![]() |
ROOT 6.10/09 Reference Guide |
The TTimeStamp encapsulates seconds and ns since EPOCH.
This extends (and isolates) struct timespec
No accounting of leap seconds is made.
Due to ROOT/CINT limitations TTimeStamp does not explicitly hold a timespec struct; attempting to do so means the Streamer must be hand written. Instead we have chosen to simply contain similar fields within the private area of this class.
NOTE: the use of time_t (and its default implementation as a 32 int) implies overflow conditions occurs somewhere around Jan 18, 19:14:07, 2038
. If this experiment is still going when it becomes significant someone will have to deal with it.
Definition at line 71 of file TTimeStamp.h.
Public Member Functions | |
TTimeStamp () | |
Default ctor. More... | |
TTimeStamp (const timespec_t &ts) | |
TTimeStamp (time_t t, Int_t nsec) | |
TTimeStamp (UInt_t year, UInt_t month, UInt_t day, UInt_t hour, UInt_t min, UInt_t sec, UInt_t nsec=0, Bool_t isUTC=kTRUE, Int_t secOffset=0) | |
Create a TTimeStamp and set it to the specified year, month, day, time, hour, minute, second and nanosec. More... | |
TTimeStamp (UInt_t date, UInt_t time, UInt_t nsec, Bool_t isUTC=kTRUE, Int_t secOffset=0) | |
Create a TTimeStamp and set it to the specified date, time, nanosec. More... | |
TTimeStamp (UInt_t tloc, Bool_t isUTC=kTRUE, Int_t secOffset=0, Bool_t dosDate=kFALSE) | |
Create a TTimeStamp and set it to tloc which must be a time_t value returned by time(). More... | |
virtual | ~TTimeStamp () |
void | Add (const TTimeStamp &offset) |
Add "offset" as a delta time. More... | |
Double_t | AsDouble () const |
Double_t | AsGAST (Double_t UT1Offset=0) const |
Return Greenwich apparent sidereal time (GAST) in hour-angle. More... | |
Double_t | AsGMST (Double_t UT1Offset=0) const |
Return Greenwich mean sidereal time (GMST) in hour-angle. More... | |
Double_t | AsJulianDate () const |
Double_t | AsLAST (Double_t Longitude, Double_t UT1Offset=0) const |
Return local apparent sidereal time (LAST) in hour-angle, given a longitude in degrees. More... | |
Double_t | AsLMST (Double_t Longitude, Double_t UT1Offset=0) const |
Return local mean sidereal time (LMST) in hour-angle, given a longitude in degrees. More... | |
const char * | AsString (const Option_t *option="") const |
Return the date & time as a string. More... | |
void | Copy (TTimeStamp &ts) const |
Copy this to ts. More... | |
UInt_t | GetDate (Bool_t inUTC=kTRUE, Int_t secOffset=0, UInt_t *year=0, UInt_t *month=0, UInt_t *day=0) const |
Return date in form of 19971224 (i.e. More... | |
Int_t | GetDayOfWeek (Bool_t inUTC=kTRUE, Int_t secOffset=0) const |
Method is using Zeller's formula for calculating the day number. More... | |
Int_t | GetDayOfYear (Bool_t inUTC=kTRUE, Int_t secOffset=0) const |
Get the day of the year represented by this time stamp value. More... | |
Int_t | GetMonth (Bool_t inUTC=kTRUE, Int_t secOffset=0) const |
Get the month of the year. Valid return values are between 1 and 12. More... | |
Int_t | GetNanoSec () const |
time_t | GetSec () const |
UInt_t | GetTime (Bool_t inUTC=kTRUE, Int_t secOffset=0, UInt_t *hour=0, UInt_t *min=0, UInt_t *sec=0) const |
Return time in form of 123623 (i.e. More... | |
timespec_t | GetTimeSpec () const |
Int_t | GetWeek (Bool_t inUTC=kTRUE, Int_t secOffset=0) const |
