time与datetime模块

import time

time.sleep(5)
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程序停止5秒
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print(time.time())
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时间戳：1495539499.9574285
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print(time.ctime())                   # 字符串格式
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Tue May 23 19:38:19 2017
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print(time.ctime(time.time()-86400))  # 减去一天的秒数，将时间戳转换成字符串时间
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Mon May 22 19:38:19 2017
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# 将时间戳转换成时间对象格式
time_obj = time.gmtime(time.time())
print(time_obj)
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time.struct_time(tm_year=2017, tm_mon=5, tm_mday=23, tm_hour=11, tm_min=38, tm_sec=19, tm_wday=1, tm_yday=143, tm_isdst=0)
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print(time_obj.tm_year)
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2017
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print(str(time_obj.tm_year) + ‘-‘ + str(time_obj.tm_mon) + ‘-‘ + str(time_obj.tm_mday))
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2017-5-23
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# 字符串格式化
print("%s-%s-%s %s:%s" % (time_obj.tm_year, time_obj.tm_mon, time_obj.tm_mday, time_obj.tm_hour, time_obj.tm_min))
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2017-5-23 11:38
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print("%d-%f-%d %d:%d" % (time_obj.tm_year, time_obj.tm_mon, time_obj.tm_mday, time_obj.tm_hour, time_obj.tm_min))
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2017-5.000000-23 11:38
%d只能接收整型数剧，但是%s都可以各种类型的数据
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# 本地时间  输出一个时间对象
print(time.localtime(time.time()))
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time.struct_time(tm_year=2017, tm_mon=5, tm_mday=23, tm_hour=19, tm_min=38, tm_sec=19, tm_wday=1, tm_yday=143, tm_isdst=0)
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# 将时间对象转换成时间戳
print(time.mktime(time.localtime()))
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1495539499.0
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# 将时间对象格式转换成指定的字符串格式
print(time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime()))
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2017-05-23 11:38:19
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print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
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2017-05-23 19:38:19
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# 将字符串格式转换成时间对象格式
print(time.strptime("2016-01-28", "%Y-%m-%d"))
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time.struct_time(tm_year=2016, tm_mon=1, tm_mday=28, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=28, tm_isdst=-1)
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import datetime

print(datetime.date.today())
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2017-05-23
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print(datetime.date.fromtimestamp(time.time()-664000000))
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1996-05-08
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current_time = datetime.datetime.now()
print(current_time)
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2017-05-23 19:38:20.001431
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print(current_time.timetuple()) # 返回时间对象格式
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time.struct_time(tm_year=2017, tm_mon=5, tm_mday=23, tm_hour=19, tm_min=38, tm_sec=20, tm_wday=1, tm_yday=143, tm_isdst=-1)
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print(current_time.replace(2014, 12, 12))# 输出当前时间，指定值被替换
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2014-12-12 19:38:20.001431
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str_to_date = datetime.datetime.strptime("21/11/06 16:30", "%d/%m/%y %H:%M")#将字符串转换成日期的字符串格式
print(str_to_date)
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2006-11-21 16:30:00
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# 时间的加减  用得很多
new_date0 = datetime.datetime.now() + datetime.timedelta(days=-10)  #减10天
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new_date1 = datetime.datetime.now() + datetime.timedelta(hours=-10) #减10个小时
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new_date2 = datetime.datetime.now() + datetime.timedelta(seconds=-10) # 减10秒
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