Package org.apache.poi.ss.usermodel

Class DateUtil

  • Direct Known Subclasses:
    HSSFDateUtil
    public class DateUtil
extends java.lang.Object
    Contains methods for dealing with Excel dates.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static double convertTime​(java.lang.String timeStr)
      Converts a string of format "HH:MM" or "HH:MM:SS" to its (Excel) numeric equivalent
      static double getExcelDate​(java.util.Calendar date, boolean use1904windowing)
      Given a Date in the form of a Calendar, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900.
      static double getExcelDate​(java.util.Date date)
      Given a Date, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900.
      static double getExcelDate​(java.util.Date date, boolean use1904windowing)
      Given a Date, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900.
      static java.util.Calendar getJavaCalendar​(double date)
      Get EXCEL date as Java Calendar (with default time zone).
      static java.util.Calendar getJavaCalendar​(double date, boolean use1904windowing)
      Get EXCEL date as Java Calendar (with default time zone).
      static java.util.Calendar getJavaCalendar​(double date, boolean use1904windowing, java.util.TimeZone timeZone)
      Get EXCEL date as Java Calendar with given time zone.
      static java.util.Calendar getJavaCalendar​(double date, boolean use1904windowing, java.util.TimeZone timeZone, boolean roundSeconds)
      Get EXCEL date as Java Calendar with given time zone.
      static java.util.Calendar getJavaCalendarUTC​(double date, boolean use1904windowing)
      Get EXCEL date as Java Calendar with UTC time zone.
      static java.util.Date getJavaDate​(double date)
      Given an Excel date with using 1900 date windowing, and converts it to a java.util.Date.
      static java.util.Date getJavaDate​(double date, boolean use1904windowing)
      Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date.
      static java.util.Date getJavaDate​(double date, boolean use1904windowing, java.util.TimeZone tz)
      Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date.
      static java.util.Date getJavaDate​(double date, boolean use1904windowing, java.util.TimeZone tz, boolean roundSeconds)
      Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date.
      static java.util.Date getJavaDate​(double date, java.util.TimeZone tz)
      Given an Excel date with using 1900 date windowing, and converts it to a java.util.Date.
      static boolean isADateFormat​(int formatIndex, java.lang.String formatString)
      Given a format ID and its format String, will check to see if the format represents a date format or not.
      static boolean isADateFormat​(ExcelNumberFormat numFmt)
      Given a format ID and its format String, will check to see if the format represents a date format or not.
      static boolean isCellDateFormatted​(Cell cell)
      Check if a cell contains a date Since dates are stored internally in Excel as double values we infer it is a date if it is formatted as such.
      static boolean isCellDateFormatted​(Cell cell, ConditionalFormattingEvaluator cfEvaluator)
      Check if a cell contains a date Since dates are stored internally in Excel as double values we infer it is a date if it is formatted as such.
      static boolean isCellInternalDateFormatted​(Cell cell)
      Check if a cell contains a date, checking only for internal excel date formats.
      static boolean isInternalDateFormat​(int format)
      Given a format ID this will check whether the format represents an internal excel date format or not.
      static boolean isValidExcelDate​(double value)
      Given a double, checks if it is a valid Excel date.
      static java.util.Date parseYYYYMMDDDate​(java.lang.String dateStr)
      Converts a string of format "YYYY/MM/DD" to its (Excel) numeric equivalent
      static void setCalendar​(java.util.Calendar calendar, int wholeDays, int millisecondsInDay, boolean use1904windowing, boolean roundSeconds)  

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • getExcelDate

        public static double getExcelDate​(java.util.Date date)
        Given a Date, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
        Parameters:
        date - the Date
        Returns:
        Excel representation of Date (-1 if error - test for error by checking for less than 0.1)

      • getExcelDate

        public static double getExcelDate​(java.util.Date date,
                                  boolean use1904windowing)
        Given a Date, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
        Parameters:
        date - the Date
        use1904windowing - Should 1900 or 1904 date windowing be used?
        Returns:
        Excel representation of Date (-1 if error - test for error by checking for less than 0.1)

