDAY-\THEMONTH-\THEYEAR}
\newdateformat will then define the declaration
\mydate which can be used to
switch to your new format. In the following example,
two new date formats are defined, and they are then
selected to produce two different formats for the current date:
\newdateformat{dashdate}{%
\twodigit{\THEDAY}-\twodigit{\THEMONTH}-\THEYEAR}
\newdateformat{usvardate}{%
\monthname[\THEMONTH] \ordinal{DAY}, \THEYEAR}
Dash: \dashdate\today.
US: \usvardate\today.
If the current date is, say, 8th March, 2002, the above code will
produce the following:
Dash: 08-03-2002.
US: March 8th, 2002.
Note that \THEDAY etc and DAY etc have no real meaning outside \newdateformat (this is why they are in uppercase). Incidentally, the dashdate format is not really necessary, as you can achieve this format using:
\renewcommand{\dateseparator}{-}
\ddmmyyyydate
Another note: in the above code, \ordinal was used to illustrate the use of the DAY counter. It is better to use \ordinaldate instead:
\newdateformat{usvardate}{%
\monthname[\THEMONTH] \ordinaldate{\THEDAY}, \THEYEAR}
It is possible to save a date for later use using the command: 5
\newdate{name}{day}{month}{year}
This date can later be displayed using the same format as that used by \formatdate using the command:
\displaydate{name}
Individual elements of the date can be extracted using the commands:
\getdateday{name}
\getdatemonth{name}
\getdateyear{name}
The following commands are defined by the datetime package:
| Command Name | Default Value |
|---|---|
| \dateseparator | / |
| \timeseparator | : |
| \amname | am |
| \pmname | pm |
| \amorpmname | \amname if morning, otherwise \pmname |
| \amstring | in the morning |
| \pmstring | in the afternoon |
| \amorpmstring | \amstring if morning, otherwise \pmstring |
| \halfpast | Half past |
| \quarterpast | Quarter past |
| \quarterto | Quarter to |
| \noon | Noon |
| \midnight | Midnight |
| \oclockstring | O'Clock |
The following options may be passed to this package:
| long | make \today produce long date | |
| short | make \today produce short date | |
| yyyymmdd | make \today produce YYYY/MM/DD date | |
| ddmmyyyy | make \today produce DD/MM/YYYY date | |
| dmyyyy | make \today produce D/M/YYYY date | |
| ddmmyy | make \today produce DD/MM/YY date | |
| dmyy | make \today produce D/M/YY date | |
| text | make \today produce text date | |
| us | make \today produce US style date | |
| mmddyyyy | make \today produce MM/DD/YYYY date | |
| mdyyyy | make \today produce M/D/YYYY date | |
| mmddyy | make \today produce MM/DD/YY date | |
| mdyy | make \today produce M/D/YY date | |
| raise | make ordinal st,nd,rd,th appear as superscript | |
| level | make ordinal st,nd,rd,th appear level with rest of text | |
| dayofweek | make the day of week appear for \longdate, \shortdate | |
| or \textdate | ||
| nodayofweek | don't display the day of week. | |
| hhmmss | make \currenttime produce hhmmsstime format | |
| 24hr | make \currenttime produce xxivtime format | |
| 12hr | make \currenttime produce ampmtime format | |
| oclock | make \currenttime produce oclock format | |
| nodate | Don't redefine \today or define the month or day of week commands | |
| (useful if you only want the time commands) | ||
| iso | as ddmmyyyy and hhmmss but also sets date separator to - | |
| and time separator to : |
The default options are: long, raise, dayofweek and 24hr.
If you use the ngerman package, you must use datetime's ngerman package option if you want the date displayed in the same form as ngerman. You must also load ngerman before you load datetime. Similarly for the german package.
If you want to use the babel package, you must load it before you load the datetime package. This is because the babel \datelang commands redefine \today, whereas the datetime package redefines \today to use \formatdate, and the date formatting commands (such as \longdate) redefine \formatdate rather than \today. This ensures consistent formatting of the dates whether you use \today or \formatdate. Therefore, the datetime package has to redefine all the \datelang commands accordingly. Thus the multilingual date support is mostly limited to that provided by babel. Additional support, such as the day of week names and abbreviations, are only supplied for those languages that I know, or that other people have been able to supply for me.
As from v2.56, the package options supplied to datetime override babel's date format. For example:
\usepackage[french,spanish]{babel}
\usepackage[ddmmyyyy]{datetime}
will use ddmmyyyy date format regardless of language. Note that
if you use a declaration instead of a package option, for
example:
\usepackage[french,spanish]{babel}
\usepackage{datetime}
\ddmmyyyydate
the date format will be switched back to \datefrench or
\datespanish whenever the language is set. You can use
\setdefaultdate{declaration}
to always use {declaration} whenever the language is set. For example:
\setdefaultdate{\ddmmyyyydate}
The commands \monthname and \shortmonthname,
will produce the month name in the current language.
If you want the month name in a specific language, you
can use the command \monthnamelang.
For example, \monthnamefrench[6] will produce the output:
juin. Note that \textdate is formatted for English dates,
and won't look right if used with another language setting. If you
want a textual date, the fmtcount package (which is
loaded by datetime) defines some commands which display
a number or ordinal as a word, but it only has very limited
multilingual support. See the fmtcount documentation
for further details.
There is currently only limited multilingual support for \dayofweekname and \shortdayofweekname (just English, French, Portuguese, Spanish and German6). You can add support for other languages by defining the commands \dayofweeknameidlang and \shortdayofweeknameidlang. Note that these commands only take one argument which should be a number from 1 to 7 indicating the day of the week.
You can use the following as templates. Replace english with the name of your language (as given by \languagename) and replace Sunday etc as appropriate:
\providecommand*{\dayofweeknameidenglish}[1]{%
\ifcase#1\relax
\or Sunday%
\or Monday%
\or Tuesday%
\or Wednesday%
\or Thursday%
\or Friday%
\or Saturday%
\fi}
\providecommand*{\shortdayofweeknameidenglish}[1]{%
\ifcase#1\relax
\or Sun%
\or Mon%
\or Tue%
\or Wed%
\or Thu%
\or Fri%
\or Sat%
\fi}
If you want them added to future versions of
datetime, please email me the code.
TeX provides \day, \month, \year registers. In addition, datetime provides the registers: \currenthour, \currentminute and \currentsecond. Note that old distributions of TeX will always have \currentsecond set to zero.
As from Version 2.4, the datetime package will read in settings from the configuration file datetime.cfg, if it exists, which will override the default package options. For example, suppose you prefer a short date without the day of week by default, you will need to create a file called datetime.cfg that contains the line:
\shortdate\showdowfalseThe file datetime.cfg should then go somewhere on the TeX path. Now all you need to do is:
\usepackage{datetime}
without having to specify the short and
nodayofweek options.
You can also use this file to define and set your own date styles. For example, you could create a configuration file that has the following lines:
\newdateformat{dashdate}{\twodigit{\THEDAY}-\twodigit{\THEMONTH}-\THEYEAR}
\dashdate
Whenever you use the datetime package, it will now
use this format by default.
Version 2.43 and above of the datetime bundle supplies the LaTeX2HTML style file datetime.perl. This file should be placed in a directory searched by LaTeX2HTML. The following limitations apply to the LaTeX2HTML styles:
\usepackage{datetime}
\html{\input{datetime.cfg}}
This, I agree, is an unpleasant cludge.
There is a datetime FAQ available at: http://theoval.cmp.uea.ac.uk/~nlct/latex/packages/faq/
\pdfdate2