A value of type Date. Note that a Date may include a TimeZone.
DateValue
public DateValue(CharSequence s)
throws ValidationException
Constructor: create a date value from a supplied string, in
ISO 8601 format
s
- the lexical form of the date value
DateValue
public DateValue(GregorianCalendar calendar,
int tz)
Create a DateValue
calendar
- the absolute date/time valuetz
- The timezone offset from GMT in minutes, positive or negative; or the special
value NO_TIMEZONE indicating that the value is not in a timezone
DateValue
public DateValue(int year,
byte month,
byte day)
Constructor given a year, month, and day. Performs no validation.
year
- The year as held internally (note that the year before 1AD is 0)month
- The month, 1-12day
- The day 1-31
DateValue
public DateValue(int year,
byte month,
byte day,
int tz)
Constructor given a year, month, and day, and timezone. Performs no validation.
year
- The year as held internally (note that the year before 1AD is 0)month
- The month, 1-12day
- The day 1-31tz
- the timezone displacement in minutes from UTC. Supply the value
CalendarValue.NO_TIMEZONE
if there is no timezone component.
DateValue
public DateValue(int year,
byte month,
byte day,
int tz,
AtomicType type)
Constructor given a year, month, and day, and timezone, and an AtomicType representing
a subtype of xs:date. Performs no validation.
year
- The year as held internally (note that the year before 1AD is 0)month
- The month, 1-12day
- The day 1-31tz
- the timezone displacement in minutes from UTC. Supply the value
CalendarValue.NO_TIMEZONE
if there is no timezone component.type
- the type. This must be a type derived from xs:date, and the value
must conform to this type. The method does not check these conditions.
adjustTimezone
public CalendarValue adjustTimezone(int timezone)
Return a new date with the same normalized value, but
in a different timezone. This is called only for a DateValue that has an explicit timezone
- adjustTimezone in interface CalendarValue
timezone
- the new timezone offset, in minutes
- the time in the new timezone. This will be a new TimeValue unless no change
was required to the original value
compareTo
public int compareTo(Object v2)
Context-free comparison of two DateValue values. For this to work,
the two values must either both have a timezone or both have none.
- the result of the comparison: -1 if the first is earlier, 0 if they
are equal, +1 if the first is later
dateFromJulianDayNumber
public static DateValue dateFromJulianDayNumber(int julianDayNumber)
Get the Gregorian date corresponding to a particular Julian day number. The algorithm
is taken from http://www.hermetic.ch/cal_stud/jdn.htm#comp
julianDayNumber
- the Julian day number
- a DateValue with no timezone information set
getCanonicalLexicalRepresentation
public CharSequence getCanonicalLexicalRepresentation()
Get the canonical lexical representation as defined in XML Schema. This is not always the same
as the result of casting to a string according to the XPath rules. For xs:date, the timezone is
adjusted to be in the range +12:00 to -11:59
- getCanonicalLexicalRepresentation in interface Value
- the canonical lexical representation if defined in XML Schema; otherwise, the result
of casting to string according to the XPath 2.0 rules
getDayOfWeek
public static int getDayOfWeek(int year,
int month,
int day)
Get the day of the week. The days of the week are numbered from
1 (Monday) to 7 (Sunday)
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
- the day of the week, 1=Monday .... 7=Sunday
getDayWithinYear
public static int getDayWithinYear(int year,
int month,
int day)
Get the ordinal day number within the year (1 Jan = 1, 1 Feb = 32, etc)
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
- the ordinal day number within the year
getJulianDayNumber
public static int getJulianDayNumber(int year,
int month,
int day)
Calculate the Julian day number at 00:00 on a given date. This algorithm is taken from
http://vsg.cape.com/~pbaum/date/jdalg.htm and
http://vsg.cape.com/~pbaum/date/jdalg2.htm
(adjusted to handle BC dates correctly)
Note that this assumes dates in the proleptic Gregorian calendar
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
getPrimitiveType
public BuiltInAtomicType getPrimitiveType()
Determine the primitive type of the value. This delivers the same answer as
getItemType().getPrimitiveItemType(). The primitive types are
the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration,
and xs:untypedAtomic. For external objects, the result is AnyAtomicType.
- getPrimitiveType in interface AtomicValue
getWeekNumber
public static int getWeekNumber(int year,
int month,
int day)
Get the ISO week number for a given date. The days of the week are numbered from
1 (Monday) to 7 (Sunday), and week 1 in any calendar year is the week (from Monday to Sunday)
that includes the first Thursday of that year
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
getWeekNumberWithinMonth
public static int getWeekNumberWithinMonth(int year,
int month,
int day)
Get the week number within a month. This is required for the XSLT format-date() function,
and the rules are not entirely clear. The days of the week are numbered from
1 (Monday) to 7 (Sunday), and by analogy with the ISO week number, we consider that week 1
in any calendar month is the week (from Monday to Sunday) that includes the first Thursday
of that month. Unlike the ISO week number, we put the previous days in week zero.
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
- the week number within a month
makeDateValue
public static ConversionResult makeDateValue(CharSequence in)
Static factory method: construct a DateValue from a string in the lexical form
of a date, returning a ValidationFailure if the supplied string is invalid
in
- the lexical form of the date
- either a DateValue or a ValidationFailure
tomorrow
public static DateValue tomorrow(int year,
byte month,
byte day)
Get the date that immediately follows a given date
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
- a new DateValue with no timezone information
yesterday
public static DateValue yesterday(int year,
byte month,
byte day)
Get the date that immediately precedes a given date
year
- the yearmonth
- the month (1-12)day
- the day (1-31)
- a new DateValue with no timezone information