Module kala.compress.base
Package kala.compress.utils

Class TimeUtils

  • public final class TimeUtils
extends java.lang.Object
    Utility class for handling time-related types and conversions.

    Understanding UNIX vs NTFS timestamps:

    • A UNIX timestamp is a primitive long starting at the UNIX Epoch on January 1st, 1970 at Coordinated Universal Time (UTC)
    • An NTFS timestamp is a file time is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since 12:00 A.M. January 1, 1601 Coordinated Universal Time (UTC).
    Since:
    1.23

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private TimeUtils()
      Private constructor to prevent instantiation of this utility class.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.nio.file.attribute.FileTime dosTimeToFileTime​(long dosTime)
      Converts DOS time to Java time (number of milliseconds since epoch).
      static boolean isUnixTime​(long seconds)
      Tests whether a given number of seconds (since Epoch) can be safely represented in the standard UNIX time.
      static boolean isUnixTime​(java.nio.file.attribute.FileTime time)
      Tests whether a FileTime can be safely represented in the standard UNIX time.
      static java.nio.file.attribute.FileTime ntfsTimeToFileTime​(long ntfsTime)
      Converts NTFS time (100-nanosecond units since 1 January 1601) to a FileTime.
      static long toNtfsTime​(long javaTime)
      Converts Java time (milliseconds since Epoch) to NTFS time.
      static long toNtfsTime​(java.nio.file.attribute.FileTime fileTime)
      Converts a FileTime to NTFS time (100-nanosecond units since 1 January 1601).
      static long toUnixTime​(java.nio.file.attribute.FileTime fileTime)
      Converts FileTime to standard UNIX time.
      static java.nio.file.attribute.FileTime truncateToHundredNanos​(java.nio.file.attribute.FileTime fileTime)
      Truncates a FileTime to 100-nanosecond precision.
      static java.nio.file.attribute.FileTime unixTimeToFileTime​(long time)
      Converts standard UNIX time (in seconds, UTC/GMT) to FileTime.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • HUNDRED_NANOS_PER_MILLISECOND

        static final long HUNDRED_NANOS_PER_MILLISECOND
        The amount of 100-nanosecond intervals in one millisecond.

      • HUNDRED_NANOS_PER_SECOND

        private static final long HUNDRED_NANOS_PER_SECOND
        The amount of 100-nanosecond intervals in one second.

      • WINDOWS_EPOCH_OFFSET

        static final long WINDOWS_EPOCH_OFFSET
        Windows File Times

        A file time is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since 12:00 A.M. January 1, 1601 Coordinated Universal Time (UTC). This is the offset of Windows time 0 to UNIX epoch in 100-nanosecond intervals.

        See Also:
        Constant Field Values

    • Constructor Detail

      • TimeUtils

        private TimeUtils()
        Private constructor to prevent instantiation of this utility class.

    • Method Detail

      • isUnixTime

        public static boolean isUnixTime​(java.nio.file.attribute.FileTime time)
        Tests whether a FileTime can be safely represented in the standard UNIX time.

        TODO ? If the FileTime is null, this method always returns true.

        Parameters:
        time - the FileTime to evaluate, can be null.
        Returns:
        true if the time exceeds the minimum or maximum UNIX time, false otherwise.

      • isUnixTime

        public static boolean isUnixTime​(long seconds)
        Tests whether a given number of seconds (since Epoch) can be safely represented in the standard UNIX time.
        Parameters:
        seconds - the number of seconds (since Epoch) to evaluate.
        Returns:
        true if the time can be represented in the standard UNIX time, false otherwise.

      • ntfsTimeToFileTime

        public static java.nio.file.attribute.FileTime ntfsTimeToFileTime​(long ntfsTime)
        Converts NTFS time (100-nanosecond units since 1 January 1601) to a FileTime.
        Parameters:
        ntfsTime - the NTFS time in 100-nanosecond units.
        Returns:
        the FileTime.

      • toNtfsTime

        public static long toNtfsTime​(java.nio.file.attribute.FileTime fileTime)
        Converts a FileTime to NTFS time (100-nanosecond units since 1 January 1601).
        Parameters:
        fileTime - the FileTime.
        Returns:
        the NTFS time in 100-nanosecond units.

      • toNtfsTime

        public static long toNtfsTime​(long javaTime)
        Converts Java time (milliseconds since Epoch) to NTFS time.
        Parameters:
        javaTime - the Java time.
        Returns:
        the NTFS time.

      • toUnixTime

        public static long toUnixTime​(java.nio.file.attribute.FileTime fileTime)
        Converts FileTime to standard UNIX time.
        Parameters:
        fileTime - the original FileTime.
        Returns:
        the UNIX timestamp.

      • truncateToHundredNanos

        public static java.nio.file.attribute.FileTime truncateToHundredNanos​(java.nio.file.attribute.FileTime fileTime)
        Truncates a FileTime to 100-nanosecond precision.
        Parameters:
        fileTime - the FileTime to be truncated.
        Returns:
        the truncated FileTime.

      • unixTimeToFileTime

        public static java.nio.file.attribute.FileTime unixTimeToFileTime​(long time)
        Converts standard UNIX time (in seconds, UTC/GMT) to FileTime.
        Parameters:
        time - UNIX timestamp (in seconds, UTC/GMT).
        Returns:
        the corresponding FileTime.

      • dosTimeToFileTime

        public static java.nio.file.attribute.FileTime dosTimeToFileTime​(long dosTime)
        Converts DOS time to Java time (number of milliseconds since epoch).
        Parameters:
        dosTime - time to convert
        Returns:
        converted time
        Since:
        1.27.1-0