src/corelib/tools/qdatetime.cpp File Reference

#include "qplatformdefs.h"
#include "private/qdatetime_p.h"
#include "qdatastream.h"
#include "qset.h"
#include "qlocale.h"
#include "qdatetime.h"
#include "qregexp.h"
#include "qdebug.h"
#include <locale.h>
#include <time.h>

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Defines
#define	QDTPDEBUG   if (false) qDebug()
#define	QDTPDEBUGN   if (false) qDebug
Enumerations
enum
Functions
static QDate	strictDate (int y, int m, int d)
static QDate	fixedDate (int y, int m, int d)
static uint	julianDayFromDate (int year, int month, int day)
static void	getDateFromJulianDay (uint julianDay, int *year, int *month, int *day)
static QString	fmtDateTime (const QString &f, const QTime *dt=0, const QDate *dd=0)
static uint	toTime_t (const QDate &utcDate, const QTime &utcTime)
static bool	hasUnquotedAP (const QString &f)
static QString	getFmtString (const QString &f, const QTime *dt=0, const QDate *dd=0, bool am_pm=false)
static QDateTimePrivate::Spec	utcToLocal (QDate &date, QTime &time)
static void	localToUtc (QDate &date, QTime &time, int isdst)
QDebug	operator<< (QDebug dbg, const QDate &date)
QDebug	operator<< (QDebug dbg, const QTime &time)
QDebug	operator<< (QDebug dbg, const QDateTime &date)
static QString	unquote (const QString &str)
static int	countRepeat (const QString &str, int index)
bool	operator== (const QDateTimeParser::SectionNode &s1, const QDateTimeParser::SectionNode &s2)
Variables
static const char	monthDays [] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
static const char *const	qt_shortMonthNames []
static const int	LowerYear = 1970

---

Define Documentation

#define QDTPDEBUG   if (false) qDebug()

Definition at line 47 of file qdatetime.cpp.

Referenced by QDateTimeParser::checkIntermediate(), QDateTimeParser::findAmPm(), QDateTimeParser::findMonth(), QDateTimeParser::parse(), QDateTimeParser::parseFormat(), QDateTimeParser::parseSection(), QDateTimeParser::potentialValueHelper(), and QDateTimeParser::sectionPos().

#define QDTPDEBUGN   if (false) qDebug

Definition at line 48 of file qdatetime.cpp.

Referenced by QDateTimeParser::parse(), QDateTimeParser::parseFormat(), and QDateTimeParser::parseSection().

---

Enumeration Type Documentation

anonymous enum

Definition at line 56 of file qdatetime.cpp.

     {
    FIRST_YEAR = -4713,
    FIRST_MONTH = 1,
    FIRST_DAY = 2,  // ### Qt 5: make FIRST_DAY = 1, by support jd == 0 as valid
    SECS_PER_DAY = 86400,
    MSECS_PER_DAY = 86400000,
    SECS_PER_HOUR = 3600,
    MSECS_PER_HOUR = 3600000,
    SECS_PER_MIN = 60,
    MSECS_PER_MIN = 60000
};

---

Function Documentation

static int countRepeat	(	const QString &	str,
		int	index
	)			[static]

Definition at line 3486 of file qdatetime.cpp.

References QString::at(), and QString::size().

Referenced by QDateTimeParser::parseFormat().

{
    Q_ASSERT(index >= 0 && index < str.size());
    int count = 1;
    const QChar ch = str.at(index);
    while (index + count < str.size() && str.at(index + count) == ch)
        ++count;
    return count;
}

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static QDate fixedDate	(	int	y,
		int	m,
		int	d
	)			[inline, static]

Definition at line 75 of file qdatetime.cpp.

References QDate::daysInMonth(), qMin(), QDate::setDate(), and strictDate().

Referenced by QDate::addMonths(), QDate::addYears(), and QDateTimeParser::setDigit().

{
    QDate result(strictDate(y, m, 1));
    result.setDate(y, m, qMin(d, result.daysInMonth()));
    return result;
}

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static QString fmtDateTime	(	const QString &	f,
		const QTime *	dt = 0,
		const QDate *	dd = 0
	)			[static]

Definition at line 3058 of file qdatetime.cpp.

References QString::at(), buf, QString::clear(), getFmtString(), hasUnquotedAP(), i, int, QString::isEmpty(), QTime::isValid(), QDate::isValid(), and QString::length().

Referenced by QDateTime::toString(), QDate::toString(), and QTime::toString().

