PHP MYSQL calendar

0-PHP-CALENDAR.MD

PHP MYSQL CALENDAR

https://code-boxx.com/simple-php-calendar-events/

IMAGES

NOTES

1. Create a database and import 1-database.sql.
2. Change the database settings in 2-cal-lib.php to your own.
3. If you want "Monday first", change to mon : true in 4b-calendar.js.
4. That's all – Launch 4a-cal-page.php in your browser.

LICENSE

Copyright by Code Boxx

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

1-database.sql

CREATE TABLE `events` (
  `evt_id` bigint(20) NOT NULL,
  `evt_start` datetime NOT NULL,
  `evt_end` datetime NOT NULL,
  `evt_text` text NOT NULL,
  `evt_color` varchar(7) NOT NULL,
  `evt_bg` varchar(7) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `events`
  ADD PRIMARY KEY (`evt_id`),
  ADD KEY `evt_start` (`evt_start`),
  ADD KEY `evt_end` (`evt_end`);

ALTER TABLE `events`
  MODIFY `evt_id` bigint(20) NOT NULL AUTO_INCREMENT;

2-cal-lib.php

<?php
class Calendar {
  // (A) CONSTRUCTOR - CONNECT TO DATABASE
  private $pdo = null;
  private $stmt = null;
  public $error = "";
  function __construct () {
    $this->pdo = new PDO(
      "mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
      DB_USER, DB_PASSWORD, [
      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
    ]);
  }

  // (B) DESTRUCTOR - CLOSE DATABASE CONNECTION
  function __destruct () {
    if ($this->stmt!==null) { $this->stmt = null; }
    if ($this->pdo!==null) { $this->pdo = null; }
  }

  // (C) HELPER - RUN SQL QUERY
  function query ($sql, $data=null) : void {
    $this->stmt = $this->pdo->prepare($sql);
    $this->stmt->execute($data);
  }

  // (D) SAVE EVENT
  function save ($start, $end, $txt, $color, $bg, $id=null) {
    // (D1) START & END DATE CHECK
    if (strtotime($end) < strtotime($start)) {
      $this->error = "End date cannot be earlier than start date";
      return false;
    }

    // (D2) RUN SQL
    if ($id==null) {
      $sql = "INSERT INTO `events` (`evt_start`, `evt_end`, `evt_text`, `evt_color`, `evt_bg`) VALUES (?,?,?,?,?)";
      $data = [$start, $end, strip_tags($txt), $color, $bg];
    } else {
      $sql = "UPDATE `events` SET `evt_start`=?, `evt_end`=?, `evt_text`=?, `evt_color`=?, `evt_bg`=? WHERE `evt_id`=?";
      $data = [$start, $end, strip_tags($txt), $color, $bg, $id];
    }
    $this->query($sql, $data);
    return true;
  }

  // (E) DELETE EVENT
  function del ($id) {
    $this->query("DELETE FROM `events` WHERE `evt_id`=?", [$id]);
    return true;
  }

  // (F) GET EVENTS FOR SELECTED PERIOD
  function get ($month, $year) {
    // (F1) DATE RANGE CALCULATIONS
    $month = $month<10 ? "0$month" : $month ;
    $daysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $dateYM = "{$year}-{$month}-";
    $start = $dateYM . "01 00:00:00";
    $end = $dateYM . $daysInMonth . " 23:59:59";

    // (F2) GET EVENTS
    // s & e : start & end date
    // c & b : text & background color
    // t : event text
    $this->query("SELECT * FROM `events` WHERE (
      (`evt_start` BETWEEN ? AND ?)
      OR (`evt_end` BETWEEN ? AND ?)
      OR (`evt_start` <= ? AND `evt_end` >= ?)
    )", [$start, $end, $start, $end, $start, $end]);
    $events = [];
    while ($r = $this->stmt->fetch()) {
      $events[$r["evt_id"]] = [
        "s" => $r["evt_start"], "e" => $r["evt_end"],
        "c" => $r["evt_color"], "b" => $r["evt_bg"],
        "t" => $r["evt_text"]
      ];
    }

    // (F3) RESULTS
    return count($events)==0 ? false : $events ;
  }
}

// (G) DATABASE SETTINGS - CHANGE TO YOUR OWN!
define("DB_HOST", "localhost");
define("DB_NAME", "test");
define("DB_CHARSET", "utf8mb4");
define("DB_USER", "root");
define("DB_PASSWORD", "");

