add python_datetime.py

Author: xianhu

README.md

@@ -21,6 +21,8 @@
 ### python_functional.py: Python进阶: 函数式编程实例（附代码）
 
 ### python_decorator.py: Python进阶: 通过实例详解装饰器（附代码）
+
+### python_datetime.py: 你真的了解Python中的日期时间处理吗？
 ===============================================================================
 
 ### 您可以fork该项目,并在修改后提交Pull request

python_datetime.py

@@ -0,0 +1,54 @@
+# _*_ coding: utf-8 _*_
+
+import time
+import calendar
+import datetime
+
+
+# time模块中的三种时间形式
+print("time stamp:", time.time()) # 时间戳
+print("local time:", time.localtime()) # struct_time类型的本地时间
+print("utc time:", time.gmtime()) # struct_time类型的utc时间
+
+# time模块中，三种时间形式之间的转换
+time_stamp = time.time() # 时间戳
+local_time = time.localtime(time_stamp) # 时间戳转struct_time类型的本地时间
+utc_time = time.gmtime(time_stamp) # 时间戳转struct_time类型的utc时间
+
+time_stamp_1 = time.mktime(local_time) # struct_time类型的本地时间转时间戳
+time_stamp_2 = calendar.timegm(utc_time) # struct_time类型的utc时间转时间戳
+print(time_stamp, time_stamp_1, time_stamp_2)
+
+
+# time模块中，三种时间形式和字符串之间的转换
+print(time.ctime(time_stamp)) # 时间戳转字符串(本地时间字符串)
+
+print(time.asctime(local_time)) # struct_time类型的本地时间转字符串
+print(time.asctime(utc_time)) # struct_time类型的utc时间转字符串
+
+print(time.strftime("%Y-%m-%d, %H:%M:%S, %w", local_time)) # struct_time类型的本地时间转字符串：自定义格式
+print(time.strftime("%Y-%m-%d, %H:%M:%S, %w", utc_time)) # struct_time类型的utc时间转字符串：自定义格式
+
+struct_time = time.strptime("2016-11-15, 15:32:12, 2", "%Y-%m-%d, %H:%M:%S, %w") # 字符串转struct_time类型
+
+
+# datetime模块中datetime类的用法
+a_datetime_local = datetime.datetime.now() # 获取datetime.datetime类型的本地时间
+a_datetime_utc = datetime.datetime.utcnow() # 获取datetime.datetime类型的utc时间
+
+print(a_datetime_local.strftime("%Y-%m-%d, %H:%M:%S, %w")) # datetime.datetime类型转字符串
+print(a_datetime_utc.strftime("%Y-%m-%d, %H:%M:%S, %w")) # datetime.datetime类型转字符串
+
+a_datetime = datetime.datetime.strptime("2016-11-15, 15:32:12, 2", "%Y-%m-%d, %H:%M:%S, %w") # 字符串转datetime.datetime格式
+
+
+# datetime.datetime类和时间戳、struct_time类型之间的转换
+time_stamp = a_datetime_local.timestamp() # datetime类型转时间戳
+print(time_stamp)
+
+a_datetime_local = datetime.datetime.fromtimestamp(time.time()) # 时间戳转datetime.datetime类型的本地时间
+a_datetime_utc = datetime.datetime.utcfromtimestamp(time.time()) # 时间戳转datetime.datetime类型的utc时间
+print(a_datetime_local, a_datetime_utc)
+
+print(a_datetime_local.timetuple()) # datetime类型转struct_time类型
+print(a_datetime_utc.utctimetuple()) # datetime类型转struct_time类型