Python - Date and Time

-1. Date and Time Example

import calendar
from datetime import date
from datetime import datetime
from datetime import timedelta

if __name__ == '__main__':
    # date:
    today = date.today()
    print("Today is ", today)

    print(today.day, today.month, today.year)

    print(today.weekday())

    days = ["mon", 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'];
    print(days[today.weekday()])

    # datetime:
    today = datetime.now()
    print("Today is ", today)

    t = datetime.time(datetime.now())
    print(t)

    # datetime format:
    now = datetime.now()
    print((now.strftime("%Y")))
    print((now.strftime("%a, %d %B, %y")))
    print(now.strftime("Locale date and time: %c"))
    print(now.strftime("Locale date : %x"))
    print(now.strftime("Locale time: %X"))

    # time format:
    print(now.strftime("%I:%M:%S %p"))
    print(now.strftime("%H:%M"))

    # time delta时间间隔
    print(timedelta(days=365, hours=5, minutes=1))

    now = datetime.now()
    print("Today is ", str(now))
    print("one year from now: " + str(now + timedelta(days=365)))
    print(str(now + timedelta(days=2, weeks=3)))

    t = datetime.now() - timedelta(weeks=1)
    s = t.strftime("%A %B %d, %Y")
    print(s)

    today = date.today()
    afd = date(today.year, 4, 1)
    print(str(today))
    print(str(afd))
    if afd < today:
        print("04/01 has gone %d" % (today - afd).days)
        afd = afd.replace(year=today.year + 1)
        print(afd)

    time_to_aft = afd - today
    print(time_to_aft)

    # calendar
    c = calendar.TextCalendar(calendar.SUNDAY)
    st = c.formatmonth(2017, 1, 0, 0)
    print(st)

    hc = calendar.HTMLCalendar(calendar.MONDAY)
    st = hc.formatmonth(2017, 1)
    print(st)

    for i in c.itermonthdays(2017, 1):
        print(i)

    for name in calendar.month_name:
        print(name)

    for day in calendar.day_name:
        print(day)

    # 1st Friday in each month
    for m in range(1, 13):
        cal = calendar.monthcalendar(2019, m)
        weekone = cal[0]
        weektwo = cal[1]

        if weekone[calendar.FRIDAY] != 0:
            meetday = weekone[calendar.FRIDAY]
        else:
            meetday = weektwo[calendar.FRIDAY]

        print("%10s %2d" % (calendar.month_name[m], meetday))