// (H) NEW CALENDAR OBJECT
$_CAL = new Calendar();

3-cal-ajax.php

<?php
if (isset($_POST["req"])) {
  // (A) LOAD LIBRARY
  require "2-cal-lib.php";
  switch ($_POST["req"]) {
    // (B) GET DATES & EVENTS FOR SELECTED PERIOD
    case "get":
      echo json_encode($_CAL->get($_POST["month"], $_POST["year"]));
      break;

    // (C) SAVE EVENT
    case "save":
      echo $_CAL->save(
        $_POST["start"], $_POST["end"], $_POST["txt"], $_POST["color"], $_POST["bg"],
        isset($_POST["id"]) ? $_POST["id"] : null
      ) ? "OK" : $_CAL->error ;
      break;

    // (D) DELETE EVENT
    case "del":
      echo $_CAL->del($_POST["id"])  ? "OK" : $_CAL->error ;
      break;
}}

4a-cal-page.php

<!DOCTYPE html>
<html>
  <head>
    <title>Calendar Demo</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.5">
    <link rel="icon" type="image/png" href="favicon.png">

    <!-- ANDROID + CHROME + APPLE + WINDOWS APP -->
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="theme-color" content="white">
    <link rel="apple-touch-icon" href="icon-512.png">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <meta name="apple-mobile-web-app-title" content="Calendar">
    <meta name="msapplication-TileImage" content="icon-512.png">
    <meta name="msapplication-TileColor" content="#ffffff">

    <!-- WEB APP MANIFEST -->
    <!-- https://web.dev/add-manifest/ -->
    <link rel="manifest" href="5-manifest.json">

    <!-- SERVICE WORKER -->
    <script>
    if ("serviceWorker" in navigator) {
      navigator.serviceWorker.register("5-worker.js");
    }
    </script>

    <!-- JS + CSS -->
    <script src="4b-calendar.js"></script>
    <link rel="stylesheet" href="4c-calendar.css">
  </head>
  <body>
    <?php
    // (A) DAYS MONTHS YEAR
    $months = [
      1 => "January", 2 => "Febuary", 3 => "March", 4 => "April",
      5 => "May", 6 => "June", 7 => "July", 8 => "August",
      9 => "September", 10 => "October", 11 => "November", 12 => "December"
    ];
    $monthNow = date("m");
    $yearNow = date("Y"); ?>

    <!-- (B) PERIOD SELECTOR -->
    <div id="calHead">
      <div id="calPeriod">
        <input id="calToday" type="button" value="&#9733;">
        <input id="calBack" type="button" class="mi" value="&lt;">
        <select id="calMonth"><?php foreach ($months as $m=>$mth) {
          printf("<option value='%u'%s>%s</option>",
            $m, $m==$monthNow?" selected":"", $mth
          );
        } ?></select>
        <input id="calYear" type="number" value="<?=$yearNow?>">
        <input id="calNext" type="button" class="mi" value="&gt;">
      </div>
      <input id="calAdd" type="button" value="+">
    </div>

    <!-- (C) CALENDAR WRAPPER -->
    <div id="calWrap">
      <div id="calDays"></div>
      <div id="calBody"></div>
    </div>

    <!-- (D) EVENT FORM -->
    <dialog id="calForm"><form method="dialog">
      <div id="evtCX">X</div>
      <h2 class="evt100">CALENDAR EVENT</h2>
      <div class="evt50">
        <label>Start</label>
        <input id="evtStart" type="datetime-local" required>
      </div>
      <div class="evt50">
        <label>End</label>
        <input id="evtEnd" type="datetime-local" required>
      </div>
      <div class="evt50">
        <label>Text Color</label>
        <input id="evtColor" type="color" value="#000000" required>
      </div>
      <div class="evt50">
        <label>Background Color</label>
        <input id="evtBG" type="color" value="#ffdbdb" required>
      </div>
      <div class="evt100">
        <label>Event</label>
        <input id="evtTxt" type="text" autocomplete="off" required>
      </div>
      <div class="evt100">
        <input type="hidden" id="evtID">
        <input type="button" id="evtDel" value="Delete">
        <input type="submit" id="evtSave" value="Save">
      </div>
    </form></dialog>
  </body>
</html>

