• Have year on 4 digits from a Date object
• Get the current Date and Time
• Compute days between 2 dates
• Get the number of days in a month
• Validate a date
• Determine the day of the week
• Add/Substract Day/Month/Year to a Date
• Get the correct TimeZone on DateFormat
• Simply format a date as "YYYYMMDD"
• Compare 2 dates
• Parse a String to obtain a Date/GregorianCalendar object
• Use System time to generate unique ID
• Get the day name
• Find the date format pattern
• Get a julian date
• Calculate the age
• Format a duration in milliseconds into a human-readable format
• Get the atomic time
• Get a date interval
• Determine if a given hour is between an interval
• Set the computer clock (JNI)
• Get unique numerical id based on the system time
• Get the month (or day) name (localized)
• Detect a leap year

Date and Time HowTo

Written and compiled by Réal Gagnon ©1998-2010
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