GanttSheet can use different calendars, and you can configure the settings of each. Try changing the options in the demo below to configure the calendar.

Built-in Calendars There are 3 built-in calendars that can be applied to a GanttSheet: standard (8:00 to 17:00, Monday to Friday) hours24(24 hours a day, seven days a week) nightShift (starts at 11:00 p.m. on Monday and ends at 4:00 a.m. on Saturday, from 11:00 p.m. to 8:00 a.m. the next day) Calendar Settings Calendar Settings define some properties mainly for calculation duration. Week Start - The first day of the week, the default value is Sunday. Default Start/End Time - Daily work start/end time, default start time is 8:00 am and end time is 5:00 pm. Hours per day - The length of hours in a work day, the default value is 8 hours. Hours per week - The length of the work week, the default value is 40 hours. Days per month - The length of the work month, the default value is 20 days. Duration Unit - The unit of measurement for working hours, the default is days. Default duration decimal digits - The Time precision reserved for calculation, default length is 3.
/*REPLACE_MARKER*/ /*DO NOT DELETE THESE COMMENTS*/ var myTable; var ganttSheet; window.onload = function() { var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), { sheetCount: 0 }); initSpread(spread); initSplitView(spread); }; function initSpread(spread) { spread.suspendPaint(); initDataSource(spread); initGanttSheet(spread); spread.resumePaint(); } function initDataSource(spread) { var tableName = "Gantt_Id"; var baseApiUrl = getBaseApiUrl(); var apiUrl = baseApiUrl + "/" + tableName; var dataManager = spread.dataManager(); myTable = dataManager.addTable("myTable", { batch: true, remote: { read: { url: apiUrl } }, schema: { hierarchy: { type: "Parent", column: "parentId" }, columns: { id: { isPrimaryKey: true }, taskNumber: { dataType: "rowOrder" } } } }); } function initGanttSheet(spread) { ganttSheet = spread.addSheetTab(0, "GanttSheet", GC.Spread.Sheets.SheetType.ganttSheet); var view = myTable.addView("ganttView", [ { value: "taskNumber", caption: "NO.", width: 60 }, { value: "name", caption: "Task Name", width: 200 }, { value: "duration", caption: "Duration", width: 90 }, { value: "predecessors", caption: "Predecessors", width: 120, visible: false } ]); view.fetch().then(function() { ganttSheet.bindGanttView(view); }); initSidePanel(ganttSheet); } function initSidePanel(ganttSheet) { var currentCalendarItem = document.getElementById("current-calendar"); var startDayItem = document.getElementById("start-day"); var defaultStartTimeItem = document.getElementById("default-start-time"); var defaultFinishTimeItem = document.getElementById("default-finish-time"); var hoursPerDayItem = document.getElementById("hours-per-day"); var hoursPerWeekItem = document.getElementById("hours-per-week"); var daysPerMonthItem = document.getElementById("days-per-month"); var durationUnitItem = document.getElementById("duration-unit"); var decimalDigitsItem = document.getElementById("decimal-digits"); var updateSettingsItem = document.getElementById("update-settings"); currentCalendarItem.addEventListener("change", function() { var calendarType = currentCalendarItem.value; var calendar = GC.Spread.Sheets.GanttSheet.Calendar[calendarType]; ganttSheet.project.calendar = calendar; }); updateSettingsItem.addEventListener("click", function() { var startDay = Number(startDayItem.value); var defaultStartTime = defaultStartTimeItem.value; var defaultFinishTime = defaultFinishTimeItem.value; var hoursPerDay = Number(hoursPerDayItem.value); var hoursPerWeek = Number(hoursPerWeekItem.value); var daysPerMonth = Number(daysPerMonthItem.value); var durationUnit = durationUnitItem.value; var decimalDigits = Number(decimalDigitsItem.value); var project = ganttSheet.project; ganttSheet.suspendPaint(); project.suspendSchedule(); project.calendarSettings.weekStartOn = startDay; var startTime = defaultStartTime.split(":"); project.calendarSettings.defaultStartTime = { hour: Number(startTime[0]), minute: Number(startTime[1]) }; var finishTime = defaultFinishTime.split(":"); project.calendarSettings.defaultFinishTime = { hour: Number(finishTime[0]), minute: Number(finishTime[1]) }; project.calendarSettings.hoursPerDay = hoursPerDay; project.calendarSettings.hoursPerWeek = hoursPerWeek; project.calendarSettings.daysPerMonth = daysPerMonth; project.calendarSettings.defaultDurationUnit = durationUnit; project.calendarSettings.defaultDurationDecimalDigits = decimalDigits; project.resumeSchedule(); ganttSheet.resumePaint(); }); } function getBaseApiUrl() { return window.location.href.match(/http.+spreadjs\/demos\//)[0] + 'server/api'; } function initSplitView(spread) { var host = document.getElementById("split-view"); var content = host.getElementsByClassName("split-content")[0]; var panel = host.getElementsByClassName("split-panel")[0]; new SplitView({ host: host, content: content, panel: panel, refreshContent: function() { spread.refresh(); } }); }