Get the week of the year. More... | |
Bool_t | IsLeapYear (Bool_t inUTC=kTRUE, Int_t secOffset=0) const |
Is the year a leap year. More... | |
operator double () const | |
void | Print (const Option_t *option="") const |
Print date and time. More... | |
void | Set () |
Set Date/Time to current time as reported by the system. More... | |
void | Set (Int_t year, Int_t month, Int_t day, Int_t hour, Int_t min, Int_t sec, Int_t nsec, Bool_t isUTC, Int_t secOffset) |
Set Date/Time from components. More... | |
void | Set (Int_t date, Int_t time, Int_t nsec, Bool_t isUTC, Int_t secOffset) |
Set date/time from integers of the form [yy]YYMMDD and HHMMSS, assume UTC (UTC) components: More... | |
void | Set (UInt_t tloc, Bool_t isUTC, Int_t secOffset, Bool_t dosDate) |
The input arg is a time_t value returned by time() or a value returned by Convert(). More... | |
void | SetNanoSec (Int_t nsec) |
void | SetSec (Int_t sec) |
Static Public Member Functions | |
static void | DumpTMStruct (const tm_t &tmstruct) |
Print out the "tm" structure: tmstruct.tm_year = year; // years since 1900 tmstruct.tm_mon = month-1; // months since Jan [0,11] tmstruct.tm_mday = day; // day of the month [1,31] tmstruct.tm_hour = hour; // hours since midnight [0,23] tmstruct.tm_min = min; // minutes after the hour [0,59] tmstruct.tm_sec = sec; // seconds after the minute [0,59] tmstruct.tm_wday // day of week [0,6] tmstruct.tm_yday // days in year [0,365] tmstruct.tm_isdst // DST [-1/0/1] (unknown,false,true) . More... | |
static Int_t | GetDayOfWeek (Int_t day, Int_t month, Int_t year) |
Method is using Zeller's formula for calculating the day number. More... | |
static Int_t | GetDayOfYear (Int_t day, Int_t month, Int_t year) |
Get the day of the year represented by day, month and year. More... | |
static Int_t | GetWeek (Int_t day, Int_t month, Int_t year) |
Get the week of the year. More... | |
static Int_t | GetZoneOffset () |
Static method returning local (current) time zone offset from UTC. More... | |
static Bool_t | IsLeapYear (Int_t year) |
Is the given year a leap year. More... | |
static time_t | MktimeFromUTC (tm_t *tmstruct) |
Equivalent of standard routine "mktime" but using the assumption that tm struct is filled with UTC, not local, time. More... | |
Private Member Functions | |
void | NormalizeNanoSec () |
Ensure that the fNanoSec field is in range [0,999999999]. More... | |
Private Attributes | |
Int_t | fNanoSec |
Int_t | fSec |
Friends | |
Bool_t | operator!= (const TTimeStamp &lhs, const TTimeStamp &rhs) |
Bool_t | operator< (const TTimeStamp &lhs, const TTimeStamp &rhs) |
Bool_t | operator<= (const TTimeStamp &lhs, const TTimeStamp &rhs) |
Bool_t | operator== (const TTimeStamp &lhs, const TTimeStamp &rhs) |
Bool_t | operator> (const TTimeStamp &lhs, const TTimeStamp &rhs) |
Bool_t | operator>= (const TTimeStamp &lhs, const TTimeStamp &rhs) |
#include <TTimeStamp.h>
TTimeStamp::TTimeStamp | ( | ) |
Default ctor.
Create a TTimeStamp and set it to the current time (as best possible). The nanosecond part is faked so that subsequent calls simply add 1 to ensure that sequential calls are distinct (and sortable).
Definition at line 95 of file TTimeStamp.cxx.
|
inline |
Definition at line 91 of file TTimeStamp.h.
|
inline |
Definition at line 95 of file TTimeStamp.h.
