#!/usr/bin/env python
# coding: utf-8

# # Dates and Times

# * Basics
# * strftime
# * strptime
# * timedelta

# ## Basics

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from datetime import datetime, date, time


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


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


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dt.hour, dt.minute, dt.second


# Extract the equivalent date object:

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dt.date()


# Extract the equivalent time object:

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dt.time()


# 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:

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


# ## strftime

# Format a datetime string:

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


# ## strptime

# Convert a string into a datetime object:

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


# ## timedelta

# Get the current datetime:

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dt_now = datetime.now()


# Subtract two datetime fields to create a timedelta:

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delta = dt_now - dt
delta


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

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dt + delta


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