      • getExcelDate

        public static double getExcelDate​(java.util.Calendar date,
                                  boolean use1904windowing)
        Given a Date in the form of a Calendar, converts it into a double representing its internal Excel representation, which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
        Parameters:
        date - the Calendar holding the date to convert
        use1904windowing - Should 1900 or 1904 date windowing be used?
        Returns:
        Excel representation of Date (-1 if error - test for error by checking for less than 0.1)

      • getJavaDate

        public static java.util.Date getJavaDate​(double date,
                                         java.util.TimeZone tz)
        Given an Excel date with using 1900 date windowing, and converts it to a java.util.Date. Excel Dates and Times are stored without any timezone information. If you know (through other means) that your file uses a different TimeZone to the system default, you can use this version of the getJavaDate() method to handle it.
        Parameters:
        date - The Excel date.
        tz - The TimeZone to evaluate the date in
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaDate

        public static java.util.Date getJavaDate​(double date)
        Given an Excel date with using 1900 date windowing, and converts it to a java.util.Date. NOTE: If the default TimeZone in Java uses Daylight Saving Time then the conversion back to an Excel date may not give the same value, that is the comparison excelDate == getExcelDate(getJavaDate(excelDate,false)) is not always true. For example if default timezone is Europe/Copenhagen, on 2004-03-28 the minute after 01:59 CET is 03:00 CEST, if the excel date represents a time between 02:00 and 03:00 then it is converted to past 03:00 summer time
        Parameters:
        date - The Excel date.
        Returns:
        Java representation of the date, or null if date is not a valid Excel date
        See Also:
        TimeZone

      • getJavaDate

        public static java.util.Date getJavaDate​(double date,
                                         boolean use1904windowing,
                                         java.util.TimeZone tz)
        Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date. Excel Dates and Times are stored without any timezone information. If you know (through other means) that your file uses a different TimeZone to the system default, you can use this version of the getJavaDate() method to handle it.
        Parameters:
        date - The Excel date.
        tz - The TimeZone to evaluate the date in
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaDate

        public static java.util.Date getJavaDate​(double date,
                                         boolean use1904windowing,
                                         java.util.TimeZone tz,
                                         boolean roundSeconds)
        Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date. Excel Dates and Times are stored without any timezone information. If you know (through other means) that your file uses a different TimeZone to the system default, you can use this version of the getJavaDate() method to handle it.
        Parameters:
        date - The Excel date.
        tz - The TimeZone to evaluate the date in
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        roundSeconds - round to closest second
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaDate

        public static java.util.Date getJavaDate​(double date,
                                         boolean use1904windowing)
        Given an Excel date with either 1900 or 1904 date windowing, converts it to a java.util.Date. NOTE: If the default TimeZone in Java uses Daylight Saving Time then the conversion back to an Excel date may not give the same value, that is the comparison excelDate == getExcelDate(getJavaDate(excelDate,false)) is not always true. For example if default timezone is Europe/Copenhagen, on 2004-03-28 the minute after 01:59 CET is 03:00 CEST, if the excel date represents a time between 02:00 and 03:00 then it is converted to past 03:00 summer time
        Parameters:
        date - The Excel date.
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        Returns:
        Java representation of the date, or null if date is not a valid Excel date
        See Also:
        TimeZone

      • setCalendar

        public static void setCalendar​(java.util.Calendar calendar,
                               int wholeDays,
                               int millisecondsInDay,
                               boolean use1904windowing,
                               boolean roundSeconds)

      • getJavaCalendar

        public static java.util.Calendar getJavaCalendar​(double date)
        Get EXCEL date as Java Calendar (with default time zone). This is like getJavaDate(double) but returns a Calendar object.
        Parameters:
        date - The Excel date.
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaCalendar

        public static java.util.Calendar getJavaCalendar​(double date,
                                                 boolean use1904windowing)
        Get EXCEL date as Java Calendar (with default time zone). This is like getJavaDate(double, boolean) but returns a Calendar object.
        Parameters:
        date - The Excel date.
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaCalendarUTC

        public static java.util.Calendar getJavaCalendarUTC​(double date,
                                                    boolean use1904windowing)
        Get EXCEL date as Java Calendar with UTC time zone. This is similar to getJavaDate(double, boolean) but returns a Calendar object that has UTC as time zone, so no daylight saving hassle.
        Parameters:
        date - The Excel date.
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        Returns:
        Java representation of the date in UTC, or null if date is not a valid Excel date

