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   "cell_type": "markdown",
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   "source": [
    "Numpy date utilites\n",
    "===================\n",
    "\n",
    "This library provides utility functions to perform conversions and get\n",
    "information about numpy dates quickly."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import datetime\n",
    "import random\n",
    "import numpy\n",
    "import pyinterp\n",
    "\n",
    "def make_date(samples=10000):\n",
    "    \"\"\"Generates random dates.\"\"\"\n",
    "    epoch = datetime.datetime(1970, 1, 1)\n",
    "    delta = datetime.datetime.now() - datetime.datetime(1970, 1, 1)\n",
    "\n",
    "    pydates = [epoch + random.random() * delta for _ in range(samples)]\n",
    "    npdates = numpy.array(pydates).astype(\"datetime64[ns]\")\n",
    "\n",
    "    return npdates"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "dates = make_date()\n",
    "dates"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the date part as a structured numpy array of three fields: `year`,\n",
    "`month` and `day`:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.date(dates)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the time part as a structured numpy array of three fields: `hour`,\n",
    "`minute` and `second`:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.time(dates)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the ISO calendar of the date as a structured numpy array of three\n",
    "fields: `year`, `weekday` and `week`:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.isocalendar(dates)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the week day of the dates (Sunday is 0 ... Saturday is 6):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.weekday(dates)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the timedelta from since january"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.timedelta_since_january(dates)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Get the dates as datetime.datetime array"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pyinterp.dateutils.datetime(dates)"
   ]
  }
 ],
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