<!doctype html> <html style="height:100%;font-size:14px;"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="stylesheet" type="text/css" href="$DEMOROOT$/en/purejs/node_modules/@mescius/spread-sheets/styles/gc.spread.sheets.excel2013white.css"> <link rel="stylesheet" type="text/css" href="$DEMOROOT$/spread/source/splitView/splitView.css"> <!-- Promise Polyfill for IE, https://www.npmjs.com/package/promise-polyfill --> <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> <script src="$DEMOROOT$/en/purejs/node_modules/@mescius/spread-sheets/dist/gc.spread.sheets.all.min.js" type="text/javascript"></script> <script src="$DEMOROOT$/en/purejs/node_modules/@mescius/spread-sheets-tablesheet/dist/gc.spread.sheets.tablesheet.min.js" type="text/javascript"></script> <script src="$DEMOROOT$/en/purejs/node_modules/@mescius/spread-sheets-ganttsheet/dist/gc.spread.sheets.ganttsheet.min.js" type="text/javascript"></script> <script src="$DEMOROOT$/spread/source/splitView/splitView.js" type="text/javascript"></script> <script src="$DEMOROOT$/spread/source/js/license.js" type="text/javascript"></script> <script src="app.js" type="text/javascript"></script> <link rel="stylesheet" type="text/css" href="styles.css"> </head> <body> <div id="split-view" class="sample-tutorial"> <div id="ss" class="sample-spreadsheets split-content"></div> <div class="options-container split-panel"> <div class="option-block"> <div class="option-row option-title"> Config the calendar. </div> <div class="option-row selection-box"> <label for="current-calendar">Current Calendar</label> <select id="current-calendar"> <option value="standard" selected="selected">Standard</option> <option value="hours24">24 Hours</option> <option value="nightShift">Night Shift</option> </select> </div> </div> <div class="option-block"> <div class="option-row selection-box"> <label for="start-day">Week Starts On</label> <select id="start-day"> <option value="0" selected="selected">Sunday</option> <option value="1">Monday</option> <option value="2">Tuesday</option> <option value="3">Wednesday</option> <option value="4">Thursday</option> <option value="5">Friday</option> <option value="6">Saturday</option> </select> </div> <div class="option-row input-box"> <label for="default-start-time">Default Start Time</label> <input type="text" id="default-start-time" value="8:00" /> <div class="option-info valid">* valid value: 24HR, format 8:00</div> </div> <div class="option-row input-box"> <label for="default-finish-time">Default Finish Time</label> <input type="text" id="default-finish-time" value="17:00" /> <div class="option-info valid">* valid value: 24HR, format 17:00</div> </div> <div class="option-row input-box"> <label for="hours-per-day">Hours Per Day</label> <input type="text" id="hours-per-day" value="8" /> <div class="option-info valid">* valid value: number</div> </div> <div class="option-row input-box"> <label for="hours-per-week">Hours Per Week</label> <input type="text" id="hours-per-week" value="40" /> <div class="option-info valid">* valid value: number</div> </div> <div class="option-row input-box"> <label for="days-per-month">Days Per Month</label> <input type="text" id="days-per-month" value="20" /> <div class="option-info valid">* valid value: number</div> </div> <div class="option-row selection-box"> <label for="duration-unit">Duration Unit</label> <select id="duration-unit"> <option value="Month">Month</option> <option value="Week">Week</option> <option value="Day" selected>Day</option> <option value="Hour">Hour</option> <option value="Minute">Minute</option> </select> </div> <div class="option-row input-box"> <label for="decimal-digits">Duration Decimal Digits</label> <input type="text" id="decimal-digits" value="3" /> <div class="option-info valid">* valid value: number</div> </div> <div class="option-row"> <input type="button" id="update-settings" class="option-button" value="Update Settings" /> </div> </div> </div> </div> </html>
.option-block { background: #fff; padding: 8px; margin: 12px 0; border-radius: 4px; border: 1px dashed #82bc00; box-shadow: 0px 0 6px 0 rgba(0,0,0,0.1); } .option-block.toggle { border: 1px dotted #f7a711; } .option-row { font-size: 14px; box-sizing: border-box; padding: 4px 0; } .option-title { font-weight: bold; color: #656565; } .option-info { font-size: 12px; color: #919191; margin-top: 6px; font-weight: normal; } .option-info.valid { color: #82bc00; } .option-info.toggle { color: #f7a711; } .option-button { width: 100%; padding: 0; line-height: 20px; background: #82bc00; color: #fff; transition: 0.3s; cursor: pointer; outline: none; border-radius: 4px; box-sizing: border-box; box-shadow: 0 1px 4px 0 rgba(0,0,0,0.3); border: none; } .option-button:hover { background: #82bc00; color: #fff; box-shadow: 0 3px 8px 0 rgba(0,0,0,0.4); } .option-checkbox { background: #fff; border: 1px dashed #f7a711; color: #f7a711; padding: 2px 4px; transition: 0.3s; box-sizing: border-box; cursor: pointer; } .option-checkbox.active { color: #fff; background: #f7a711; box-shadow: 0 1px 4px 0 rgba(0,0,0,0.3); border-radius: 4px; } .selection-box { position: relative; } .selection-box > select { text-align: left; width: 100%; height: 20px; padding: 0; line-height: 20px; background: transparent; border: none; border-bottom: 2px solid #656565; color: #656565; transition: 0.3s; cursor: pointer; outline: none; box-sizing: border-box; } .selection-box > select > option { background: white; } .selection-box > select:focus { border-bottom: 2px solid #82bc00; color: #82bc00; box-shadow: 0 2px 6px 0 rgba(0,0,0,0.3); } .selection-box > label { position: absolute; cursor: pointer; font-size: 12px; color: #fff; background: #656565; padding: 0 4px; right: 0; top: 6px; box-shadow: 0 1px 4px 0 rgba(0,0,0,0.3); } .input-box { position: relative; } .input-box > input[type=text] { width: 100%; background: transparent; border: none; color: #656565; border-bottom: 2px solid #656565; outline: none; box-sizing: border-box; transition: 0.3s; } .input-box > input[type=text]:focus { color: #82bc00; border-bottom: 2px solid #82bc00; } .input-box > label { cursor: pointer; position: absolute; right: 0; top: 5px; font-size: 12px; color: #fff; background: #656565; padding: 0 4px; box-shadow: 0 1px 4px 0 rgba(0,0,0,0.3); }