Some strange behavior in obspy 1.1.0 UTCDateTime object

utcdate_weirdness.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# UTC weirdness\n",
    "\n",
    "obspy version: 1.1.0\n",
    "\n",
    "python version: 3.6.2\n",
    "\n",
    "OS: Ubuntu 16.04\n",
    "\n",
    "Installed via Anaconda"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "import obspy\n",
    "\n",
    "TIME_NAMES = ('year', 'month', 'day', 'hour', 'minute', 'second',\n",
    "              'microsecond')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "def can_serialize_with_time_params(arg):\n",
    "    \"\"\" return True if using UTC time values (year, month, day, etc.) \n",
    "    provide enough information to reconstruct the object. \"\"\"\n",
    "    utc = obspy.UTCDateTime(arg)\n",
    "    time_dict = {x: getattr(utc, x) for x in TIME_NAMES}\n",
    "    utc2 = obspy.UTCDateTime(**time_dict)\n",
    "    return utc == utc2\n",
    "\n",
    "\n",
    "def compare_utc(arg1, arg2):\n",
    "    utc1 = obspy.UTCDateTime(arg1)\n",
    "    utc2 = obspy.UTCDateTime(arg2)\n",
    "    \n",
    "    print(f'testing {arg1} against {arg2}')\n",
    "    print('-'*80)\n",
    "    print(f'UTCDateTime objects are equal: {utc1==utc2}')\n",
    "    print(f'strings are equal: {str(utc1) == str(utc2)}')\n",
    "    print(f'datetimes are equal: {utc1.datetime == utc2.datetime}')\n",
    "    print(f'microseconds equal: {utc1.microsecond == utc2.microsecond}')\n",
    "    \n",
    "    # test if object can be serialized with ymd yms ms params\n",
    "    can_serialize_arg1 = can_serialize_with_time_params(arg1)\n",
    "    can_serialize_arg2 = can_serialize_with_time_params(arg2)\n",
    "    \n",
    "    print(f'can serialize arg1: {can_serialize_arg1}')\n",
    "    print(f'can serialize arg2: {can_serialize_arg2}')\n",
    "    \n",
    "    print('\\n')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "testing 1515174511.1984465 against 1515174511.1984463\n",
      "--------------------------------------------------------------------------------\n",
      "UTCDateTime objects are equal: True\n",
      "strings are equal: False\n",
      "datetimes are equal: True\n",
      "microseconds equal: True\n",
      "can serialize arg1: False\n",
      "can serialize arg2: True\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "compare_utc(1515174511.1984465, 1515174511.1984463)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "testing 1515174511.1984465 against 1515174511.198446\n",
      "--------------------------------------------------------------------------------\n",
      "UTCDateTime objects are equal: False\n",
      "strings are equal: False\n",
      "datetimes are equal: True\n",
      "microseconds equal: True\n",
      "can serialize arg1: False\n",
      "can serialize arg2: True\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "compare_utc(1515174511.1984465, 1515174511.1984460)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "testing 1515174511.198446 against 1515174511.1984458\n",
      "--------------------------------------------------------------------------------\n",
      "UTCDateTime objects are equal: True\n",
      "strings are equal: True\n",
      "datetimes are equal: False\n",
      "microseconds equal: False\n",
      "can serialize arg1: True\n",
      "can serialize arg2: False\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "compare_utc(1515174511.1984460, 1515174511.1984458)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "testing 1515174511.1984463 against 1515174511.1984458\n",
      "--------------------------------------------------------------------------------\n",
      "UTCDateTime objects are equal: False\n",
      "strings are equal: True\n",
      "datetimes are equal: False\n",
      "microseconds equal: False\n",
      "can serialize arg1: True\n",
      "can serialize arg2: False\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "compare_utc(1515174511.1984463, 1515174511.1984459)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "testing 0.1984465 against 0.1984463\n",
      "--------------------------------------------------------------------------------\n",
      "UTCDateTime objects are equal: True\n",
      "strings are equal: True\n",
      "datetimes are equal: True\n",
      "microseconds equal: True\n",
      "can serialize arg1: True\n",
      "can serialize arg2: True\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "compare_utc(.1984465, .1984463)"
   ]
  }
 ],
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