从开始时间开始循环几个月

时间:2011-04-12 21:11:06

标签: python date

我想在给定的开始时间之后循环几个月,并打印第一天和最后一天。我可以手动跟踪它是哪个月份和年份,并使用calendar.monthrange(年,月)来获取天数......但这是最好的方法吗?

from datetime import date
start_date = date(2010, 8, 1)
end_date = date.today()
# I want to loop through each month and print the first and last day of the month
# 2010, 8, 1 to 2010, 8, 31
# 2010, 9, 1 to 2010, 9, 30
# ....
# 2011, 3, 1 to 2011, 3, 31
# 2011, 4, 1, to 2011, 4, 12 (ends early because it is today)

4 个答案:

答案 0 :(得分:1)

要查找一个月的最后一天,您可以使用first_of_next_month - datetime.timedelta(1)。例如:

def enumerate_month_dates(start_date, end_date):
    current = start_date
    while current <= end_date:
        if current.month >= 12:
            next = datetime.date(current.year + 1, 1, 1)
        else:
            next = datetime.date(current.year, current.month + 1, 1)
        last = min(next - datetime.timedelta(1), end_date)
        yield current, last
        current = next

答案 1 :(得分:0)

答案 2 :(得分:0)

嗯,在公历中,任何月份的第一天编号为1,最后一天是下个月的第一天减1。因此,以最微不足道的形式:

d = datetime.date(2010, m, 1)
print d, datetime.date(2010, m + 1, 1) - datetime.timedelta(days=1)

(这在12月不起作用,因为date()的月份参数需要在1..12)

答案 3 :(得分:0)

  1. 从开始日期的第一天开始
  2. 计算当月的天数并开始下个月
  3. 打印开始日期和(下个月开始 - 1天)
  4. 这有效:

    #!/usr/bin/python
    from datetime import date, timedelta
    import calendar
    start_date = date(2001,8,1)
    end_date = date.today()
    while True:
        if start_date > end_date:
            break
        days_in_month = calendar.monthrange(start_date.year, start_date.month)[1]  # Calculate days in month for start_date
        new_ts = calendar.timegm(start_date.timetuple()) + (days_in_month * 24 * 60 * 60)  # Get timestamp for start of next month
        new_start_date = date(1,1,1).fromtimestamp(new_ts) # Convert timestamp to date object
        print start_date, new_start_date - timedelta(1)
        start_date = new_start_date