4b-calendar.js

var cal = {
  // (A) PROPERTIES
  mon : false, // monday first
  events : null, // events data for current month/year
  sMth : 0, sYear : 0, // selected month & year
  hMth : null, hYear : null, // html month & year
  hCD : null, hCB : null, // html calendar days & body
  // html form & fields
  hFormWrap : null, hForm : null, hfID : null, 
  hfStart : null, hfEnd : null, hfTxt : null,
  hfColor : null, hfBG : null, hfDel : null,

  // (B) SUPPORT FUNCTION - AJAX FETCH
  ajax : (data, onload) => {
    // (B1) FORM DATA
    let form = new FormData();
    for (let [k,v] of Object.entries(data)) { form.append(k,v); }

    // (B2) FETCH
    fetch("3-cal-ajax.php", { method:"POST", body:form })
    .then(res => res.text())
    .then(txt => onload(txt))
    .catch(err => console.error(err));
  },

  // (C) INIT CALENDAR
  init : () => {
    // (C1) GET HTML ELEMENTS
    cal.hMth = document.getElementById("calMonth");
    cal.hYear = document.getElementById("calYear");
    cal.hCD = document.getElementById("calDays");
    cal.hCB = document.getElementById("calBody");
    cal.hFormWrap = document.getElementById("calForm");
    cal.hForm = cal.hFormWrap.querySelector("form");
    cal.hfID = document.getElementById("evtID");
    cal.hfStart = document.getElementById("evtStart");
    cal.hfEnd = document.getElementById("evtEnd");
    cal.hfTxt = document.getElementById("evtTxt");
    cal.hfColor = document.getElementById("evtColor");
    cal.hfBG = document.getElementById("evtBG");
    cal.hfDel = document.getElementById("evtDel");

    // (C2) ATTACH CONTROLS
    cal.hMth.onchange = cal.load;
    cal.hYear.onchange = cal.load;
    document.getElementById("calToday").onclick = () => cal.today();
    document.getElementById("calBack").onclick = () => cal.pshift();
    document.getElementById("calNext").onclick = () => cal.pshift(1);
    document.getElementById("calAdd").onclick = () => cal.show();
    cal.hForm.onsubmit = () => cal.save();
    document.getElementById("evtCX").onclick = () => {
      if (document.startViewTransition) { document.startViewTransition(() => cal.hFormWrap.close()); }
      else { cal.hFormWrap.close(); }
    }
    cal.hfDel.onclick = cal.del;

    // (C3) DRAW DAY NAMES
    let days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
    if (cal.mon) { days.push("Sun"); } else { days.unshift("Sun"); }
    for (let d of days) {
      let cell = document.createElement("div");
      cell.className = "calCell";
      cell.innerHTML = d;
      cal.hCD.appendChild(cell);
    }

    // (C4) LOAD & DRAW CALENDAR
    cal.load();
  },

  // (D) SHIFT CURRENT PERIOD BY 1 MONTH
  pshift : forward => {
    cal.sMth = parseInt(cal.hMth.value);
    cal.sYear = parseInt(cal.hYear.value);
    if (forward) { cal.sMth++; } else { cal.sMth--; }
    if (cal.sMth > 12) { cal.sMth = 1; cal.sYear++; }
    if (cal.sMth < 1) { cal.sMth = 12; cal.sYear--; }
    cal.hMth.value = cal.sMth;
    cal.hYear.value = cal.sYear;
    cal.load();
  },

  // (E) JUMP TO TODAY
  today : () => {
    let now = new Date(), ny = now.getFullYear(), nm = now.getMonth()+1;
    if (ny!=cal.sYear || (ny==cal.sYear && nm!=cal.sMth)) {
      cal.hMth.value = nm;
      cal.hYear.value = ny;
      cal.load();
    }
  },

  // (F) LOAD EVENTS
  load : () => {
    cal.sMth = parseInt(cal.hMth.value);
    cal.sYear = parseInt(cal.hYear.value);
    cal.ajax({
      req : "get", month : cal.sMth, year : cal.sYear
    }, events => {
      cal.events = JSON.parse(events);
      cal.draw();
    });
  },

