# -*- coding:utf-8 -*-
from datetime import datetime

# 日期格式話模版
format_pattern = "%Y-%m-%d %H:%M:%S"

# 具體日期 年/月/日 時/分/秒
start_date = "2018-07-09 13:20:38"

end_date = datetime.now()
print(end_date) # datetime.datetime(2018, 10, 15, 11, 19, 52, 186250)
print(type(end_date)) # <type 'datetime.datetime'>

# 將 'datetime.datetime' 型別時間通過格式化模式轉換為 'str' 時間
 

end_date = end_date.strftime(format_pattern)
print(end_date, type(end_date)) # ('2018-10-15 11:21:44', <type 'str'>)

# 將 'str' 時間通過格式化模式轉化為 'datetime.datetime' 時間戳, 然後在進行比較
difference = (datetime.strptime(end_date, format_pattern) - datetime.strptime(start_date, format_pattern))

# 可以獲取天(days), 或者秒(seconds)
 

print(difference)

print(difference.seconds)
print(difference.days)