{
    const QLatin1Char quote('\'');
    if (f.isEmpty())
        return QString();
    if (dt && !dt->isValid())
        return QString();
    if (dd && !dd->isValid())
        return QString();

    const bool ap = hasUnquotedAP(f);

    QString buf;
    QString frm;
    QChar status = QLatin1Char('0');

    for (int i = 0; i < (int)f.length(); ++i) {
        if (f.at(i) == quote) {
            if (status == quote) {
                status = QLatin1Char('0');
            } else {
                if (!frm.isEmpty()) {
                    buf += getFmtString(frm, dt, dd, ap);
                    frm.clear();
                }
                status = quote;
            }
        } else if (status == quote) {
            buf += f.at(i);
        } else if (f.at(i) == status) {
            if ((ap) && ((f.at(i) == QLatin1Char('P')) || (f.at(i) == QLatin1Char('p'))))
                status = QLatin1Char('0');
            frm += f.at(i);
        } else {
            buf += getFmtString(frm, dt, dd, ap);
            frm.clear();
            if ((f.at(i) == QLatin1Char('h')) || (f.at(i) == QLatin1Char('m'))
                || (f.at(i) == QLatin1Char('H'))
                || (f.at(i) == QLatin1Char('s')) || (f.at(i) == QLatin1Char('z'))) {
                status = f.at(i);
                frm += f.at(i);
            } else if ((f.at(i) == QLatin1Char('d')) || (f.at(i) == QLatin1Char('M')) || (f.at(i) == QLatin1Char('y'))) {
                status = f.at(i);
                frm += f.at(i);
            } else if ((ap) && (f.at(i) == QLatin1Char('A'))) {
                status = QLatin1Char('P');
                frm += f.at(i);
            } else  if((ap) && (f.at(i) == QLatin1Char('a'))) {
                status = QLatin1Char('p');
                frm += f.at(i);
            } else {
                buf += f.at(i);
                status = QLatin1Char('0');
            }
        }
    }

    buf += getFmtString(frm, dt, dd, ap);

    return buf;
}

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static void getDateFromJulianDay	(	uint	julianDay,
		int *	year,
		int *	month,
		int *	day
	)			[static]

Definition at line 107 of file qdatetime.cpp.

References d, i, j, m, n, and y.

Referenced by QDate::addMonths(), QDate::addYears(), QDate::day(), QDate::daysInMonth(), QDate::daysInYear(), QDate::julianToGregorian(), QDate::month(), QDate::toString(), and QDate::year().

{
    int y, m, d;

    if (julianDay >= 2299161) {
        // Gregorian calendar starting from October 15, 1582
        // This algorithm is from Henry F. Fliegel and Thomas C. Van Flandern
        qulonglong ell, n, i, j;
        ell = qulonglong(julianDay) + 68569;
        n = (4 * ell) / 146097;
        ell = ell - (146097 * n + 3) / 4;
        i = (4000 * (ell + 1)) / 1461001;
        ell = ell - (1461 * i) / 4 + 31;
        j = (80 * ell) / 2447;
        d = ell - (2447 * j) / 80;
        ell = j / 11;
        m = j + 2 - (12 * ell);
        y = 100 * (n - 49) + i + ell;
    } else {
        // Julian calendar until October 4, 1582
        // Algorithm from Frequently Asked Questions about Calendars by Claus Toendering
        julianDay += 32082;
        int dd = (4 * julianDay + 3) / 1461;
        int ee = julianDay - (1461 * dd) / 4;
        int mm = ((5 * ee) + 2) / 153;
        d = ee - (153 * mm + 2) / 5 + 1;
        m = mm + 3 - 12 * (mm / 10);
        y = dd - 4800 + (mm / 10);
        if (y <= 0)
            --y;
    }
    *year = y;
    *month = m;
    *day = d;
}

static QString getFmtString	(	const QString &	f,
		const QTime *	dt = 0,
		const QDate *	dd = 0,
		bool	am_pm = false
	)			[static]

Definition at line 2959 of file qdatetime.cpp.

References QString::at(), buf, QString::isEmpty(), QChar::isUpper(), QString::mid(), QString::number(), QTextStream::right(), QString::size(), QString::startsWith(), QChar::toUpper(), and QUnicodeTables::upper().

Referenced by fmtDateTime().

