Fix issue processwire/processwire-issues#1288

wire/core/Page.php

@@ -725,7 +725,7 @@ class Page extends WireData implements \Countable, WireMatchable {
 			case 'modified':
 			case 'published':
 				if($value === null) $value = 0;
-				if($value && !ctype_digit("$value")) $value = strtotime($value); 
+				if($value && !ctype_digit("$value")) $value = $this->wire()->datetime->strtotime($value); 
 				$value = (int) $value; 
 				if($this->isLoaded && $this->settings[$key] !== $value) $this->trackChange($key, $this->settings[$key], $value); 
 				$this->settings[$key] = $value;

wire/core/PageFinder.php

@@ -2603,8 +2603,17 @@ class PageFinder extends Wire {
 					
 				} else if(in_array($field, array('created', 'modified', 'published'))) {
 					// prepare value for created, modified or published date fields
-					if(!ctype_digit($value)) $value = strtotime($value); 
+					if(!ctype_digit($value)) {
-					$value = date('Y-m-d H:i:s', $value); 
+						$value = $this->wire()->datetime->strtotime($value); 
+					}
+					if(empty($value)) {
+						$value = null;
+						if($operator === '>' || $operator === '=>') {
+							$value = $field === 'published' ? '1000-01-01 00:00:00' : '1970-01-01 00:00:01';
+						}
+					} else {
+						$value = date('Y-m-d H:i:s', $value);
+					}
 					
 				} else if(in_array($field, array('id', 'parent_id', 'templates_id', 'sort'))) {
 					$value = (int) $value; 
@@ -2676,10 +2685,14 @@ class PageFinder extends Wire {
 						if($operator === '=' || $operator === '!=') $operator = '&'; // bitwise
 						if($operator === '!=') $not = true;
 					}
-					if(ctype_digit("$value") && $field != 'name') $value = (int) $value;
+					if($value === null) {
-					$bindKey = $query->bindValueGetKey($value);
+						$s = "$table.$field " . ($not ? 'IS NOT NULL' : 'IS NULL'); 
-					$s = "$table.$field" . $operator . $bindKey;
+					} else {
-					if($not) $s = "NOT ($s)";
+						if(ctype_digit("$value") && $field != 'name') $value = (int) $value;
+						$bindKey = $query->bindValueGetKey($value);
+						$s = "$table.$field" . $operator . $bindKey;
+						if($not) $s = "NOT ($s)";
+					}
 				
 					if($field === 'status' && strpos($operator, '<') === 0 && $value >= Page::statusHidden && count($options['alwaysAllowIDs'])) {
 						// support the 'alwaysAllowIDs' option for specific page IDs when requested but would

wire/core/WireDateTime.php

@@ -417,6 +417,37 @@ class WireDateTime extends Wire {
 		return $value;
 	}
 
+	/**
+	 * Parse about any English textual datetime description into a Unix timestamp using PHP’s strtotime()
+	 * 
+	 * This function behaves the same as PHP’s version except that it optionally accepts an `$options` array 
+	 * and lets you specify the return value for empty or zeroed dates like 0000-00-00. If given a zerod date
+	 * then it returns null by default (rather than throwing an error as PHP8 does). 
+	 * 
+	 * @param string $str Date/time string 
+	 * @param array|int $options Options to modify behavior, or specify int for the `baseTimestamp` option. 
+	 *  - `emptyReturnValue` (int|null|false): Value to return for empty or zero-only date strings (default=null)
+	 *  - `baseTimestamp` (int|null): The timestamp which is used as a base for the calculation of relative dates.
+	 * @return false|int|null
+	 * @see https://www.php.net/manual/en/function.strtotime.php
+	 * @since 3.0.178
+	 * 
+	 */
+	function strtotime($str, $options = array()) {
+		$defaults = array(
+			'emptyReturnValue' => null, 
+			'baseTimestamp' => null,
+		);
+		if(is_int($options)) $defaults['baseTimestamp'] = $options; 
+		$options = is_array($options) ? array_merge($defaults, $options) : $defaults;
+		$str = trim($str);
+		if(empty($str)) return $options['emptyReturnValue'];
+		if(strpos($str, '00') === 0) {
+			$test = trim(preg_replace('/[^\d]/', '', $str), '0');
+			if(!strlen($test)) return $options['emptyReturnValue'];
+		}
+		return strtotime($str, $options['baseTimestamp']); 
+	}
 
 
 	/**

wire/core/WireFileTools.php

@@ -555,12 +555,12 @@ class WireFileTools extends Wire {
 	 * 
 	 * ~~~~~
 	 * $tempDir = $files->tempDir(); 
-	 * $path = $tempDir->get(); // or use $td->get();
+	 * $path = $tempDir->get(); 
 	 * file_put_contents($path . 'some-file.txt', 'Hello world'); 
 	 * ~~~~~
 	 *
 	 * @param Object|string $name Any one of the following: (default='')
-	 *  - Omit this argument for auto-generated name, 3.0.175+ 
+	 *  - Omit this argument for auto-generated name, 3.0.178+ 
 	 *  - Name/word that you specify using fieldName format, i.e. [_a-zA-Z0-9].
 	 *  - Object instance that needs the temp dir.
 	 * @param array|int $options Deprecated argument. Call `WireTempDir` methods if you need more options.

wire/modules/Inputfield/InputfieldDatetime/InputfieldDatetime.module

@@ -347,7 +347,8 @@ class InputfieldDatetime extends Inputfield {
 				$value = (int) $value;
 			} else if(strlen($value) > 8 && $value[4] === '-' && $value[7] === '-' && ctype_digit(substr($value, 0, 4))) {
 				// ISO-8601, i.e. 2010-04-08 02:48:00
-				$value = strtotime($value); 
+				$value = $this->wire()->datetime->strtotime($value); 
+				if(!$value) $value = '';
 			} else {
 				$value = $this->getInputType()->sanitizeValue($value);
 			}