Added IPython Notebook datetime snippets

core/datetime.ipynb

@@ -0,0 +1,270 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1a340e636d5b4cc6f1d1ccf3e28fc3911b115c4c5f3aff64816bd797610581ea"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "# Dates and Times"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from datetime import datetime, date, time"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 86
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "year = 2015\n",
+      "month = 1\n",
+      "day = 20\n",
+      "hour = 7\n",
+      "minute = 28\n",
+      "second = 15"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 87
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## datetime Basics"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "dt = datetime(year, month, day, hour, minute, second)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 88
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "dt.hour, dt.minute, dt.second"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 89,
+       "text": [
+        "(7, 28, 15)"
+       ]
+      }
+     ],
+     "prompt_number": 89
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Extract the equivalent date object\n",
+      "dt.date()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 90,
+       "text": [
+        "datetime.date(2015, 1, 20)"
+       ]
+      }
+     ],
+     "prompt_number": 90
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Extract the equivalent time object\n",
+      "dt.time()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 91,
+       "text": [
+        "datetime.time(7, 28, 15)"
+       ]
+      }
+     ],
+     "prompt_number": 91
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# When aggregating or grouping time series data, it is sometimes\n",
+      "# useful to replace fields of a series of datetimes such as zeroing\n",
+      "# out the minute and second fields.\n",
+      "dt.replace(minute=0, second=0)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 92,
+       "text": [
+        "datetime.datetime(2015, 1, 20, 7, 0)"
+       ]
+      }
+     ],
+     "prompt_number": 92
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## strftime"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Format datetime string\n",
+      "dt.strftime('%m/%d/%Y %H:%M')"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 93,
+       "text": [
+        "'01/20/2015 07:28'"
+       ]
+      }
+     ],
+     "prompt_number": 93
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## strptime"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Convert a string into a datetime object\n",
+      "datetime.strptime('20150120', '%Y%m%d')"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 94,
+       "text": [
+        "datetime.datetime(2015, 1, 20, 0, 0)"
+       ]
+      }
+     ],
+     "prompt_number": 94
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## timedelta"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Get the current datetime\n",
+      "dt_now = datetime.now()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 95
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Subtracting two datetimes results in a timedelta\n",
+      "delta = dt_now - dt\n",
+      "delta"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 96,
+       "text": [
+        "datetime.timedelta(4, 20866, 858576)"
+       ]
+      }
+     ],
+     "prompt_number": 96
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Adding a datetime and a timedelta results in a datetime\n",
+      "dt + delta"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 97,
+       "text": [
+        "datetime.datetime(2015, 1, 24, 13, 16, 1, 858576)"
+       ]
+      }
+     ],
+     "prompt_number": 97
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}