django时间过滤器返回年月周日

@register.filter()

def changetime(value):

a=datetime.datetime.now()

         #datetime类型有一个时区属性tzinfo,但是默认为None

b=value.replace(tzinfo=None)

if a.year-b.year>0:

return str(a.year-b.year)+"年"

elif a.month-b.month>0:

return str(a.month-b.month) + "月"

elif a.day - b.day > 0 and a.day - b.day>7:

return str(int((a.day - b.day)/7)) + "周"

elif a.day - b.day > 1:

return str(a.day - b.day) + "天"

elif a.hour - b.hour > 0:

return str(a.hour - b.hour) + "小时"

else:

return "短时间"