TTimeStamp::TTimeStamp | ( | UInt_t | year, |
UInt_t | month, | ||
UInt_t | day, | ||
UInt_t | hour, | ||
UInt_t | min, | ||
UInt_t | sec, | ||
UInt_t | nsec = 0 , |
||
Bool_t | isUTC = kTRUE , |
||
Int_t | secOffset = 0 |
||
) |
Create a TTimeStamp and set it to the specified year, month, day, time, hour, minute, second and nanosec.
If !isUTC then it is assumed to be the standard local time zone.
If local time is PST then one can use
or
Definition at line 115 of file TTimeStamp.cxx.
TTimeStamp::TTimeStamp | ( | UInt_t | date, |
UInt_t | time, | ||
UInt_t | nsec, | ||
Bool_t | isUTC = kTRUE , |
||
Int_t | secOffset = 0 |
||
) |
Create a TTimeStamp and set it to the specified date, time, nanosec.
If !isUTC then it is assumed to be the standard local time zone.
TTimeStamp(UInt_t tloc, Bool_t isUTC, Int_t secOffset, Bool_t dosDate)
instead of this one. Your best bet is to explicitly pass UInt_t values instead of Int_t values. When calling with integer literals, pass for instance Definition at line 137 of file TTimeStamp.cxx.
TTimeStamp::TTimeStamp | ( | UInt_t | tloc, |
Bool_t | isUTC = kTRUE , |
||
Int_t | secOffset = 0 , |
||
Bool_t | dosDate = kFALSE |
||
) |
Create a TTimeStamp and set it to tloc which must be a time_t value returned by time().
This value is the number of seconds since the EPOCH (i.e. 00:00:00 on Jan 1m 1970). If dosDate is true then the input is a dosDate value.
Definition at line 150 of file TTimeStamp.cxx.
|
inlinevirtual |
Definition at line 112 of file TTimeStamp.h.
void TTimeStamp::Add | ( | const TTimeStamp & | offset | ) |
Add "offset" as a delta time.
Definition at line 534 of file TTimeStamp.cxx.
|
inline |
Definition at line 138 of file TTimeStamp.h.
Return Greenwich apparent sidereal time (GAST) in hour-angle.
Return value will always be between 0 and 24 (hours). Sidereal time is most accurately calculated from UT1. If fSec and fNanoSec are in UTC (which they are by default), the optional argument UT1Offset can be supplied (in milliseconds). If UT1Offset is not supplied, conversion has maximum error of 1s. If offset is supplied error can be reduced to us level. Values for UT1Offset can be found in IERS Bulletin B: ftp://ftp.iers.org/products/eop/bulletinb/format_2009/ Equation of the equinoxes is given by USNO: http://aa.usno.navy.mil/faq/docs/GAST.php
Definition at line 191 of file TTimeStamp.cxx.
Return Greenwich mean sidereal time (GMST) in hour-angle.
Return value will always be between 0 and 24 (hours). Sidereal time is most accurately calculated from UT1. If fSec and fNanoSec are in UTC (which they are by default), the optional argument UT1Offset can be supplied (in milliseconds). If UT1Offset is not supplied, conversion has maximum error of 1s. If offset is supplied error can be reduced to us level. Values for UT1Offset can be found in IERS Bulletin B: ftp://ftp.iers.org/products/eop/bulletinb/format_2009/ The conversion to sidereal time used here is given by Aoki et. al. Astron. Astrophys. 105, 359-362 (1982) http://adsabs.harvard.edu/abs/1982A%26A...105..359A
Definition at line 168 of file TTimeStamp.cxx.
|
inline |
Definition at line 139 of file TTimeStamp.h.
Return local apparent sidereal time (LAST) in hour-angle, given a longitude in degrees.
