datetime chapter added

Author: sijantech

.ipynb_checkpoints/18. Datetime-checkpoint.ipynb

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18. Datetime.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 1. Datetime Module\n",
+    " - Manipulation date objects\n",
+    " \n",
+    "```\n",
+    " \n",
+    " datetime.datetime : date object with date and time\n",
+    " \n",
+    " datetime.timedelta : difference between dates or datetimes\n",
+    " \n",
+    " datetime.timezone : timezone adjustments\n",
+    "\n",
+    " ```"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2017\n",
+      "11\n",
+      "1\n",
+      "0\n"
+     ]
+    }
+   ],
+   "source": [
+    "import datetime\n",
+    "\n",
+    "# current date and time object\n",
+    "now = datetime.datetime.now()\n",
+    "\n",
+    "print(now.year)\n",
+    "print(now.hour)\n",
+    "print(now.minute)\n",
+    "# Return the day of the week as an integer, where Monday is 0 and Sunday is 6.\n",
+    "print(now.weekday())"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 2. Date object to string\n",
+    "\n",
+    "  - http://strftime.org/"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'2018-11-10 17:53:59'"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "dt_obj = datetime.datetime(2018, 11, 10, 17, 53, 59)\n",
+    "date_str = dt_obj.strftime(\"%Y-%m-%d %H:%M:%S\")\n",
+    "date_str"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 3. String to Datetime object"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "datetime.datetime(2008, 11, 10, 17, 53, 59)"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "date_str = \"2008-11-10 17:53:59\"\n",
+    "dt_obj = datetime.datetime.strptime(date_str, \"%Y-%m-%d %H:%M:%S\")\n",
+    "dt_obj"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 4. Timestamp to Datetime object"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "datetime.datetime(2008, 11, 12, 21, 59, 27, 595983)"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# timestamp to datetime object in UTC\n",
+    "timestamp = 1226527167.595983\n",
+    "dt_obj = datetime.datetime.utcfromtimestamp(timestamp)\n",
+    "dt_obj"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 5. Difference between two Dates"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "end_date = datetime.datetime.now()\n",
+    "start_date = end_date - datetime.timedelta(days=8)\n",
+    "difference_in_days = abs((end_date - start_date).days)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "8"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "difference_in_days"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### TRY YOURSELF\n",
+    "\n",
+    " 1) WAP to convert a string to datetime.\n",
+    " \n",
+    "        Example input : Jan 1 2014 2:43PM \n",
+    "                Output : 2014-07-01 14:43:00"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
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+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
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+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
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