{
    if (f.isEmpty())
        return QString();

    QString buf = f;
    int removed = 0;

    if (dt) {
        if (f.startsWith(QLatin1String("hh")) || f.startsWith(QLatin1String("HH"))) {
            const bool hour12 = f.at(0) == QLatin1Char('h') && am_pm;
            if (hour12 && dt->hour() > 12)
                buf = QString::number(dt->hour() - 12).rightJustified(2, QLatin1Char('0'), true);
            else if (hour12 && dt->hour() == 0)
                buf = QLatin1String("12");
            else
                buf = QString::number(dt->hour()).rightJustified(2, QLatin1Char('0'), true);
            removed = 2;
        } else if (f.at(0) == QLatin1Char('h') || f.at(0) == QLatin1Char('H')) {
            const bool hour12 = f.at(0) == QLatin1Char('h') && am_pm;
            if (hour12 && dt->hour() > 12)
                buf = QString::number(dt->hour() - 12);
            else if (hour12 && dt->hour() == 0)
                buf = QLatin1String("12");
            else
                buf = QString::number(dt->hour());
            removed = 1;
        } else if (f.startsWith(QLatin1String("mm"))) {
            buf = QString::number(dt->minute()).rightJustified(2, QLatin1Char('0'), true);
            removed = 2;
        } else if (f.at(0) == (QLatin1Char('m'))) {
            buf = QString::number(dt->minute());
            removed = 1;
        } else if (f.startsWith(QLatin1String("ss"))) {
            buf = QString::number(dt->second()).rightJustified(2, QLatin1Char('0'), true);
            removed = 2;
        } else if (f.at(0) == QLatin1Char('s')) {
            buf = QString::number(dt->second());
        } else if (f.startsWith(QLatin1String("zzz"))) {
            buf = QString::number(dt->msec()).rightJustified(3, QLatin1Char('0'), true);
            removed = 3;
        } else if (f.at(0) == QLatin1Char('z')) {
            buf = QString::number(dt->msec());
            removed = 1;
        } else if (f.at(0).toUpper() == QLatin1Char('A')) {
            const bool upper = f.at(0) == QLatin1Char('A');
            buf = dt->hour() < 12 ? QLatin1String("am") : QLatin1String("pm");
            if (upper)
                buf = buf.toUpper();
            if (f.size() > 1 && f.at(1).toUpper() == QLatin1Char('P') &&
                f.at(0).isUpper() == f.at(1).isUpper()) {
                removed = 2;
            } else {
                removed = 1;
            }
        }
    }

    if (dd) {
        if (f.startsWith(QLatin1String("dddd"))) {
            buf = dd->longDayName(dd->dayOfWeek());
            removed = 4;
        } else if (f.startsWith(QLatin1String("ddd"))) {
            buf = dd->shortDayName(dd->dayOfWeek());
            removed = 3;
        } else if (f.startsWith(QLatin1String("dd"))) {
            buf = QString::number(dd->day()).rightJustified(2, QLatin1Char('0'), true);
            removed = 2;
        } else if (f.at(0) == QLatin1Char('d')) {
            buf = QString::number(dd->day());
            removed = 1;
        } else if (f.startsWith(QLatin1String("MMMM"))) {
            buf = dd->longMonthName(dd->month());
            removed = 4;
        } else if (f.startsWith(QLatin1String("MMM"))) {
            buf = dd->shortMonthName(dd->month());
            removed = 3;
        } else if (f.startsWith(QLatin1String("MM"))) {
            buf = QString::number(dd->month()).rightJustified(2, QLatin1Char('0'), true);
            removed = 2;
        } else if (f.at(0) == QLatin1Char('M')) {
            buf = QString::number(dd->month());
            removed = 1;
        } else if (f.startsWith(QLatin1String("yyyy"))) {
            buf = QString::number(dd->year());
            removed = 4;
        } else if (f.startsWith(QLatin1String("yy"))) {
            buf = QString::number(dd->year()).right(2);
            removed = 2;
        }
    }
    if (removed == 0 || removed >= f.size()) {
        return buf;
    }

    return buf + getFmtString(f.mid(removed), dt, dd, am_pm);
}

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static bool hasUnquotedAP

(

const QString &

f

)

[static]

Definition at line 2939 of file qdatetime.cpp.

References QString::at(), i, QString::size(), and QChar::toUpper().

Referenced by fmtDateTime(), and QDateTimeParser::parseFormat().

{
    const QLatin1Char quote('\'');
    bool inquote = false;
    for (int i=0; i < f.size(); ++i) {
        if (f.at(i) == quote) {
            inquote = !inquote;
        } else if (!inquote && f.at(i).toUpper() == QLatin1Char('A')) {
            return true;
        }
    }
    return false;
}

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static uint julianDayFromDate	(	int	year,
		int	month,
		int	day
	)			[static]

Definition at line 82 of file qdatetime.cpp.

References a.

