Insert Date Time

DateTime

/**
 * The onOpen function runs automatically when the Google Docs document is
 * opened. Use it to add custom menus to Google Docs that allow the user to run
 * custom scripts. For more information, please consult the following two
 * resources.
 *
 * Extending Google Docs developer guide:
 *     https://developers.google.com/apps-script/guides/docs
 *
 * Document service reference documentation:
 *     https://developers.google.com/apps-script/reference/document/
 */
function onOpen() {
  // Add a menu with some items, some separators, and a sub-menu.
  DocumentApp.getUi().createMenu('Utilities')
      .addItem('Insert Date', 'insertAtCursor')
      .addItem('Insert Time', 'insertTimeAtCursor')
      .addItem('Insert Long Date', 'insertLDateAtCursor')
      .addItem('Insert Date and Time', 'insertDTAtCursor')
      .addItem('Insert Custom Long Date and Time', 'insertCLDTAtCursor')
      .addToUi();
  
}

/**
 * Inserts the date at the current cursor location in boldface.
 */
function insertAtCursor() {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    // Attempt to insert text at the cursor position. If insertion returns null,
    // then the cursor's containing element doesn't allow text insertions.
    var date = Utilities.formatDate(new Date(), "GMT", "yyyy-MM-dd"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"
    var element = cursor.insertText(date);
    if (element) {
      element.setBold(true);
    } else {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
  moveCursorToEnd();
}
/**
 * Inserts the time at the current cursor location in boldface.
 */
function insertTimeAtCursor() {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    // Attempt to insert text at the cursor position. If insertion returns null,
    // then the cursor's containing element doesn't allow text insertions.
    var time = Utilities.formatDate(new Date(), "GMT", "HH:mm:ss"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"
    var element = cursor.insertText(time);
    if (element) {
      element.setBold(true);
    } else {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
  moveCursorToEnd();
}
/**
 * Inserts the long date at the current cursor location in boldface.
 */
function insertLDateAtCursor() {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    // Attempt to insert text at the cursor position. If insertion returns null,
    // then the cursor's containing element doesn't allow text insertions.
    var longDate = Utilities.formatDate(new Date(), "GMT", "MMMM dd, yyyy"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"
    var element = cursor.insertText(longDate);
    if (element) {
      element.setBold(true);
    } else {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
  moveCursorToEnd();
}

/**
 * Inserts the Date and time at the current cursor location in boldface.
 */
function insertDTAtCursor() {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    // Attempt to insert text at the cursor position. If insertion returns null,
    // then the cursor's containing element doesn't allow text insertions.
    var longDateTime = Utilities.formatDate(new Date(), "GMT", "MMMM dd, yyyy HH:mm"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"
    var element = cursor.insertText(longDateTime);
    if (element) {
      element.setBold(true);
    } else {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
  moveCursorToEnd();
}

/**
 * Inserts the custom long date and time at the current cursor location in boldface.
 */
function insertCLDTAtCursor() {
  var cursor = DocumentApp.getActiveDocument().getCursor();

  if (cursor) {
    // Attempt to insert text at the cursor position. If insertion returns null,
    // then the cursor's containing element doesn't allow text insertions.
    var customLDateTime = Utilities.formatDate(new Date(), "GMT", "EEEE, MMMM dd, yyyy- HH:mm'hrs'"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"
    var element = cursor.insertText(customLDateTime);
    if (element) {
      element.setBold(true);
    } else {
      DocumentApp.getUi().alert('Cannot insert text at this cursor location.');
    }
  } else {
    DocumentApp.getUi().alert('Cannot find a cursor in the document.');
  }
  moveCursorToEnd();
}

function moveCursorToEnd() {
  //move cursor to the end
  var doc=DocumentApp.getActiveDocument();
  var txtElement=doc.getCursor().getElement();
  var txtOffset=doc.getCursor().getOffset();
  var position=doc.newPosition(txtElement, txtOffset + 1);
  doc.setCursor(position);
}

Added 'time' and 'long date' formats.
Change the timezone as per your needs from 'GMT' to your time zone abbr.

Added date AND time as a new menu item.

it seems to be glitchy when I change the time zone from EST to EDT time zone to show Daylight Savings time. Or am I missing something in the code?

Hi @pbarunsarathy could you post a snippet for date format Month-Day (ex: May 08, 2019)?

Updated code to include a custom long date and time.
And moved the cursor to the end after inserting date/time.

How do you change the time format from 24 hr to 12 hr pm or am?

How can you get daylight savings time?