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

Class TimeUtils

java.lang.Object
kala.compress.utils.TimeUtils
public final class TimeUtils extends 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

  • Field Details

    • 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:

  • Constructor Details

    • TimeUtils

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

  • Method Details

    • isUnixTime

      public static boolean isUnixTime(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 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(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(FileTime fileTime)
      Converts FileTime to standard UNIX time.
      Parameters:
      fileTime - the original FileTime.
      Returns:
      the UNIX timestamp.

    • truncateToHundredNanos

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

    • unixTimeToFileTime

      public static 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 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