  // (G) DRAW CALENDAR
  draw : () => {
    // (G1) CALCULATE DAY MONTH YEAR
    // note - jan is 0 & dec is 11 in js
    // note - sun is 0 & sat is 6 in js
    let daysInMth = new Date(cal.sYear, cal.sMth, 0).getDate(), // number of days in selected month
        startDay = new Date(cal.sYear, cal.sMth-1, 1).getDay(), // first day of the month
        endDay = new Date(cal.sYear, cal.sMth-1, daysInMth).getDay(), // last day of the month
        now = new Date(), // current date
        nowMth = now.getMonth()+1, // current month
        nowYear = parseInt(now.getFullYear()), // current year
        nowDay = cal.sMth==nowMth && cal.sYear==nowYear ? now.getDate() : null ;

    // (G2) DRAW CALENDAR ROWS & CELLS
    // (G2-1) INIT
    let rowA, rowB, rowC, rowMap = {}, rowNum = 1, cell, cellNum = 1,

    // (G2-2) HELPER - DRAW A NEW ROW
    rower = () => {
      rowA = document.createElement("div");
      rowB = document.createElement("div");
      rowC = document.createElement("div");
      rowA.className = "calRow";
      rowA.id = "calRow" + rowNum;
      rowB.className = "calRowHead";
      rowC.className = "calRowBack";
      cal.hCB.appendChild(rowA);
      rowA.appendChild(rowB);
      rowA.appendChild(rowC);
    },
        
    // (G2-3) HELPER - DRAW A NEW CELL
    celler = day => {
      cell = document.createElement("div");
      cell.className = "calCell";
      if (day) {
        cell.innerHTML = day;
        cell.classList.add("calCellDay");
        cell.onclick = () => {
          cal.show();
          let d = +day, m = +cal.hMth.value,
              s = `${cal.hYear.value}-${String(m<10 ? "0"+m : m)}-${String(d<10 ? "0"+d : d)}T00:00:00`;
          cal.hfStart.value = s;
          cal.hfEnd.value = s;
        };
      }
      rowB.appendChild(cell);

      cell = document.createElement("div");
      cell.className = "calCell";
      if (day===undefined) { cell.classList.add("calBlank"); }
      if (day!==undefined && day==nowDay) { cell.classList.add("calToday"); }
      rowC.appendChild(cell);
    };
    
    // (G2-4) RESET CALENDAR
    cal.hCB.innerHTML = ""; rower();

    // (G2-5) BLANK CELLS BEFORE START OF MONTH
    if (cal.mon && startDay != 1) {
      let blanks = startDay==0 ? 7 : startDay ;
      for (let i=1; i<blanks; i++) { celler(); cellNum++; }
    }
    if (!cal.mon && startDay != 0) {
      for (let i=0; i<startDay; i++) { celler(); cellNum++; }
    }

    // (G2-6) DAYS OF THE MONTH
    for (let i=1; i<=daysInMth; i++) {
      rowMap[i] = { r : rowNum, c : cellNum };
      celler(i);
      if (i!=daysInMth && cellNum%7==0) { rowNum++; rower(); }
      cellNum++;
    }

    // (G2-7) BLANK CELLS AFTER END OF MONTH
    if (cal.mon && endDay != 0) {
      let blanks = endDay==6 ? 1 : 7-endDay;
      for (let i=0; i<blanks; i++) { celler(); cellNum++; }
    }
    if (!cal.mon && endDay != 6) {
      let blanks = endDay==0 ? 6 : 6-endDay;
      for (let i=0; i<blanks; i++) { celler(); cellNum++; }
    }

    // (G3) DRAW EVENTS
    if (cal.events !== false) { for (let [id,evt] of Object.entries(cal.events)) {
      // (G3-1) EVENT START & END DAY
      let sd = new Date(evt.s), ed = new Date(evt.e);
      if (sd.getFullYear() != cal.sYear) { sd = 1; }
      else { sd = sd.getMonth()+1 < cal.sMth ? 1 : sd.getDate(); }
      if (ed.getFullYear() != cal.sYear) { ed = daysInMth; }
      else { ed = ed.getMonth()+1 > cal.sMth ? daysInMth : ed.getDate(); }

      // (G3-2) "MAP" ONTO HTML CALENDAR
      cell = {}; rowNum = 0;
      for (let i=sd; i<=ed; i++) {
        if (rowNum!=rowMap[i]["r"]) {
          cell[rowMap[i]["r"]] = { s:rowMap[i]["c"], e:0 };
          rowNum = rowMap[i]["r"];
        }
        if (cell[rowNum]) { cell[rowNum]["e"] = rowMap[i]["c"]; }
      }