Return value will always be between 0 and 24 (hours). Sidereal time is most accurately calculated from UT1. If fSec and fNanoSec are in UTC (which they are by default), the optional argument UT1Offset can be supplied (in milliseconds). If UT1Offset is not supplied, conversion has maximum error of 1s. If offset is supplied error can be reduced to us level. Values for UT1Offset can be found in IERS Bulletin B: ftp://ftp.iers.org/products/eop/bulletinb/format_2009/
Definition at line 230 of file TTimeStamp.cxx.
Return local mean sidereal time (LMST) in hour-angle, given a longitude in degrees.
Return value will always be between 0 and 24 (hours). Sidereal time is most accurately calculated from UT1. If fSec and fNanoSec are in UTC (which they are by default), the optional argument UT1Offset can be supplied (in milliseconds). If UT1Offset is not supplied, conversion has maximum error of 1s. If offset is supplied error can be reduced to us level. Values for UT1Offset can be found in IERS Bulletin B: ftp://ftp.iers.org/products/eop/bulletinb/format_2009/
Definition at line 214 of file TTimeStamp.cxx.
Return the date & time as a string.
Result is pointer to a statically allocated string. User should copy this into their own buffer before calling this method again.
Option "l" returns it in local zone format (can be applied to default or compact format).
Default format is RFC822 compliant:
Option "c" compact is (almost) ISO 8601 compliant:
"2001-01-02 10:11:12.9999999999-0800" if PST
The "-HHMM" is replaced with "Z" if given as UTC. To be strictly conforming it should use "T" instead of the blank separating the date and time.
Option "2" returns as {sec,nsec} integers.
Option "s" returns "2001-01-02 18:11:12" with an implied UTC, overrides "l" option.
Internally uses a circular list of buffers to avoid problems using AsString multiple times in a single statement.
Definition at line 271 of file TTimeStamp.cxx.
void TTimeStamp::Copy | ( | TTimeStamp & | ts | ) | const |
Copy this to ts.
Definition at line 343 of file TTimeStamp.cxx.
Print out the "tm" structure:
.
Definition at line 903 of file TTimeStamp.cxx.
UInt_t TTimeStamp::GetDate | ( | Bool_t | inUTC = kTRUE , |
Int_t | secOffset = 0 , |
||
UInt_t * | year = 0 , |
||
UInt_t * | month = 0 , |
||
UInt_t * | day = 0 |
||
) | const |
Return date in form of 19971224 (i.e.
24/12/1997), if non-zero pointers supplied for year, month, day fill those as well.
Definition at line 353 of file TTimeStamp.cxx.
Method is using Zeller's formula for calculating the day number.
Valid return values range between 1 and 7, where Monday = 1.
Definition at line 418 of file TTimeStamp.cxx.
Method is using Zeller's formula for calculating the day number.
Valid return values range between 1 and 7, where Monday = 1.
Definition at line 829 of file TTimeStamp.cxx.
Get the day of the year represented by this time stamp value.
Valid return values range between 1 and 366, where January 1 = 1.
Definition at line 397 of file TTimeStamp.cxx.
Get the day of the year represented by day, month and year.
Valid return values range between 1 and 366, where January 1 = 1.
Definition at line 812 of file TTimeStamp.cxx.
Get the month of the year. Valid return values are between 1 and 12.
Definition at line 438 of file TTimeStamp.cxx.
|
inline |
Definition at line 136 of file TTimeStamp.h.
|
inline |
Definition at line 135 of file TTimeStamp.h.
UInt_t TTimeStamp::GetTime | ( | Bool_t | inUTC = kTRUE , |
Int_t | secOffset = 0 , |
||
UInt_t * | hour = 0 , |
||
UInt_t * | min = 0 , |
||
UInt_t * | sec = 0 |
||
) | const |
Return time in form of 123623 (i.e.
12:36:23), if non-zero pointers supplied for hour, min, sec fill those as well.
Definition at line 375 of file TTimeStamp.cxx.
|
inline |
Definition at line 133 of file TTimeStamp.h.
Get the week of the year.
Valid week values are between 1 and 53. The return value is the year*100+week (1 Jan may be in the last week of the previous year so the year must be returned too).