      • getJavaCalendar

        public static java.util.Calendar getJavaCalendar​(double date,
                                                 boolean use1904windowing,
                                                 java.util.TimeZone timeZone)
        Get EXCEL date as Java Calendar with given time zone.
        Parameters:
        date - The Excel date.
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        timeZone - The TimeZone to evaluate the date in
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • getJavaCalendar

        public static java.util.Calendar getJavaCalendar​(double date,
                                                 boolean use1904windowing,
                                                 java.util.TimeZone timeZone,
                                                 boolean roundSeconds)
        Get EXCEL date as Java Calendar with given time zone.
        Parameters:
        date - The Excel date.
        use1904windowing - true if date uses 1904 windowing, or false if using 1900 date windowing.
        timeZone - The TimeZone to evaluate the date in
        roundSeconds - round to closest second
        Returns:
        Java representation of the date, or null if date is not a valid Excel date

      • isADateFormat

        public static boolean isADateFormat​(ExcelNumberFormat numFmt)
        Given a format ID and its format String, will check to see if the format represents a date format or not. Firstly, it will check to see if the format ID corresponds to an internal excel date format (eg most US date formats) If not, it will check to see if the format string only contains date formatting characters (ymd-/), which covers most non US date formats.
        Parameters:
        numFmt - The number format index and string expression, or null if not specified
        Returns:
        true if it is a valid date format, false if not or null
        See Also:
        isInternalDateFormat(int)

      • isADateFormat

        public static boolean isADateFormat​(int formatIndex,
                                    java.lang.String formatString)
        Given a format ID and its format String, will check to see if the format represents a date format or not. Firstly, it will check to see if the format ID corresponds to an internal excel date format (eg most US date formats) If not, it will check to see if the format string only contains date formatting characters (ymd-/), which covers most non US date formats.
        Parameters:
        formatIndex - The index of the format, eg from ExtendedFormatRecord.getFormatIndex
        formatString - The format string, eg from FormatRecord.getFormatString
        Returns:
        true if it is a valid date format, false if not or null
        See Also:
        isInternalDateFormat(int)

      • isInternalDateFormat

        public static boolean isInternalDateFormat​(int format)
        Given a format ID this will check whether the format represents an internal excel date format or not.
        See Also:
        isADateFormat(int, java.lang.String)

      • isCellDateFormatted

        public static boolean isCellDateFormatted​(Cell cell)
        Check if a cell contains a date Since dates are stored internally in Excel as double values we infer it is a date if it is formatted as such.
        Parameters:
        cell -
        Returns:
        true if it looks like a date
        See Also:
        isADateFormat(int, String), isInternalDateFormat(int)

      • isCellDateFormatted

        public static boolean isCellDateFormatted​(Cell cell,
                                          ConditionalFormattingEvaluator cfEvaluator)
        Check if a cell contains a date Since dates are stored internally in Excel as double values we infer it is a date if it is formatted as such. Format is determined from applicable conditional formatting, if any, or cell style.
        Parameters:
        cell -
        cfEvaluator - if available, or null
        Returns:
        true if it looks like a date
        See Also:
        isADateFormat(int, String), isInternalDateFormat(int)

      • isCellInternalDateFormatted

        public static boolean isCellInternalDateFormatted​(Cell cell)
        Check if a cell contains a date, checking only for internal excel date formats. As Excel stores a great many of its dates in "non-internal" date formats, you will not normally want to use this method.
        See Also:
        isADateFormat(int,String), isInternalDateFormat(int)

      • isValidExcelDate

        public static boolean isValidExcelDate​(double value)
        Given a double, checks if it is a valid Excel date.
        Parameters:
        value - the double value
        Returns:
        true if valid

      • convertTime

        public static double convertTime​(java.lang.String timeStr)
        Converts a string of format "HH:MM" or "HH:MM:SS" to its (Excel) numeric equivalent
        Returns:
        a double between 0 and 1 representing the fraction of the day

      • parseYYYYMMDDDate

        public static java.util.Date parseYYYYMMDDDate​(java.lang.String dateStr)
        Converts a string of format "YYYY/MM/DD" to its (Excel) numeric equivalent
        Returns:
        a double representing the (integer) number of days since the start of the Excel epoch