      // (G3-3) DRAW HTML EVENT ROW
      for (let [r,c] of Object.entries(cell)) {
        let o = c.s - 1 - ((r-1) * 7), // event cell offset
            w = c.e - c.s + 1; // event cell width
        rowA = document.getElementById("calRow"+r);
        rowB = document.createElement("div");
        rowB.className = "calRowEvt";
        rowB.innerHTML = cal.events[id]["t"];
        rowB.style.color = cal.events[id]["c"];
        rowB.style.backgroundColor  = cal.events[id]["b"];
        rowB.classList.add("w"+w);
        if (o!=0) { rowB.classList.add("o"+o); }
        rowB.onclick = () => cal.show(id);
        rowA.appendChild(rowB);
      }
    }}
  },

  // (H) SHOW EVENT FORM
  show : id => {
    if (id) {
      cal.hfID.value = id;
      cal.hfStart.value = cal.events[id]["s"].replace(" ", "T").substring(0, 16);
      cal.hfEnd.value = cal.events[id]["e"].replace(" ", "T").substring(0, 16);
      cal.hfTxt.value = cal.events[id]["t"];
      cal.hfColor.value = cal.events[id]["c"];
      cal.hfBG.value = cal.events[id]["b"];
      cal.hfDel.style.display = "inline-block";
    } else {
      cal.hForm.reset();
      cal.hfID.value = "";
      cal.hfDel.style.display = "none";
    }
    if (document.startViewTransition) { document.startViewTransition(() => cal.hFormWrap.show()); }
    else { cal.hFormWrap.show(); }
  },

  // (I) SAVE EVENT
  save : () => {
    // (I1) COLLECT DATA
    var data = {
      req : "save",
      start : cal.hfStart.value,
      end : cal.hfEnd.value,
      txt : cal.hfTxt.value,
      color : cal.hfColor.value,
      bg : cal.hfBG.value
    };
    if (cal.hfID.value != "") { data.id = cal.hfID.value; }

    // (I2) DATE CHECK
    if (new Date(data.start) > new Date(data.end)) {
      alert("Start date cannot be later than end date!");
      return false;
    }

    // (I3) AJAX SAVE
    cal.ajax(data, res => { if (res == "OK") {
      cal.hFormWrap.close();
      cal.load();
    } else { alert(res); }});
    return false;
  },

  // (J) DELETE EVENT
  del : () => { if (confirm("Delete event?")) {
    cal.ajax({
      req : "del", id : cal.hfID.value
    }, res => { if (res == "OK") {
      cal.hFormWrap.close();
      cal.load();
    } else { alert(res); }});
  }}
};
window.onload = cal.init;

4c-calendar.css

/* (A) WHOLE PAGE */
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
body {
  position: relative;
  padding: 0; margin: 0;
  overflow-x: hidden;
}
:root {
  --bg-color-a: #3b39af; /* page header + form label */
  --bg-color-b: #404040; /* calendar header */
  --bg-color-c: #d73a3a; /* buttons */
}
@keyframes zoom-in {
  from { transform: scale(0); }
  to { transform: scale(1); }
}
@keyframes zoom-out {
  from { transform: scale(1); }
  to { transform:scale(0); }
}
::view-transition-old(zoom) { animation: .2s linear both zoom-out; }
::view-transition-new(zoom) { animation: .2s linear both zoom-in; }

/* (B) PERIOD SELECTOR */
#calHead {
  display: flex; align-items: center;
  padding: 15px;
  background: var(--bg-color-a);
}
#calPeriod { flex-grow: 1; }
#calHead input, #calHead select {
  font-size: 24px; color: #fff;
  border: 0; outline: none; background: 0;
  cursor: pointer;
}
#calMonth { margin: 0 10px; }
#calMonth option { color: #000; }
#calYear {
  width: 100px;
  margin-left: 10px;
}
#calAdd {
  padding: 5px 20px;
  background: var(--bg-color-c) !important;
}

/* (C) CALENDAR */
/* (C1) ROWS */
#calDays, .calRowHead, .calRowBack { display: flex; }
#calDays, .calRow, .calRowHead, .calRowEvt {
  position: relative;
  width: 100%;
}
.calRow { min-height: 100px; }
.calRowHead, .calRowEvt { z-index: 2; }
.calRowBack {
  position: absolute;
  top: 0; left: 0; z-index: 1;
  width: 100%; height: 100%;
}
.calRowEvt {
  padding: 3px 10px;
  margin-top: 5px;
  font-size: 12px;
  white-space: nowrap; text-overflow: ellipsis;
  overflow: hidden; cursor: pointer;
  border-radius: 10px;
}

