Nic Shulver, Date and Time in JSP Surely it must be easy? Many calendars exist. The year 2013 (“Gregorian” or “Western”) is also:

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Presentation transcript:

Nic Shulver, Date and Time in JSP Surely it must be easy? Many calendars exist. The year 2013 (“Gregorian” or “Western”) is also: 6763, Assyrian 1420, Bengali 5773–5774, Hebrew 12013, Holocene (Geologist’s calendar) 1434–1435, Islamic – , Unix…

Nic Shulver, Date and Time in JSP How do they work? Most calendars are solar (and lunar) – so there are about 365 days in a year. Gregorian: 365 days 5 hours 49 minutes 12 seconds on average! “Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100; …centurial years that are exactly divisible by 400 are still leap years.” Introduction to CalendarsIntroduction to Calendars, 13 September 2007, United States Naval Observatory.

Nic Shulver, Date and Time in JSP Date is time, Calendar is date... The Gregorian calendar provides the standard calendar system used by most of the world The java.util.GregorianCalendar() class provides a lot of date-related functionality The java.util.Date class Date represents a specific instant in time, with millisecond precision It used to handle date and time, but the Calendar classes do dates much better

Nic Shulver, Date and Time in JSP Code Example <% java.util.Calendar currDate = new java.util.GregorianCalendar(); // add 1 to month as Calendar's months start at 0, not 1 int month = currDate.get(currDate.MONTH)+1; int day = currDate.get(currDate.DAY_OF_MONTH); int year = currDate.get(currDate.YEAR); %> The current date is: / / See:

Nic Shulver, Date and Time in JSP Time since the Epoch In the Unix world, time started on the 1 st January, This is called “the epoch” It's just a convenient way to measure elapsed time GregorianCalendar class: computeTime() - “Converts calendar field values to the time value (millisecond offset from the Epoch)”

Nic Shulver, Date and Time in JSP Date object with locales Date Tester

Nic Shulver, Date and Time in JSP Date object with locales <% Date today = new Date(); Locale here = request.getLocale(); DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT,here); out.print( " Local date: "+ df.format( today ) ); Locale france = new Locale( "fr","FR" ); df=DateFormat.getDateInstance( df.LONG, france ); out.print( " French date: "+ df.format( today ) );

Nic Shulver, Date and Time in JSP Date object with locales Locale germany = new Locale( "de","DE" ); df=DateFormat.getDateInstance( df.LONG, germany ); out.print( " German date: "+ df.format( today ) ); Locale usa = new Locale( "en","US" ); df=DateFormat.getDateInstance( df.LONG, usa ); out.print( " USA date: "+ df.format( today ) ); %>

Nic Shulver, Date and Time in JSP The DateFormat class Today is <% DateFormat df = DateFormat.getDateInstance(DateFormat.FULL); Date today = new Date(); String msg = df.format(today); out.println(msg); %>

Nic Shulver, Date and Time in JSP Links to developer documents Gregorian Calendar docs: i/java/util/GregorianCalendar.html Date class docs: i/java/util/Date.html

Nic Shulver, Date and Time in JSP More useful links SimpleDateFormat class docs: i/java/text/SimpleDateFormat.html A proposal for “Earth Standard Time”: