ucommon

DateTime Class Reference

The Datetime class uses a julian date representation of the current year, month, and day and a integer representation of the current time. More...

#include <datetime.h>

Inheritance diagram for DateTime:
Collaboration diagram for DateTime:

Public Types

enum  index_t {
  year = Date::year, month = Date::month, day = Date::day, dow = Date::dow,
  hour = Time::hour, minute = Time::minute, second = Time::second
}
 

Index to components we can access.


Public Member Functions

 DateTime (time_t time)
 Construct a date and time from C library time_t type.
 DateTime (tm_t *tm)
 Construct a date and time from C library time structure.
 DateTime (int year, unsigned month, unsigned day, int hour=0, int minute=0, int second=0)
 Construct a date and time object from explicit date and time values.
 DateTime (const DateTime &object)
 Create a datetime object from another object.
 DateTime (const char *pointer, size_t size=0)
 Construct a date and time from ISO string buffer.
 DateTime ()
 Construct a new date and time object with current date and time.
String format (const char *strftime) const
 Return date and time formatted using strftime format values.
char * get (char *buffer) const
 Get a ISO formatted date and time string for current object.
time_t get (void) const
 Get C library time_t type if object in C library epoch range.
bool isValid (void) const
 Test if object is valid.
 operator bool () const
 Test is date and time is valid for is() operator.
 operator double () const
 Convert date and time to julian day number.
 operator long () const
 Casting operator to return date as number.
bool operator! () const
 Check if date and time is not valid.
bool operator!= (const DateTime &datetime)
 Compare date and time with another date and time to see if not same.
DateTime operator+ (long seconds)
 Add seconds to datetime in an expression.
DateTimeoperator++ ()
 Add a day from the current date and time.
DateTimeoperator+= (long seconds)
 Add seconds to the current datetime object.
DateTime operator- (long seconds)
 Subtract seconds from datetime in an expression.
long operator- (const DateTime &datetime)
 Operator to compute number of days between two dates.
DateTimeoperator-- ()
 Subtract a day from the current date and time.
DateTimeoperator-= (long seconds)
 Subtract seconds from current datetime object.
bool operator< (const DateTime &datetime)
 Compare date and time with another date and time to see if earlier.
bool operator<= (const DateTime &datetime)
 Compare date and time with another date and time to see if earlier or the same.
DateTimeoperator= (const DateTime &datetime)
 Assign date and time from another datetime object.
bool operator== (const DateTime &datetime)
 Compare date and time with another date and time to see if the same.
bool operator> (const DateTime &datetime)
 Compare date and time with another date and time to see if later.
bool operator>= (const DateTime &datetime)
 Compare date and time with another date and time to see if later or the same.
int operator[] (index_t component) const
 Access time components.
void set (void)
 Set (update) the date and time with current date and time.
virtual ~DateTime ()
 Destroy date and time object.

Static Public Member Functions

static tm_tglt (time_t *time=NULL)
 Fetch an instance of time converted to local time.
static tm_tgmt (time_t *time=NULL)
 Fetch an instance of time converted to gmt.
static void release (tm_t *object)
 Release a struct tm object from glt or gmt.

Static Public Attributes

static const long c_day
 Constant for number of seconds in a day.
static const long c_hour
 Constant for number of seconds in a hour.
static const long c_week
 Constant for number of seconds in a week.
static const size_t sz_string
 Size of datetime string field.

Protected Member Functions

void update (void)
 A method to use to "post" any changed values when shadowing a mixed object class.

Detailed Description

The Datetime class uses a julian date representation of the current year, month, and day and a integer representation of the current time.

This is then manipulated in several forms and may be exported as needed.

Author:
Marcelo Dalmas <mad@brasmap.com.br> Integer based time class.
Examples:

datetime.cpp.

Definition at line 620 of file datetime.h.


Constructor & Destructor Documentation

DateTime::DateTime ( time_t  time)

Construct a date and time from C library time_t type.

Parameters:
timetype to make date and time from.
DateTime::DateTime ( tm_t tm)

Construct a date and time from C library time structure.

Parameters:
tmstructure from C library (from glt or gmt).
DateTime::DateTime ( const char *  pointer,
size_t  size = 0 
)

Construct a date and time from ISO string buffer.

Parameters:
pointerto string field holding date and time.
sizeof field if not null terminated string.
DateTime::DateTime ( int  year,
unsigned  month,
unsigned  day,
int  hour = 0,
int  minute = 0,
int  second = 0 
)

Construct a date and time object from explicit date and time values.

Parameters:
yearof object.
monthof object (1-12).
dayof month of object (1-31).
hourof object (0-23).
minuteof object (0-59).
secondof object (0-59).
DateTime::DateTime ( const DateTime object)

Create a datetime object from another object.

Parameters:
objectto copy.

Member Function Documentation

String DateTime::format ( const char *  strftime) const

Return date and time formatted using strftime format values.

