ccgl::utils_time Namespace Reference

Time related functions. More...

Classes
struct	DateTime
	A type representing the combination of date and time. More...

Functions
double	TimeCounting ()
	Precisely and cross-platform time counting function.
bool	IsLeapYear (const int yr)
	Check the given year is a leap year or not. More...
string	ConvertToString (const time_t date, bool utc_time=true)
	Convert date time to string as the format of "YYYY-MM-DD". More...
string	ConvertToString2 (const time_t date, bool utc_time=true)
	Convert date time to string as the format of "YYYY-MM-DD HH". More...
string	ConvertToString3 (const time_t date, bool utc_time=true)
	Convert date time to string as the format of "YYYY_MM_DD_HHMMSS". More...
time_t	ConvertToTime (const string &str_date, string const &format, bool include_hour, bool utc_time=true)
	Convert string to date time, string format could be %4d%2d%2d or d-d-d. More...
time_t	ConvertYMDToTime (int &year, int &month, int &day, bool utc_time=true)
	Convert integer year, month, and day to date time. More...
int	GetDateInfoFromTimet (time_t t, int *year, int *month, int *day, bool utc_time=true)
	Get date information from time_t variable. More...
void	LocalTime (time_t date, struct tm *t)
	Get local time. More...
void	UTCTime (time_t date, struct tm *t)
	Get UTC:+00:00 time. More...
void	GetDateTime (time_t date, struct tm *t, bool utc_time=true)
	Get UTC:+00:00 time. More...
int	GetYear (time_t date, bool utc_time=true)
	Get the year. More...
int	GetMonth (time_t date, bool utc_time=true)
	Get the month. More...
int	GetDay (time_t date, bool utc_time=true)
	Get the day. More...
int	DayOfYear (time_t date, bool utc_time=true)
	Get the day of one year, [1, 366].
int	DayOfYear (int year, int month, int day)
	Get the day of one year, [1, 366].
int	JulianDay (time_t date, bool utc_time=true)
	Get the Julian day from time_t date.
int	JulianDay (int year, int month, int day)
	Get the Julian day of one day from year, month, and day. More...

Detailed Description

Time related functions.

Function Documentation

ConvertToString()

string ccgl::utils_time::ConvertToString	(	const time_t	date,
		bool	utc_time = true
	)

Convert date time to string as the format of "YYYY-MM-DD".

Parameters

[in]	date	time_t data type
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

Returns

Date time string

ConvertToString2()

string ccgl::utils_time::ConvertToString2	(	const time_t	date,
		bool	utc_time = true
	)

Convert date time to string as the format of "YYYY-MM-DD HH".

Parameters

[in]	date	time_t data type
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

Returns

Date time string

ConvertToString3()

string ccgl::utils_time::ConvertToString3	(	const time_t	date,
		bool	utc_time = true
	)

Convert date time to string as the format of "YYYY_MM_DD_HHMMSS".

Parameters

[in]	date	time_t data type
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

Returns

Date time string

ConvertToTime()

time_t ccgl::utils_time::ConvertToTime	(	const string &	str_date,
		string const &	format,
		bool	include_hour,
		bool	utc_time = true
	)

Convert string to date time, string format could be %4d%2d%2d or d-d-d.

Example:

• 1. str_date => 20000323, format=> %4d%2d%2d
• 2. str_date => 2000-03-23, format => d-d-d
• 3. str_date => 2000-03-23 18:01:30, => d-d-d d:d:d or %4d-%2d-%2d %2d:%2d:%2d

Parameters

[in]	str_date	string date
[in]	format	string format
[in]	include_hour	bool Include Hour?
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

Returns

Date time time_t

ConvertYMDToTime()

time_t ccgl::utils_time::ConvertYMDToTime	(	int &	year,
		int &	month,
		int &	day,
		bool	utc_time = true
	)

Convert integer year, month, and day to date time.

Parameters

[in]	year	year number from 1970
[in]	month	month range from 1 to 12
[in]	day	day range from 1 to 31
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

Returns

Date time time_t

GetDateInfoFromTimet()

int ccgl::utils_time::GetDateInfoFromTimet	(	time_t	t,
		int *	year,
		int *	month,
		int *	day,
		bool	utc_time = true
	)

Get date information from time_t variable.

Parameters

[in]	t	time_t date
[out]	year,month,day	int value
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

GetDateTime()

void ccgl::utils_time::GetDateTime	(	time_t	date,
		struct tm *	t,
		bool	utc_time = true
	)

Get UTC:+00:00 time.

Parameters

[in]	date	time_t date
[out]	t	tm struct date
[in]	utc_time	By default, the input date is under UTC+00:00 timezone.

GetDay()

int ccgl::utils_time::GetDay	(	time_t	date,
		bool	utc_time = true
	)

Get the day.

Returns

int day, [1, 31]

GetMonth()

int ccgl::utils_time::GetMonth	(	time_t	date,
		bool	utc_time = true
	)

Get the month.

Returns

int month, [1, 12]

GetYear()

int ccgl::utils_time::GetYear	(	time_t	date,
		bool	utc_time = true
	)

Get the year.

Returns

int year from 1970

IsLeapYear()

bool ccgl::utils_time::IsLeapYear

(

const int

yr

)

Check the given year is a leap year or not.

divisible by 4, not if divisible by 100, but true if divisible by 400

JulianDay()

int ccgl::utils_time::JulianDay	(	int	year,
		int	month,
		int	day
	)

Get the Julian day of one day from year, month, and day.

Algorithm adopted from boost::date_time::gregorian_calendar_base::day_number.

Returns

int Julian day

LocalTime()

void ccgl::utils_time::LocalTime	(	time_t	date,
		struct tm *	t
	)

Get local time.

Parameters

[in]	date	time_t date
[out]	t	tm struct date

UTCTime()

void ccgl::utils_time::UTCTime	(	time_t	date,
		struct tm *	t
	)

Get UTC:+00:00 time.

Parameters

[in]	date	time_t date
[out]	t	tm struct date