Notebook

Dates and Times¶

Basics
strftime
strptime
timedelta

Basics¶

In [4]:

fromdatetimeimportdatetime,date,time

In [5]:

year=2017month=8day=29hour=18minute=4second=15

In [6]:

dt=datetime(year,month,day,hour,minute,second)

In [7]:

dt.hour,dt.minute,dt.second

Out[7]:

(18, 4, 15)

Extract the equivalent date object:

In [8]:

dt.date()

Out[8]:

datetime.date(2017, 8, 29)

Extract the equivalent time object:

In [9]:

dt.time()

Out[9]:

datetime.time(18, 4, 15)

When aggregating or grouping time series data, it is sometimes useful to replace fields of a series of datetimes such as zeroing out the minute and second fields:

In [10]:

dt.replace(minute=0,second=0)

Out[10]:

datetime.datetime(2017, 8, 29, 18, 0)

strftime¶

Format a datetime string:

In [11]:

dt.strftime('%m/%d/%Y %H:%M')

Out[11]:

'08/29/2017 18:04'

strptime¶

Convert a string into a datetime object:

In [13]:

datetime.strptime('20170829','%Y%m%d')

Out[13]:

datetime.datetime(2017, 8, 29, 0, 0)

timedelta¶

Get the current datetime:

In [14]:

dt_now=datetime.now()

Subtract two datetime fields to create a timedelta:

In [15]:

delta=dt_now-dtdelta

Out[15]:

datetime.timedelta(0, 8, 836993)

Add a datetime and a timedelta to get a new datetime:

In [16]:

dt+delta

Out[16]:

datetime.datetime(2017, 8, 29, 18, 4, 23, 836993)

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