python实现当前时间后推三个月

由当前时间向后推3个月

def index_time():
    end_time = time.time()
    end_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(end_time))
    date_list_1 = end_date.split('-')
    date_list_2 = date_list_1[2].split(' ')
    date_d = date_list_2[0]
    date_Y = date_list_1[0]
    date_m = date_list_1[1]
    print('当前的年份', date_Y)
    print('当前的月份', date_m)
    print('当前日期',date_d)
    if int(date_Y) % 4 == 0:
        print('润年2月29天')
        if date_m in ['1', '2', '6', '8', '9', '10', '11']:
            if date_d in ['31']:
                start_time = end_time - 86400 * 93
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
        elif date_m in ['3', '4', '7', '12']:
            if date_d in ['31']:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 91
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
        else:
            if date_d in ['30']:
                start_time = end_time - 86400 * 91
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            elif date_d in ['31']:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 90
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
    else:
        print('非润年2月28天')
        if date_m in ['1', '2', '6', '8', '9', '10', '11']:
            if date_d in ['31']:
                start_time = end_time - 86400 * 93
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
        elif date_m in ['7', '12']:
            if date_d in ['31']:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 91
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
        elif date_m in ['3', '4']:
            if date_d in ['31']:
                start_time = end_time - 86400 * 91
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 90
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
        else:
            if date_d in ['29']:
                start_time = end_time - 86400 * 90
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            elif date_d in ['30']:
                start_time = end_time - 86400 * 91
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            elif date_d in ['31']:
                start_time = end_time - 86400 * 92
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
            else:
                start_time = end_time - 86400 * 89
                start_date = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
    print('开始时间', start_date)
    print('开始时间', end_date)
    return end_date, start_date