Parameters:
strftimeformat to use.
Returns:
String object with formatted time.
char* DateTime::get ( char *  buffer) const

Get a ISO formatted date and time string for current object.

Parameters:
bufferto store date and time in (yyyy-mm-dd hh:mm:ss).
Returns:
string buffer if object is valid.

Reimplemented from Date.

time_t DateTime::get ( void  ) const

Get C library time_t type if object in C library epoch range.

Returns:
time in seconds from epoch or ~0l if out of range.

Reimplemented from Date.

static tm_t* DateTime::glt ( time_t *  time = NULL) [static]

Fetch an instance of time converted to local time.

If the localtime abi is not re-entrant, than a lock is held, otherwise a unique object is returned. In either case, when you are done, you must release the object.

Parameters:
timeobject or NULL if using current time.
Returns:
locked instance of struct tm object.
static tm_t* DateTime::gmt ( time_t *  time = NULL) [static]

Fetch an instance of time converted to gmt.

If the gmtime abi is not re-entrant, than a lock is held, otherwise a unique object is returned. In either case, when you are done, you must release the object.

Parameters:
timeobject or NULL if using current time.
Returns:
locked instance of struct tm object.
bool DateTime::isValid ( void  ) const

Test if object is valid.

Returns:
true if object is valid.

Reimplemented from Date.

DateTime::operator bool ( ) const

Test is date and time is valid for is() operator.

Returns:
true if object is valid.

Reimplemented from Date.

DateTime::operator double ( ) const

Convert date and time to julian day number.

Returns:
julian day number as a double.
DateTime::operator long ( ) const [inline]

Casting operator to return date as number.

Returns:
date as a number.

Reimplemented from Date.

Definition at line 844 of file datetime.h.

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bool DateTime::operator! ( ) const

Check if date and time is not valid.

Returns:
true if not valid.

Reimplemented from Date.

bool DateTime::operator!= ( const DateTime datetime)

Compare date and time with another date and time to see if not same.

Parameters:
datetimeto compare with.
Returns:
true if not equal.
DateTime DateTime::operator+ ( long  seconds)

Add seconds to datetime in an expression.

Day overflows update julian date.

Parameters:
secondsto add to datetime.
Returns:
new modified datetime object.

Reimplemented from Date.

DateTime& DateTime::operator++ ( )

Add a day from the current date and time.

Returns:
datetime object reference that was modified.

Reimplemented from Date.

DateTime& DateTime::operator+= ( long  seconds)

Add seconds to the current datetime object.

Day overflows update julian date.

Parameters:
secondsto add to object.
Returns:
modified datetime object.

Reimplemented from Date.

DateTime DateTime::operator- ( long  seconds)

Subtract seconds from datetime in an expression.

Day underflows update julian date.

Parameters:
secondsto subtract from datetime.
Returns:
new modified datetime object.

Reimplemented from Date.

long DateTime::operator- ( const DateTime datetime)

Operator to compute number of days between two dates.

Parameters:
datetimeto offset from for computation.
Returns:
number of days difference.
DateTime& DateTime::operator-- ( )

Subtract a day from the current date and time.

Returns:
datetime object reference that was modified.

Reimplemented from Date.

DateTime& DateTime::operator-= ( long  seconds)

Subtract seconds from current datetime object.

Day underflows update julian date.

Parameters:
secondsto subtract from object.
Returns:
modified datetime object.

Reimplemented from Date.

bool DateTime::operator< ( const DateTime datetime)

Compare date and time with another date and time to see if earlier.

Parameters:
datetimeto compare with.
Returns:
true if earlier.
bool DateTime::operator<= ( const DateTime datetime)

Compare date and time with another date and time to see if earlier or the same.

Parameters:
datetimeto compare with.
Returns:
true if earlier or equal.
DateTime& DateTime::operator= ( const DateTime datetime)

Assign date and time from another datetime object.

Parameters:
datetimeobject to assign from.
Returns:
assigned datetime object.
bool DateTime::operator== ( const DateTime datetime)

Compare date and time with another date and time to see if the same.

Parameters:
datetimeto compare with.
Returns:
true if equal.
bool DateTime::operator> ( const DateTime datetime)

Compare date and time with another date and time to see if later.

Parameters:
datetimeto compare with.
Returns:
true if later.
bool DateTime::operator>= ( const DateTime datetime)

Compare date and time with another date and time to see if later or the same.

Parameters:
datetimeto compare with.
Returns:
true if later or equal.
int DateTime::operator[] ( index_t  component) const

Access time components.

Parameters:
componentto access.
Returns:
number or -1 if invalid.

Reimplemented from Date.

static void DateTime::release ( tm_t object) [static]

Release a struct tm object from glt or gmt.

Parameters:
objectto release.
void DateTime::update ( void  ) [protected, virtual]

A method to use to "post" any changed values when shadowing a mixed object class.

This is used by DateNumber and string classes.

Reimplemented from Date.

Reimplemented in DateTimeString.


The documentation for this class was generated from the following file: