com.mhuss.AstroLib
Class TimeOps

java.lang.Object
  com.mhuss.AstroLib.TimeOps

public class TimeOps
extends java.lang.Object

TimeOps contains miscellaneous time-related functions.
These are not in DateOps because they cause a circular dependancy between DateOps and AstroDate

Constructor Summary

TimeOps()

Method Summary

static int	dstOffset() Calculate the current Daylight Time offset.
static int	dstOffset(java.util.Calendar cal) Calculate the current Daylight Time offset ( 0 or -1 ).
static double	dstOffsetInDays() Calculate the current Daylight Time offset in fractional days.
static double	dstOffsetInDays(java.util.Calendar cal) Calculate the current Daylight Time offset in fractional days.
static java.lang.String	formatTime(double t) Format a time as a String using the format HH:MM.
static int	tzOffset() Determine the absolute time zone offset from UTC in hours (-12 to +12) using the local timezone.
static int	tzOffset(java.util.Calendar cal) Determine the absolute time zone offset from UTC in hours (-12 to +12) for the spec'd Calendar.
static double	tzOffsetInDays() Determine the absolute time zone offset from UTC in fractional days (-0.5 to +0.5).
static double	tzOffsetInDays(java.util.Calendar cal) Determine the absolute time zone offset from UTC in fractional days (-0.5 to +0.5).

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeOps

public TimeOps()

Method Detail

dstOffset

public static int dstOffset(java.util.Calendar cal)

Calculate the current Daylight Time offset ( 0 or -1 ).
Add the result of this function to the current time to adjust.

Parameters:

cal - A java.util.Calendar object which is used to get the DST_OFFSET from (e.g., java.util.GregorianCalendar)

Returns:

DST_OFFSET in hours if Daylight time is in effect, 0 otherwise.

dstOffset

public static int dstOffset()

Calculate the current Daylight Time offset.
Add the result of this function to the current time to adjust.
This function uses a GregorianCalendar object.

Returns:

DST_OFFSET in hours if Daylight time is in effect, 0 otherwise.

dstOffsetInDays

public static double dstOffsetInDays(java.util.Calendar cal)

Calculate the current Daylight Time offset in fractional days.
Add the result of this function to the current time to adjust.

Parameters:

cal - A java.util.Calendar object which is used to get the DST_OFFSET

Returns:

DST_OFFSET in days if Daylight time is in effect, 0 otherwise.

dstOffsetInDays

public static double dstOffsetInDays()

Calculate the current Daylight Time offset in fractional days.
Add the result of this function to the current time to adjust.
This function uses a GregorianCalendar object.

Returns:

DST_OFFSET in days if Daylight time is in effect, 0 otherwise.

tzOffset

public static int tzOffset(java.util.Calendar cal)

Determine the absolute time zone offset from UTC in hours (-12 to +12) for the spec'd Calendar.

Parameters:

cal - The Calendar to use

Returns:

The offset in hours

tzOffset

public static int tzOffset()

Determine the absolute time zone offset from UTC in hours (-12 to +12) using the local timezone.

Returns:

The offset in hours

tzOffsetInDays

public static double tzOffsetInDays(java.util.Calendar cal)

Determine the absolute time zone offset from UTC in fractional days (-0.5 to +0.5).

Parameters:

cal - The Calendar to use

Returns:

The offset in decimal day

tzOffsetInDays

public static double tzOffsetInDays()

Determine the absolute time zone offset from UTC in fractional days (-0.5 to +0.5).

Returns:

The offset in decimal day

formatTime

public static java.lang.String formatTime(double t)

Format a time as a String using the format HH:MM.
The returned string will be "--:--" if the time is INVALID.

Parameters:

t - The time to format in days

Returns:

The formatted String