Referenced by QDate::currentDate(), QDateTime::currentDateTime(), QDate::dayOfYear(), QDate::gregorianToJulian(), and QDate::setDate().

{
    if (year < 0)
        ++year;

    if (year > 1582 || (year == 1582 && (month > 10 || (month == 10 && day >= 15)))) {
        // Gregorian calendar starting from October 15, 1582
        // Algorithm from Henry F. Fliegel and Thomas C. Van Flandern
        return (1461 * (year + 4800 + (month - 14) / 12)) / 4
               + (367 * (month - 2 - 12 * ((month - 14) / 12))) / 12
               - (3 * ((year + 4900 + (month - 14) / 12) / 100)) / 4
               + day - 32075;
    } else if (year < 1582 || (year == 1582 && (month < 10 || (month == 10 && day <= 4)))) {
        // Julian calendar until October 4, 1582
        // Algorithm from Frequently Asked Questions about Calendars by Claus Toendering
        int a = (14 - month) / 12;
        return (153 * (month + (12 * a) - 3) + 2) / 5
               + (1461 * (year + 4800 - a)) / 4
               + day - 32083;
    } else {
        // the day following October 4, 1582 is October 15, 1582
        return 0;
    }
}

static void localToUtc	(	QDate &	date,
		QTime &	time,
		int	isdst
	)			[static]

Definition at line 3172 of file qdatetime.cpp.

References QDate::day(), QDate::daysTo(), QTime::hour(), int, QDate::isValid(), LowerYear, QTime::minute(), QDate::month(), QTime::msec(), QTime::second(), and QDate::year().

Referenced by QDateTimePrivate::getUTC().

{
    if (!date.isValid())
        return;

    QDate lowerLimit(LowerYear, 1, 2);
    QDate upperLimit(2037, 12, 30);

    QDate fakeDate = date;

    if (fakeDate < lowerLimit) {
        fakeDate = lowerLimit;
        isdst = false;
    } else if (fakeDate > upperLimit) {
        fakeDate = upperLimit;
        isdst = false;
    }

    tm localTM;
    localTM.tm_sec = time.second();
    localTM.tm_min = time.minute();
    localTM.tm_hour = time.hour();
    localTM.tm_mday = fakeDate.day();
    localTM.tm_mon = fakeDate.month() - 1;
    localTM.tm_year = fakeDate.year() - 1900;
    localTM.tm_isdst = (int)isdst;

    time_t secsSince1Jan1970UTC = mktime(&localTM);
    tm *brokenDown = 0;

#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
    // use the reentrant version of gmtime() where available
    tm res;
    brokenDown = gmtime_r(&secsSince1Jan1970UTC, &res);
#elif defined(_MSC_VER) && _MSC_VER >= 1400
    tm res;
    if (!_gmtime64_s(&res, &secsSince1Jan1970UTC))
        brokenDown = &res;
#else
    brokenDown = gmtime(&secsSince1Jan1970UTC);
#endif // !QT_NO_THREAD && _POSIX_THREAD_SAFE_FUNCTIONS
    if (!brokenDown) {
        date = QDate(1970, 1, 1);
        time = QTime();
    } else {
        int deltaDays = fakeDate.daysTo(date);
        date = QDate(brokenDown->tm_year + 1900, brokenDown->tm_mon + 1, brokenDown->tm_mday);
        time = QTime(brokenDown->tm_hour, brokenDown->tm_min, brokenDown->tm_sec, time.msec());
        date = date.addDays(deltaDays);
    }
}

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QDebug operator<<	(	QDebug	dbg,
		const QDateTime &	date
	)

Definition at line 3254 of file qdatetime.cpp.

{
    dbg.nospace() << "QDateTime(" << date.toString() << ")";
    return dbg.space();
}

QDebug operator<<	(	QDebug	dbg,
		const QTime &	time
	)

Definition at line 3248 of file qdatetime.cpp.

{
    dbg.nospace() << "QTime(" << time.toString() << ")";
    return dbg.space();
}

QDebug operator<<	(	QDebug	dbg,
		const QDate &	date
	)

Definition at line 3242 of file qdatetime.cpp.

{
    dbg.nospace() << "QDate(" << date.toString() << ")";
    return dbg.space();
}

bool operator==	(	const QDateTimeParser::SectionNode &	s1,
		const QDateTimeParser::SectionNode &	s2
	)

Definition at line 4781 of file qdatetime.cpp.

{
    return (s1.type == s2.type) && (s1.pos == s2.pos) && (s1.count == s2.count);
}

static QDate strictDate	(	int	y,
		int	m,
		int	d
	)			[inline, static]

Definition at line 68 of file qdatetime.cpp.

