python - 如何计算距特定日期还剩几个月？

Question

在我的 django 应用程序中，我有一些约会。 我需要使用完整(四舍五入)月份来计算距此日期还剩多少个月。 例如:今天是 19/02/2015(二月)，我的“搜索”日期是 04/08/2015。差值应为 6。 如何获得正确的值？

Answer 1

from datetime import datetime,timedelta
from calendar import monthrange

today = datetime.today()
dt = "04/08/2015"

fut = datetime.strptime(dt, "%d/%m/%Y")
diff = 0
while today <= fut:
    today += timedelta(days=monthrange(today.day,today.month)[1])
    diff += 1
print(diff)
6

无需导入日历，我们可以在每次看到新月份时增加计数:

from datetime import datetime,timedelta

today = datetime.today() 
dt = "09/08/2015"

fut = datetime.strptime(dt, "%d/%m/%Y")
diff = 0
while today <= fut:
    mon = today.month
    today += timedelta(days=1)
    if today.month != mon:
        diff += 1
print(diff)
6

如果您想让 future 的一天成为该月的最后一天:

from datetime import datetime, timedelta
from calendar import monthrange

today = datetime.today()
dt = "02/08/2015"

fut = datetime.strptime(dt, "%d/%m/%Y")
fut = fut + timedelta(days=monthrange(fut.day,fut.month)[1]-fut.day)
diff = 0
while today < fut:
    mon = today.month
    today += timedelta(days=1)
    if today.month != mon:
        diff += 1
print(diff)

这是故意不准确的，以便根据需要进行舍入，我们所关心的是我们遇到的不同月份的数量。