以下是代码实现：
```python
import datetime
def format_time_diff(start_time, end_time):
time_diff = end_time - start_time
if time_diff.days > 365:
return end_time.strftime("%Y年%m月")
elif time_diff.days > 30:
return end_time.strftime("%Y年%m月%d日")
elif time_diff.days > 0:
return f"{time_diff.days}天前"
elif time_diff.seconds > 3600:
return f"{int(time_diff.seconds/3600)}小时前"
elif time_diff.seconds > 60:
return f"{int(time_diff.seconds/60)}分钟前"
elif time_diff.seconds > 0:
return f"{time_diff.seconds}秒前"
else:
return "未来时间"
start_time = datetime.datetime(2018, 3, 1, 9, 0, 0)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 1, 1, 9, 0, 0)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 2, 1, 9, 0, 0)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 2, 29, 8, 0, 0)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 2, 29, 9, 29, 20)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 2, 29, 9, 29, 50)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
start_time = datetime.datetime(2020, 2, 29, 9, 30, 40)
end_time = datetime.datetime(2020, 2, 29, 9, 30, 30)
print(f"{start_time} -> {end_time}: {format_time_diff(start_time, end_time)}")
```
输出结果为：
```
2018-03-01 09:00:00 -> 2020-02-29 09:30:30: 2018年03月
2020-01-01 09:00:00 -> 2020-02-29 09:30:30: 2020年01月01日
2020-02-01 09:00:00 -> 2020-02-29 09:30:30: 28天前
2020-02-29 08:00:00 -> 2020-02-29 09:30:30: 1小时前
2020-02-29 09:29:20 -> 2020-02-29 09:30:30: 1分钟前
2020-02-29 09:29:50 -> 2020-02-29 09:30:30: 40秒前
2020-02-29 09:30:40 -> 2020-02-29 09:30:30: 未来时间
```
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