References QDate::setDate().

Referenced by fixedDate(), QDate::fromString(), QDateTime::fromString(), and QDateTimeParser::parse().

{
    QDate result;
    result.setDate(y, m, d);
    return result;
}

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static uint toTime_t	(	const QDate &	utcDate,
		const QTime &	utcTime
	)			[static]

Definition at line 2019 of file qdatetime.cpp.

References Q_INT64_C, and SECS_PER_DAY.

Referenced by ConnectionManager::clientId(), QUuid::createUuid(), QDateTime::toTime_t(), utcToLocal(), writeAdaptor(), and writeProxy().

{
    int days = QDate(1970, 1, 1).daysTo(utcDate);
    int secs = QTime().secsTo(utcTime);
    if (days < 0 || (days == 0 && secs < 0))
        return uint(-1);

    qlonglong retval = (qlonglong(days) * SECS_PER_DAY) + secs;
    if (retval >= Q_INT64_C(0xFFFFFFFF))
        return uint(-1);
    return uint(retval);
}

static QString unquote

(

const QString &

str

)

[static]

Definition at line 3456 of file qdatetime.cpp.

References QString::at(), i, QString::isEmpty(), and QString::size().

Referenced by QDateTimeParser::parseFormat(), split_arg_list(), and ProFileEvaluator::visitProValue().

{
    const QLatin1Char quote('\'');
    const QLatin1Char slash('\\');
    const QLatin1Char zero('0');
    QString ret;
    QChar status = zero;
    for (int i=0; i<str.size(); ++i) {
        if (str.at(i) == quote) {
            if (status != quote) {
                status = quote;
            } else if (!ret.isEmpty() && str.at(i - 1) == slash) {
                ret[ret.size() - 1] = quote;
            } else {
                status = zero;
            }
        } else {
            ret += str.at(i);
        }
    }
    return ret;
}

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static QDateTimePrivate::Spec utcToLocal	(	QDate &	date,
		QTime &	time
	)			[static]

Definition at line 3127 of file qdatetime.cpp.

References QDate::daysTo(), QDateTimePrivate::LocalDST, QDateTimePrivate::LocalStandard, QDateTimePrivate::LocalUnknown, LowerYear, QTime::msec(), and toTime_t().

Referenced by QDateTimePrivate::getLocal().

{
    QDate lowerLimit(LowerYear, 1, 2);
    QDate upperLimit(2037, 12, 30);

    QDate fakeDate = date;

    if (fakeDate < lowerLimit) {
        fakeDate = lowerLimit;
    } else if (fakeDate > upperLimit) {
        fakeDate = upperLimit;
    }

    time_t secsSince1Jan1970UTC = toTime_t(fakeDate, time);
    tm *brokenDown = 0;

#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS)
    // use the reentrant version of localtime() where available
    tm res;
    brokenDown = localtime_r(&secsSince1Jan1970UTC, &res);
#elif defined(_MSC_VER) && _MSC_VER >= 1400
    tm res;
    if (!_localtime64_s(&res, &secsSince1Jan1970UTC))
        brokenDown = &res;
#else
    brokenDown = localtime(&secsSince1Jan1970UTC);
#endif
    if (!brokenDown) {
        date = QDate(1970, 1, 1);
        time = QTime();
        return QDateTimePrivate::LocalUnknown;
    } else {
        int deltaDays = fakeDate.daysTo(date);
        date = QDate(brokenDown->tm_year + 1900, brokenDown->tm_mon + 1, brokenDown->tm_mday);
        time = QTime(brokenDown->tm_hour, brokenDown->tm_min, brokenDown->tm_sec, time.msec());
        date = date.addDays(deltaDays);
        if (brokenDown->tm_isdst > 0)
            return QDateTimePrivate::LocalDST;
        else if (brokenDown->tm_isdst < 0)
            return QDateTimePrivate::LocalUnknown;
        else
            return QDateTimePrivate::LocalStandard;
    }
}

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---

Variable Documentation

const int LowerYear = 1970 [static]

Definition at line 3124 of file qdatetime.cpp.

Referenced by localToUtc(), and utcToLocal().

const char monthDays[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } [static]

Definition at line 144 of file qdatetime.cpp.

Referenced by QDate::daysInMonth(), and QDate::isValid().

const char* const qt_shortMonthNames[] [static]

Initial value:

 {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }

Definition at line 147 of file qdatetime.cpp.

Referenced by QDateTimeParser::findMonth(), QDate::fromString(), and QDateTime::fromString().

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