PyQt5 Date and Time 学习

QDate, QTime, QDateTime
PyQt5 has QDate, QDateTime, QTime classes to work with date and time. The QDate is a class for working with a calendar date in the Gregorian calendar. It has methods for determining the date, comparing, or manipulating dates. The QTime class works with a clock time. It provides methods for comparing time, determining the time and various other time manipulating methods. The QDateTime is a class that combines both QDate and QTime objects into one object.

# coding='utf-8'

from PyQt5.QtCore import QDate, QTime, QDateTime, Qt

class Tests:
    def __init__(self):
        pass

    # Qdate,QTime,QDateTime测试
    def test1(self):
        # QDate是日期,currentDate返回当前日期(几月几日)
        now = QDate.currentDate()
        # print(now.toString())
        # Qt.ISODate和Qt.DefaultLocaleLongDate是让日期用两种不同格式输出
        print(now.toString(Qt.ISODate))
        print(now.toString(Qt.DefaultLocaleLongDate))

        # QdateTime是日期加上时间的组合(几月几日星期几,什么时间),
        # currentDateTime返回当前的日期与时间
        date_time = QDateTime.currentDateTime()
        print(date_time.toString())

        # Qtime是时间,currentTime返回当前时间(几点钟)
        time = QTime.currentTime()
        # print(time.toString())
        # 将当前时间用不同的格式输出
        print(time.toString(Qt.DefaultLocaleLongDate))

    # 本地时间与国际时间
    def test2(self):
        date_time = QDateTime.currentDateTime()
        print('本地时间:{}'.format(date_time.toString(Qt.ISODate)))
        # toUTC funciton将给定时间转化成国际时间
        print('国际时间:{}'.format(date_time.toUTC().toString(Qt.ISODate)))
        # offsetFromTtc返回给定时间和国际时间的差值
        print('两者偏差:{}秒.'.format(date_time.offsetFromUtc()))

    # 计算本月本年天数
    def test3(self):
        date = QDate.currentDate()
        print('本月有{}天'.format(date.daysInMonth()))
        print('本年有{}天'.format(date.daysInYear()))

    # 计算两个Date之间相差的天数
    def test4(self):
        d1 = QDate.currentDate()
        d2 = QDate(2000, 7, 26)
        print('从{}您出生到今天{},一共过去了{}天.'.
              format(d2.toString(Qt.DefaultLocaleLongDate),
                     d1.toString(Qt.DefaultLocaleLongDate),
                     d2.daysTo(d1)))
        print('您距离下一个生日还有{}天'.
              format(d1.daysTo(QDate(2020, 7, 26))))

    # DateTime加减天数,秒钟,月份,年份测试
    def test5(self):
        now = QDateTime.currentDateTime()
        # now = QDateTime(2000, 2, 29, 2, 45, 30)
        print('当前时间:{}'.format(now.toString(Qt.ISODate)))
        print('加上{}天后:{}'.format(35, now.addDays(35).toString(Qt.ISODate)))
        print('减去{}天后:{}'.format(15, now.addDays(-15).toString(Qt.ISODate)))
        print('加上{}秒后:{}'.format(3600, now.addSecs(3600).toString(Qt.ISODate)))
        print('加上{}月后:{}'.format(24, now.addMonths(24).toString(Qt.ISODate)))
        print('加上{}年后:{}'.format(8, now.addYears(8).toString(Qt.ISODate)))

    # Daylight saving time 测试(在夏季月份把时间提前,从而夜晚的白天时间更长,大概测试是不是夏天)
    def test6(self):
        now = QDateTime.currentDateTime()
        # timeZoneAbbreviation 返回当前时间的时区
        print('时区:{}'.format(now.timeZoneAbbreviation()))
        # 可能是判断是不是在当前时区的夏天吧
        if now.isDaylightTime():
            print('当前时间在DST time里.')
        else:
            print('当前时间不在DST time里.')

    # Unix epoch测试, Unix epoch大概是1970- 01-01T00:00:00Z ISO 8601
    # 可以利用Unix epoch获得Unix time(从Unix epoch到现在过了多久的一个纯数字,秒钟)
    def test7(self):
        now = QDateTime.currentDateTime()
        unix_time = now.toSecsSinceEpoch()
        print('从Unix epoch到现在过去了{}秒钟'.format(unix_time))
        # 从unix time转成datetime
        d = QDateTime.fromSecsSinceEpoch(unix_time)
        print('当前时间:', d.toString(Qt.ISODate))

    # Julian day
    # Julian day refers to a continuous count of \
    # days since the beginning of the Julian Period
    def test8(self):
        now = QDate.currentDate()
        print('当前日期的格林尼治时间:{}'.format(now.toString(Qt.ISODate)))
        print('当前日期的Julian时间:{}'.format(now.toJulianDay()))

    # Historical battles
    # 计算时间跨度即使跨国几个世纪利用Julian day
    def test9(self):
        # 两个历史上的战役日期
        borodino_battle = QDate(1812, 9, 7)
        slavkov_battle = QDate(1805, 12, 2)
        # 当前日期
        now = QDate.currentDate()
        j_today = now.toJulianDay()
        j_borodino = borodino_battle.toJulianDay()
        j_slavkov = slavkov_battle.toJulianDay()
        # 计算第一个战争和当前时间在julian day下的跨度
        d1 = j_today - j_borodino
        # 计算美国奴隶战争和当前时间在julian day下的跨度
        d2 = j_today - j_slavkov
        # 输出差值
        print('从Borodino战争到今天过去了:{}天'.format(d1))
        print('从美国奴隶战争到今天过去了:{}天'.format(d2))


# Tests().test1()
# Tests().test2()
# Tests().test3()
# Tests().test4()
# Tests().test5()
# Tests().test6()
# Tests().test7()
# Tests().test8()
# Tests().test9()

运行结果： image.png
image.png