Definition at line 456 of file TTimeStamp.cxx.
Get the week of the year.
Valid week values are between 1 and 53. The return value is the year*100+week (1 Jan may be in the last week of the previous year so the year must be returned too).
Definition at line 850 of file TTimeStamp.cxx.
|
static |
Static method returning local (current) time zone offset from UTC.
This is the value in seconds one must add to the local time to arrive at Coordinated Universal Time, so it is negative east of the Prime Meridian.
Definition at line 504 of file TTimeStamp.cxx.
Is the year a leap year.
The calendar year is 365 days long, unless the year is exactly divisible by 4, in which case an extra day is added to February to make the year 366 days long. If the year is the last year of a century, eg. 1700, 1800, 1900, 2000, then it is only a leap year if it is exactly divisible by
Definition at line 484 of file TTimeStamp.cxx.
Is the given year a leap year.
The calendar year is 365 days long, unless the year is exactly divisible by 4, in which case an extra day is added to February to make the year 366 days long. If the year is the last year of a century, eg. 1700, 1800, 1900, 2000, then it is only a leap year if it is exactly divisible by
Definition at line 884 of file TTimeStamp.cxx.
|
static |
Equivalent of standard routine "mktime" but using the assumption that tm struct is filled with UTC, not local, time.
This version ISN'T configured to handle every possible weirdness of out-of-range values in the case of normalizing the tm struct.
This version DOESN'T correctly handle values that can't be fit into a time_t (i.e. beyond year 2038-01-18 19:14:07, or before the start of Epoch).
Definition at line 767 of file TTimeStamp.cxx.
|
private |
Ensure that the fNanoSec field is in range [0,999999999].
Definition at line 739 of file TTimeStamp.cxx.
|
inline |
Definition at line 166 of file TTimeStamp.h.
Print date and time.
Definition at line 544 of file TTimeStamp.cxx.
void TTimeStamp::Set | ( | ) |
Set Date/Time to current time as reported by the system.
No accounting for nanoseconds with std ANSI functions, ns part faked so that subsequent calls simply add 1 to it this ensures that calls within the same second come back distinct (and sortable). Time is since Jan 1, 1970.
Definition at line 556 of file TTimeStamp.cxx.
void TTimeStamp::Set | ( | Int_t | year, |
Int_t | month, | ||
Int_t | day, | ||
Int_t | hour, | ||
Int_t | min, | ||
Int_t | sec, | ||
Int_t | nsec, | ||
Bool_t | isUTC, | ||
Int_t | secOffset | ||
) |
Set Date/Time from components.
Month & day both use normal 1..12 and 1..31 counting, hours, min, sec run from 0 to 23, 59, 59 respectively, secOffset provides method for adjusting for alternative timezones
Definition at line 607 of file TTimeStamp.cxx.
Set date/time from integers of the form [yy]YYMMDD and HHMMSS, assume UTC (UTC) components:
Definition at line 660 of file TTimeStamp.cxx.
The input arg is a time_t value returned by time() or a value returned by Convert().
This value is the number of seconds since the EPOCH (i.e. 00:00:00 on Jan 1m 1970). If dosDate is true then the input is a dosDate value.
Definition at line 690 of file TTimeStamp.cxx.
Definition at line 131 of file TTimeStamp.h.
Definition at line 130 of file TTimeStamp.h.
|
friend |
Definition at line 185 of file TTimeStamp.h.
|
friend |
Definition at line 189 of file TTimeStamp.h.
|
friend |
Definition at line 194 of file TTimeStamp.h.
|
friend |
Definition at line 181 of file TTimeStamp.h.
|
friend |
Definition at line 199 of file TTimeStamp.h.
|
friend |
Definition at line 204 of file TTimeStamp.h.
|
private |
Definition at line 82 of file TTimeStamp.h.
|
private |
Definition at line 81 of file TTimeStamp.h.