Python common time, datetime processing

There are three forms of time in Python:

float,

struct tuple (Time.struct_time or Datetime.datetime),

Str

Commonly used for:

float -to- struct tuple: time. localtime (float)

struct Time tuple --and str: Time. strftime (format, struct time tuple)

Str -- struct time tuple: time. Strptime (str, format)

struct Time tuple --- float : time. Mktime (struct time tuple)

struct Time tuple -- datetime: datetime (*time_tuple[0:6])

float -- datetime: Datetime.datetime. Fromtimestamp (float)

datetime-to-str: datetime. Strftime(format, datetime)

Str -- datetime: datetime.strptime(str, format)

datetime -to- struct time tuple: DateTime. Timetuple ()

Note:

Time is based on float, the decimal point is milliseconds, and the integer part is the second. (Java is milliseconds, so python_time*1000 = = Java_time)

DateTime is an int, omitting the millisecond part. DateTime tuple less than struct_time

1. Current time

>>> import time>>> time.time () 1450681042.751>>> time.localtime (Time.time ()) time.struct_ Time (tm_year=2015, tm_mon=12, tm_mday=21, tm_hour=15, tm_min=0, tm_sec=2, tm_wday=0, tm_yday=355, tm_isdst=0) >> > Time.strftime ('%y-%m-%d%h:%m:%s ', Time.localtime (Time.time ())) ' 2015-12-21 15:01:28 ' >>> from datetime Import datetime>>> DateTime.Now () datetime.datetime (+, (+), (+), $, 279000) >>> Datetime.today () Datetime.datetime () (+, +, +,-A, 204000) >>> now = DateTime.Now () >>> Now.year, Now.month, Now.day, Now.hour, Now.minute, Now.second, now.microsecond>>> Now.isocalendar () # 2015 52nd Monday (Mon, 1) >>> Now.isoweekday () # Day of the week, 1:monday; and the Now.weekday () return value starts at 0 1

2. Date string--date

>>> s= ' 2015-12-21 15:01:28 ' >>> timetuple = Datetime.strptime (S, '%y-%m-%d%h:%m:%s ') Datetime.datetime, 1, (+) >>> datetime.datetime.strftime ('%y/%m/%d%h:%m:%s ', timetuple)

>>> s= ' 2015-12-21 15:01:28 ' >>> timetuple = Datetime.strptime (S, '%y-%m-%d%h:%m:%s ') time.struct_ Time (tm_year=2015, tm_mon=12, tm_mday=21, tm_hour=15, Tm_min=1, tm_sec=28, tm_wday=0, tm_yday=355, tm_isdst=-1) > >> time.strftime ('%y/%m/%d%h:%m:%s ', timetuple)

  Time-date formatting symbols in Python:  %y Two-digit year (00-99)  %y Four-digit year represents (000-9999)%m month (01-12)  the day of the Month  (0-31)%H 24-hour hours (0-23)  %I 12-hour hours (01-12)   %M minutes (00=59)  %s seconds (00-59)    %a Local Simplified week name%a local  full week name  %b locally Simplified month name  %b Local full month name  %c Local corresponding date representation and time represents  %j year of the Day (001-366)  %p local a.m. or p.m. equivalent of the  number of weeks in the year (00-53) Sunday is the beginning of the week  %w Week (0-6), Sunday for the beginning of the week  %w Week of the Year (00-53) Monday is the beginning of the week  %x local corresponding date indicates  %x local corresponding time represents  %Z the name of the current time zone  

3. Time stamp

>>> Time.mktime (Time.strptime (S, '%y-%m-%d%h:%m:%s ')) 1450681288.0>>> int (time.time ())

# Timestamp to time of tuple in utctimestamp = 1226527167.595983time_tuple = Time.gmtime (timestamp) print repr (time_tuple)

# Timestamp to time tuple in local timetimestamp = 1226527167.595983time_tuple = Time.localtime (timestamp) print repr (time_ Tuple

2. Date addition and subtraction

Import Datetimenow = Datetime.datetime.now () # Datetime.datetime (, 6, Radix, 420000) DayOfweek = datetime.date Time.isoweekday () if DayOfweek = = 1: # Monday    last_time = Now + Datetime.timedelta (days=-3) Else:    Last_time = Now + Datetime.timedelta (Days=-1)

Ext.: http://www.cnblogs.com/snow-backup/p/5063665.html

Python common time, datetime processing