Package org.apache.tools.ant.util

Class DateUtils

java.lang.Object
org.apache.tools.ant.util.DateUtils
public final class DateUtils extends Object
Helper methods to deal with date/time formatting with a specific defined format (ISO8601) or a correct pluralization of elapsed time in minutes and seconds.
Since:
Ant 1.5

  • Field Details

    • ISO8601_DATETIME_PATTERN

      public static final String ISO8601_DATETIME_PATTERN
      ISO8601-like pattern for date-time. It does not support timezone. yyyy-MM-ddTHH:mm:ss
      See Also:

    • ISO8601_DATE_PATTERN

      public static final String ISO8601_DATE_PATTERN
      ISO8601-like pattern for date. yyyy-MM-dd
      See Also:

    • ISO8601_TIME_PATTERN

      public static final String ISO8601_TIME_PATTERN
      ISO8601-like pattern for time. HH:mm:ss
      See Also:

    • DATE_HEADER_FORMAT

      @Deprecated public static final DateFormat DATE_HEADER_FORMAT
      Deprecated.
      DateFormat is not thread safe, and we cannot guarantee that some other code is using the format in parallel. Deprecated since ant 1.8
      Format used for SMTP (and probably other) Date headers.

    • EN_US_DATE_FORMAT_MIN

      public static final ThreadLocal<DateFormat> EN_US_DATE_FORMAT_MIN
      Provides a thread-local US-style date format. Exactly as used by <touch>, to minute precision: SimpleDateFormat("MM/dd/yyyy hh:mm a", Locale.US)
      Since:
      Ant 1.10.2

    • EN_US_DATE_FORMAT_SEC

      public static final ThreadLocal<DateFormat> EN_US_DATE_FORMAT_SEC
      Provides a thread-local US-style date format. Exactly as used by <touch>, to second precision: SimpleDateFormat("MM/dd/yyyy hh:mm:ss a", Locale.US)
      Since:
      Ant 1.10.2

  • Method Details

    • format

      public static String format(long date, String pattern)
      Format a date/time into a specific pattern.
      Parameters:
      date - the date to format expressed in milliseconds.
      pattern - the pattern to use to format the date.
      Returns:
      the formatted date.

    • format

      public static String format(Date date, String pattern)
      Format a date/time into a specific pattern.
      Parameters:
      date - the date to format expressed in milliseconds.
      pattern - the pattern to use to format the date.
      Returns:
      the formatted date.

    • formatElapsedTime

      public static String formatElapsedTime(long millis)
      Format an elapsed time into a pluralization correct string. It is limited only to report elapsed time in minutes and seconds and has the following behavior.
      • minutes are not displayed when 0. (ie: "45 seconds")
      • seconds are always displayed in plural form (ie "0 seconds" or "10 seconds") except for 1 (ie "1 second")
      Parameters:
      millis - the elapsed time to report in milliseconds.
      Returns:
      the formatted text in minutes/seconds.

    • getPhaseOfMoon

      public static int getPhaseOfMoon(Calendar cal)
      Calculate the phase of the moon for a given date.

      Code heavily influenced by hacklib.c in Nethack

      The Algorithm: 

       moon period = 29.53058 days ~= 30, year = 365.2422 days

 days moon phase advances on first day of year compared to preceding year
  = 365.2422 - 12 * 29.53058 ~= 11

 years in Metonic cycle (time until same phases fall on the same days of
  the month) = 18.6 ~= 19

 moon phase on first day of year (epact) ~= (11*(year%19) + 18) % 30
  (18 as initial condition for 1900)

 current phase in days = first day phase + days elapsed in year

 6 moons ~= 177 days
 177 ~= 8 reported phases * 22
 + 11 / 22 for rounding
      Parameters:
      cal - the calendar.
      Returns:
      The phase of the moon as a number between 0 and 7 with 0 meaning new moon and 4 meaning full moon.
      Since:
      1.2, Ant 1.5

    • getDateForHeader

      public static String getDateForHeader()
      Returns the current Date in a format suitable for a SMTP date header.
      Returns:
      the current date.
      Since:
      Ant 1.5.2

    • parseDateFromHeader

      public static Date parseDateFromHeader(String datestr) throws ParseException
      Parses the string in a format suitable for a SMTP date header.
      Parameters:
      datestr - string to be parsed
      Returns:
      a java.util.Date object as parsed by the format.
      Throws:
      ParseException - if the supplied string cannot be parsed by this pattern.
      Since:
      Ant 1.8.0

    • parseIso8601DateTime

      public static Date parseIso8601DateTime(String datestr) throws ParseException
      Parse a string as a datetime using the ISO8601_DATETIME format which is yyyy-MM-dd'T'HH:mm:ss
      Parameters:
      datestr - string to be parsed
      Returns:
      a java.util.Date object as parsed by the format.
      Throws:
      ParseException - if the supplied string cannot be parsed by this pattern.
      Since:
      Ant 1.6

    • parseIso8601Date

      public static Date parseIso8601Date(String datestr) throws ParseException
      Parse a string as a date using the ISO8601_DATE format which is yyyy-MM-dd
      Parameters:
      datestr - string to be parsed
      Returns:
      a java.util.Date object as parsed by the format.
      Throws:
      ParseException - if the supplied string cannot be parsed by this pattern.
      Since:
      Ant 1.6

    • parseIso8601DateTimeOrDate

      public static Date parseIso8601DateTimeOrDate(String datestr) throws ParseException
      Parse a string as a date using the either the ISO8601_DATETIME or ISO8601_DATE formats.
      Parameters:
      datestr - string to be parsed
      Returns:
      a java.util.Date object as parsed by the formats.
      Throws:
      ParseException - if the supplied string cannot be parsed by either of these patterns.
      Since:
      Ant 1.6

    • parseLenientDateTime

      public static Date parseLenientDateTime(String dateStr) throws ParseException
      Parse a lenient ISO 8601, ms since epoch, or <touch>-style date. That is:
      • Milliseconds since 1970-01-01 00:00
      • YYYY-MM-DD{T| }HH:MM[:SS[.SSS]][ ][±ZZ[[:]ZZ]]
      • MM/DD/YYYY HH:MM[:SS] {AM|PM}
      where {a|b} indicates that you must choose one of a or b, and [c] indicates that you may use or omit c. ±ZZZZ is the timezone offset, and may be literally "Z" to mean GMT.
      Parameters:
      dateStr - String
      Returns:
      Date
      Throws:
      ParseException - if date string does not match ISO 8601
      Since:
      Ant 1.10.2