时间的三种形式：
时间戳（秒），元组形式，字符串形式
import time x = time.time() # 以时间戳形式，返回当前时间 print(x) # 1515306968.886664 print(time.clock()) # 0.0 time1 = time.sleep(2) # 延迟2秒 print(time.clock()) #上次调用clock之后的间隔 # 2.00014532747535
元组形式 struct_time
UTC coordinated universal time 世界标准时间，
格林威治时间Greenwich Mean Time(GMT),中国UTC-8
DST daylight saving time 夏令时
import time print(time.gmtime()) # 本初子午线时间，格林威治时间 """ time.struct_time(tm_year=2018, tm_mon=1, tm_mday=7, tm_hour=9, tm_min=18, tm_sec=51, tm_wday=6, tm_yday=7, tm_isdst=0) """ y = time.localtime() # 本地时间 print(y) """ time.struct_time(tm_year=2018, tm_mon=1, tm_mday=7, tm_hour=17, tm_min=18, tm_sec=51, tm_wday=6, tm_yday=7, tm_isdst=0) """
字符串形式
import time
z = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) # 格式化时间
print(z) # 2018-01-07 16:07:47转换
print(time.asctime(time.localtime())) # 将元组转为字符串
# Sun Jan 7 17:23:55 2018
print(time.ctime(time.time())) # 将时间戳转为字符串
# Sun Jan 7 17:24:24 2018
print(time.mktime(time.localtime())) # 将元组转为时间戳
# 1515317184.0
print(time.strptime(z, "%Y-%m-%d %H:%M:%S")) # 将字符串转为元组
"""
time.struct_time(tm_year=2018, tm_mon=1, tm_mday=7,
tm_hour=17, tm_min=28, tm_sec=26,
tm_wday=6, tm_yday=7, tm_isdst=-1)
"""
datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
"""
<type 'datetime.datetime'> 2018-04-20 11:11:52.007203
<type 'str'> 2018-04-20
"""时间的加减
import datetime print(datetime.datetime.now()) # 2018-01-07 17:53:23.579155 print(datetime.datetime.now()+datetime.timedelta(3)) # 默认为天 # 2018-01-10 17:53:23.579155 print(datetime.datetime.now()+datetime.timedelta(hours=3)) # 2018-01-07 20:53:23.579155
help(time)
The tuple items are: year (including century, e.g. 1998) month (1-12) day (1-31) hours (0-23) minutes (0-59) seconds (0-59) weekday (0-6, Monday is 0) Julian day (day in the year, 1-366) DST (Daylight Savings Time) flag (-1, 0 or 1) Functions: time() -- return current time in seconds since the Epoch as a float clock() -- return CPU time since process start as a float sleep() -- delay for a number of seconds given as a float gmtime() -- convert seconds since Epoch to UTC tuple localtime() -- convert seconds since Epoch to local time tuple asctime() -- convert time tuple to string ctime() -- convert time in seconds to string mktime() -- convert local time tuple to seconds since Epoch strftime() -- convert time tuple to string according to format specification strptime() -- parse string to time tuple according to format specification tzset() -- change the local timezone Commonly used format codes: %Y Year with century as a decimal number. %m Month as a decimal number [01,12]. %d Day of the month as a decimal number [01,31]. %H Hour (24-hour clock) as a decimal number [00,23]. %M Minute as a decimal number [00,59]. %S Second as a decimal number [00,61]. %z Time zone offset from UTC. %a Locale's abbreviated weekday name. %A Locale's full weekday name. %b Locale's abbreviated month name. %B Locale's full month name. %c Locale's appropriate date and time representation. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale's equivalent of either AM or PM. Other codes may be available on your platform. See documentation for the C library strftime function.
