History of Java 1. Java is a general purpose object oriented programming  language. 2. Developed by Sun Microsystems. (James Gostling) 3. Initially called “Oak” but was renamed as “Java” in 1995. 4. Initial motivation is to develop a pl...

Java Converting Epoch Seconds to DMYHMS Problem You need to convert a number of seconds since 1970 into a Date . Solution Just use the Date constructor. Explained “The Epoch” is the beginning of time as far as modern operating systems go....

Java Parsing Strings into Dates Problem You need to convert user input into Date or Calendar objects. Solution Use a DateFormat . Explained The DateFormat class introduced in Recipe 6.2 has some additional methods, notably parse( ) , whic...

Java Converting YMDHMS to a Calendar or Epoch Seconds Problem You have year, month, day, hour, minute, and maybe even seconds, and you need to convert it to a Calendar or a Date . Solution Use the Calendar class’s set(y,m,d,h,m[,s]) metho...

Java Representing Dates in Other Epochs Problem You need to deal with dates in a form other than the Gregorian Calendar used in the Western world. Solution Download the IBM calendar classes. Explained The only nonabstract Calendar subclas...

Java printing Date/Time in a Given Format Problem You want to print the date and/or time in a locale-sensitive or otherwise-specified format. Solution Use java.text.DateFormat . Explained To print the date in the correct format for wha...