/* (C2) CELLS & EVENTS */
.calCell { width: 14.2857%; }
.w1 { width: 14.2857%; } .w2 { width: 28.5714%; } .w3 { width: 42.8571%; }
.w4 { width: 57.1428%; } .w5 { width: 71.4285%; } .w6 { width: 85.7142%; }
.w7 { width: 100%; }
.o1 { left: 14.2857%; } .o2 { left: 28.5714%; } .o3 { left: 42.8571%; }
.o4 { left: 57.1428%; } .o5 { left: 71.4285%; } .o6 { left: 85.7142%; }
#calDays .calCell {
  color: #fff; background: var(--bg-color-b);
  font-weight: 700; text-align: center;
  padding: 15px 0;
}
.calRowHead .calCell {
  font-size: 14px;
  font-weight: 700;
  color: #b5b5b5;
  padding: 5px;
}
.calRowHead .calCellDay:hover {
  color: #ff5b5b;
  cursor: pointer;
}
.calRowBack .calCell { border: 1px solid #f5f5f5; }
.calBlank { background: #f5f5f5; }
.calToday { background: #feffd3; }

/* (D) EVENT FORM */
#calForm {
  position: absolute; top: 0; left: 0; z-index: 999;
  width: 100vw; height: 100%; min-height: 100vh;
  padding: 0; margin: 0; border: 0;
  background: rgba(0,0,0,0.5);
  view-transition-name : zoom;
}
#calForm:is([open]), #calForm form {
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: center;
}
#calForm form {
  position: relative;
  width: 450px; padding: 15px;
  border-radius: 10px;
  background: #fff;
}
#evtCX {
  position: absolute;
  top: 0; right: 0;
  padding: 10px;
  color: #b12020;
  font-size: 28px;
  font-weight: 700;
  cursor: pointer;
}
#calForm h2 { margin: 0 0 5px 0; }
#calForm .evt50 { width: 50%; }
#calForm .evt100 { width: 100%; }
#calForm .evt50, #calForm .evt100 { padding: 8px; }
#calForm label, #calForm input[type=datetime-local], #calForm input[type=color], #calForm input[type=text] {
  display: block;
  width: 100%;
}
#calForm label {
  color: #a1a1a1;
  font-size: 12px;
  margin-bottom: 5px;
}
#calForm input[type=datetime-local], #calForm input[type=text] {
  padding: 5px;
  border: 1px solid #eee;
  background: #f5f5f5;
}
#calForm input[type=color] { height: 30px; border: 0; }
#calForm input[type=button], #calForm input[type=submit] {
  border: 0; padding: 10px; margin: 10px 2px 0 0;
  color: #fff; background: var(--bg-color-c);
  cursor: pointer;
}

5-manifest.json

{
  "short_name": "Calendar",
  "name": "Calendar",
  "icons": [{
     "src": "favicon.png",
     "sizes": "64x64",
     "type": "image/png"
  }, {
    "src": "icon-512.png",
    "sizes": "512x512",
    "type": "image/png"
  }],
  "start_url": "/4a-cal-page.php",
  "scope": "/",
  "background_color": "white",
  "theme_color": "white",
  "display": "standalone"
}

5-worker.js

// (A) CREATE/INSTALL CACHE
self.addEventListener("install", evt => {
  self.skipWaiting();
  evt.waitUntil(
    caches.open("phpcal")
    .then(cache => cache.addAll([
      "4b-calendar.js",
      "4c-calendar.css",
      "5-manifest.json",
      "favicon.png",
      "icon-512.png"
    ]))
    .catch(err => console.error(err))
  );
});

// (B) CLAIM CONTROL INSTANTLY
self.addEventListener("activate", evt => self.clients.claim());

// (C) LOAD FROM CACHE FIRST, FALLBACK TO NETWORK IF NOT FOUND
self.addEventListener("fetch", evt => evt.respondWith(
  caches.match(evt.request).then(res => res || fetch(evt.request))
));

Hi
can i make simple-php-calendar-events smalles it present state is full screen.
Thanks
Hywel Franc