Add the 'yearRange' option to the date picker, which lets you specify the range of years you want to support in the datepicker select box.

Author: ryancramerdesign

wire/modules/Inputfield/InputfieldDatetime/InputfieldDatetime.css

@@ -55,3 +55,19 @@
 #content .ui-datepicker-inline {
 	padding-bottom: 0.5em; 
 }
+
+#ui-datepicker-div {
+        /* hide the datepicker div, which shows up at the bottom of the form if not hidden */
+        /* also set default type sizes, since it displays too large otherwise */
+        font-size: 12px; 
+        line-height: 14px; 
+        display: none;
+}
+
+button.ui-datepicker-trigger {
+        /* tweak to datepicker trigger */
+        margin: 0 0 0 0.5em;
+}
+
+
+

wire/modules/Inputfield/InputfieldDatetime/InputfieldDatetime.js

@@ -11,6 +11,7 @@ jQuery(document).ready(function($) {
 		var hasTimePicker = timeFormat.length > 0 && !pickerVisible;
 		var showOn = $t.is(".InputfieldDatetimeDatepicker3") ? 'focus' : 'button';
 		var ampm = parseInt($t.attr('data-ampm')) > 0; 
+		var yearRange = $t.attr('data-yearrange'); 
 
 		if(ts > 1) tsDate = new Date(ts); 
 
@@ -36,6 +37,8 @@ jQuery(document).ready(function($) {
 			// dateFormat: config.date_format
 		}; 
 
+		if(yearRange && yearRange.length) options.yearRange = yearRange; 
+
 		if(hasTimePicker) { 
 			options.ampm = ampm; 
 			options.timeFormat = timeFormat; 

wire/modules/Inputfield/InputfieldDatetime/InputfieldDatetime.module

@@ -46,6 +46,7 @@ class InputfieldDatetime extends Inputfield {
 		$this->set('dateInputFormat', self::defaultDateInputFormat);
 		$this->set('timeInputFormat', '');
 		$this->set('datepicker', self::datepickerFocus); 
+		$this->set('yearRange', '');
 		$this->set('defaultToday', 0); 
 
 		if($this->languages) foreach($this->languages as $language) {
@@ -113,6 +114,7 @@ class InputfieldDatetime extends Inputfield {
 
 		if(strlen($timeFormatJS)) $timeFormatJS = htmlspecialchars($timeFormatJS, ENT_QUOTES, 'UTF-8'); 
 		if(empty($value)) $value = '';
+		$yearRange = htmlspecialchars($this->yearRange, ENT_QUOTES, 'UTF-8'); 
 
 		$out = 	"\n<p>" . 
 			"<input " . $this->getAttributesString($attrs) . " " . 
@@ -121,6 +123,7 @@ class InputfieldDatetime extends Inputfield {
 			"data-timeformat='$timeFormatJS' " . 
 			"data-ts='$valueTS' " . 
 			"data-ampm='$ampm' " . 
+			(strlen($yearRange) ? "data-yearrange='$yearRange' " : '') . 
 			"/></p>"; 
 
 		return $out; 
@@ -164,6 +167,16 @@ class InputfieldDatetime extends Inputfield {
 		$f->attr('value', (int) $this->datepicker); 
 		$inputfields->append($f);
 
+		$f = $this->modules->get("InputfieldText");
+		$f->attr('name', 'yearRange');
+		$f->attr('value', $this->yearRange); 
+		$f->attr('size', 10);
+		$f->label = "Date Picker Year Range";
+		$f->description = $this->_('When the date picker is used, it has a selectable year range minus and plus 10 years from the current year. To extend or reduce that, specify the quantity of years before and after [current year] in this format: "-30:+20", which would show 30 years before now and 20 years after now.'); 
+		$f->notes = $this->_('Default when no value present is "-10:+10" which shows a date picker year range 10 years before now, and 10 years after now.'); 
+		$f->collapsed = Inputfield::collapsedBlank;
+		$inputfields->append($f);
+
 		$fieldset = $this->modules->get('InputfieldFieldset'); 
 		$fieldset->label = $this->_('Date/Time Input Formats');