DateUtils (Apache Ant API)

java.lang.Object
- org.apache.tools.ant.util.DateUtils

```
public final class DateUtils
extends java.lang.Object
```
Helper methods to deal with date/time formatting with a specific defined format (ISO8601) or a plurialization correct elapsed time in minutes and seconds.

Since:

Ant 1.5

Field Summary

Fields
Modifier and Type	Field and Description
`static java.text.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
`static java.lang.ThreadLocal<java.text.DateFormat>`	`EN_US_DATE_FORMAT_MIN` Provides a thread-local US-style date format.
`static java.lang.ThreadLocal<java.text.DateFormat>`	`EN_US_DATE_FORMAT_SEC` Provides a thread-local US-style date format.
`static java.lang.String`	`ISO8601_DATE_PATTERN` ISO8601-like pattern for date.
`static java.lang.String`	`ISO8601_DATETIME_PATTERN` ISO8601-like pattern for date-time.
`static java.lang.String`	`ISO8601_TIME_PATTERN` ISO8601-like pattern for time.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static java.lang.String`	`format(java.util.Date date, java.lang.String pattern)` Format a date/time into a specific pattern.
`static java.lang.String`	`format(long date, java.lang.String pattern)` Format a date/time into a specific pattern.
`static java.lang.String`	`formatElapsedTime(long millis)` Format an elapsed time into a pluralization correct string.
`static java.lang.String`	`getDateForHeader()` Returns the current Date in a format suitable for a SMTP date header.
`static int`	`getPhaseOfMoon(java.util.Calendar cal)` Calculate the phase of the moon for a given date.
`static java.util.Date`	`parseDateFromHeader(java.lang.String datestr)` Parses the string in a format suitable for a SMTP date header.
`static java.util.Date`	`parseIso8601Date(java.lang.String datestr)` Parse a string as a date using the ISO8601_DATE format which is `yyyy-MM-dd`
`static java.util.Date`	`parseIso8601DateTime(java.lang.String datestr)` Parse a string as a datetime using the ISO8601_DATETIME format which is `yyyy-MM-dd'T'HH:mm:ss`
`static java.util.Date`	`parseIso8601DateTimeOrDate(java.lang.String datestr)` Parse a string as a date using the either the ISO8601_DATETIME or ISO8601_DATE formats.
`static java.util.Date`	`parseLenientDateTime(java.lang.String dateStr)` Parse a lenient ISO 8601, ms since epoch, or `<touch>`-style date.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ISO8601_DATETIME_PATTERN
```
public static final java.lang.String ISO8601_DATETIME_PATTERN
```
    ISO8601-like pattern for date-time. It does not support timezone. yyyy-MM-ddTHH:mm:ss
    
    See Also:
    
    Constant Field Values
  - ISO8601_DATE_PATTERN
```
public static final java.lang.String ISO8601_DATE_PATTERN
```
    ISO8601-like pattern for date. yyyy-MM-dd
    
    See Also:
    
    Constant Field Values
  - ISO8601_TIME_PATTERN
```
public static final java.lang.String ISO8601_TIME_PATTERN
```
    ISO8601-like pattern for time. HH:mm:ss
    
    See Also:
    
    Constant Field Values
  - DATE_HEADER_FORMAT
```
public static final java.text.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 java.lang.ThreadLocal<java.text.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 1.9.10
  - EN_US_DATE_FORMAT_SEC
```
public static final java.lang.ThreadLocal<java.text.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 1.9.10
- Method Detail
  - format
```
public static java.lang.String format(long date,
                                      java.lang.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 java.lang.String format(java.util.Date date,
                                      java.lang.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 java.lang.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(java.util.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 java.lang.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 java.util.Date parseDateFromHeader(java.lang.String datestr)
                                          throws java.text.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:
    
    java.text.ParseException - if the supplied string cannot be parsed by this pattern.
    
    Since:
    
    Ant 1.8.0
  - parseIso8601DateTime
```
public static java.util.Date parseIso8601DateTime(java.lang.String datestr)
                                           throws java.text.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:
    
    java.text.ParseException - if the supplied string cannot be parsed by this pattern.
    
    Since:
    
    Ant 1.6
  - parseIso8601Date
```
public static java.util.Date parseIso8601Date(java.lang.String datestr)
                                       throws java.text.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:
    
    java.text.ParseException - if the supplied string cannot be parsed by this pattern.
    
    Since:
    
    Ant 1.6
  - parseIso8601DateTimeOrDate
```
public static java.util.Date parseIso8601DateTimeOrDate(java.lang.String datestr)
                                                 throws java.text.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:
    
    java.text.ParseException - if the supplied string cannot be parsed by either of these patterns.
    
    Since:
    
    Ant 1.6
  - parseLenientDateTime
```
public static java.util.Date parseLenientDateTime(java.lang.String dateStr)
                                           throws java.text.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:
    
    java.text.ParseException - if date string does not match ISO 8601
    
    Since:
    
    Ant 1.9.10

Class DateUtils

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ISO8601_DATETIME_PATTERN

ISO8601_DATE_PATTERN

ISO8601_TIME_PATTERN

DATE_HEADER_FORMAT

EN_US_DATE_FORMAT_MIN

EN_US_DATE_FORMAT_SEC

Method Detail

format

format

formatElapsedTime

getPhaseOfMoon

getDateForHeader

parseDateFromHeader

parseIso8601DateTime

parseIso8601Date

parseIso8601DateTimeOrDate

parseLenientDateTime