Python datetime and Calendar module common features

One, datetime module

The DateTime module defines the following classes:
Datetime.date: A class that represents a date. The commonly used attributes are year, month and day;
Datetime.time: A class that represents time. The commonly used properties are hour, minute, second, microsecond;
Datetime.datetime: Represents the date and time.
Datetime.timedelta: Represents the time interval, which is the length between two points in time.
Datetime.tzinfo: Related information about the time zone.

1,Datetime.datetime object

Show the current time and custom format

In [ten]: Str_time = Datetime.datetime.now ()

Or

In [ten]: Str_time = Datetime.datetime.today ()

In [all]: print Str_time
2014-11-17 20:02:10.112139

Display format customization:

in [+]: Print Str_time.strftime ("%y-%m-%d%h:%m")
2014-11-17 20:02

Convert a time-formatted string to a DateTime object

in [+]: a= "2014 11-17 20:02"
in [[]: Print Datetime.datetime.strptime (A, "%Y%m-%d%h:%m")
2014-11-17 20:02:00

Displays the current UTC time

in [+]: Print Datetime.datetime.utcnow ()
2014-11-17 12:26:59.612081

Convert (Unix) timestamps to datetime objects:

in [+]: A=time.time ()
in [+]: Print a
1416227538.62

in [+]: Print Datetime.datetime.fromtimestamp (a)
2014-11-17 20:32:18.619621

In []: Print Datetime.datetime.utcfromtimestamp (a)
2014-11-17 12:32:18.619621

2, Datetime.date Object

Show Current Date:

In [str_date]: = Datetime.date.today ()
In [all]: print str_date
2014-11-17

Displays the date object's month Day:

In [the]: print Str_date.year,str_date.month,str_date.day
2014 11 17

Convert (Unix) timestamps to date objects:

In []: A=time.time ()
in [+]: Print a
1416228263.01
In [98]: Print Datetime.date.fromtimestamp (a)
2014-11-17

3,datetime.time Object

The time class represents times, consisting of hours, minutes, seconds, and microseconds.

In [109]: TM = Datetime.time (23, 46, 10)
in [+]: Print Tm.hour,tm.minute,tm.second
23 46 10
In [113]: TM2 = Tm.replace (minute=01)
In [all]: print Tm2.hour,tm2.minute,tm2.second
23 1 10

4,datetime.timedelta Object

Show yesterday's date (can also be a few minutes or seconds or hours of time)

In [131]: A = Datetime.datetime.now ()
In [PPI]: print a
2014-11-17 20:57:17.170393
In [133]: Print a + Datetime.timedelta (days=-1)
2014-11-16 20:57:17.170393

In [137]: Print A + Datetime.timedelta (Days=1)
2014-11-18 20:57:17.170393

In [134]: Print a + Datetime.timedelta (hours=-1)
2014-11-17 19:57:17.170393
In [135]: Print a + Datetime.timedelta (minutes=-1)
2014-11-17 20:56:17.170393
In [136]: Print A + Datetime.timedelta (seconds=-1)
2014-11-17 20:57:16.170393

5, two Datetime.datetime object time difference calculation

Calculate the difference between seconds or days

in [+]: a = Datetime.datetime.now ()
In [181]: B = A + Datetime.timedelta (days=-2)
In [182]: c = A-B
In [183]: Print c.total_seconds ()
172800.0
In [184]: Print C.days
2

For detailed documentation, please see:

Https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior

Two, calendar module

Show a month for a few days

In [Calendar.monthrange]: Print (2014, 11)
(5, 30)

(5, 30) Explanation: 5 indicates that the first day of November 2014 is Saturday; 30 means November 2014 for a total of 30 days

Judging whether it is the year of the run

In [194]: Print Calendar.isleap (2012)
True
In [195]: Print Calendar.isleap (2014)
False

Determine the number of year between two years

In [196]: Print Calendar.leapdays (2000, 2014)
4

Display the calendar for a month:

In [206]: cal = Calendar.month (2011, 11)
In [207]: Print cal
November 2011
Mo Tu We Th Fr Sa Su
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30

For detailed documentation, please see:

Https://docs.python.org/2/library/calendar.html

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Python datetime and Calendar module common features