diff --git a/htdocs/comm/action/class/actioncomm.class.php b/htdocs/comm/action/class/actioncomm.class.php
index 86011980c80..f7ceea4743d 100644
--- a/htdocs/comm/action/class/actioncomm.class.php
+++ b/htdocs/comm/action/class/actioncomm.class.php
@@ -28,7 +28,6 @@
  */
 require_once DOL_DOCUMENT_ROOT.'/comm/action/class/cactioncomm.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
-require_once DOL_DOCUMENT_ROOT.'/core/class/html.formmail.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/CMailFile.class.php';
 require_once DOL_DOCUMENT_ROOT.'/comm/action/class/actioncommreminder.class.php';
 
@@ -2299,6 +2298,7 @@ class ActionComm extends CommonObject
 		$resql = $this->db->query($sql);
 
 		if ($resql) {
+			require_once DOL_DOCUMENT_ROOT.'/core/class/html.formmail.class.php';
 			$formmail = new FormMail($this->db);
 
 			while ($obj = $this->db->fetch_object($resql)) {
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 7e0a8ff63b4..b949877dc82 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -4891,6 +4891,164 @@ class Facture extends CommonInvoice
 			return -2;
 		}
 	}
+
+
+	/**
+	 *  Send reminders by emails for ivoices that are due
+	 *  CAN BE A CRON TASK
+	 *
+	 *  @param	int			$nbdays			Delay after due date (or before if delay is negative)
+	 *  @param	string		$paymentmode	'' or 'all' by default (no filter), or 'LIQ', 'CHQ', CB', ...
+	 *  @param	int|string	$template		Name (or id) of email template (Must be a template of type 'facture_send')
+	 *  @return int         				0 if OK, <>0 if KO (this function is used also by cron so only 0 is OK)
+	 */
+	public function sendEmailsReminderOnDueDate($nbdays = 0, $paymentmode = 'all', $template = '')
+	{
+		global $conf, $langs, $user;
+
+		$error = 0;
+		$this->output = '';
+		$this->error = '';
+		$nbMailSend = 0;
+		$errorsMsg = array();
+
+		if (empty($conf->facture->enabled)) {	// Should not happen. If module disabled, cron job should not be visible.
+			$langs->load("bills");
+			$this->output = $langs->trans('ModuleNotEnabled', $langs->transnoentitiesnoconv("Facture"));
+			return 0;
+		}
+		/*if (empty($conf->global->FACTURE_REMINDER_EMAIL)) {
+			$langs->load("bills");
+			$this->output = $langs->trans('EventRemindersByEmailNotEnabled', $langs->transnoentitiesnoconv("Facture"));
+			return 0;
+		}
+		*/
+
+		require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+		require_once DOL_DOCUMENT_ROOT.'/core/class/html.formmail.class.php';
+		$formmail = new FormMail($this->db);
+
+		$now = dol_now();
+		$tmpinvoice = new Facture($this->db);
+
+		dol_syslog(__METHOD__, LOG_DEBUG);
+
+		$this->db->begin();
+
+		//Select all action comm reminder
+		$sql = "SELECT rowid as id FROM ".MAIN_DB_PREFIX."facture as f";
+		if (!empty($paymentmode) && $paymentmode != 'all') {
+			$sql .= ", ".MAIN_DB_PREFIX."c_paiement as cp";
+		}
+		$sql .= " WHERE f.paye = 0";
+		$sql .= " AND f.date_lim_reglement = '".$this->db->idate(dol_get_first_hour(dol_time_plus_duree(dol_now(), -1 * $nbdays, 'd'), 'gmt'), 'gmt')."'";
+		$sql .= " AND f.entity IN (".getEntity('facture').")";
+		if (!empty($paymentmode) && $paymentmode != 'all') {
+			$sql .= " AND f.fk_mode_reglement = cp.id AND cp.code = '".$this->db->escape($paymentmode)."'";
+		}
+		// TODO Add filter to check there is no payment started
+		$sql .= $this->db->order("date_lim_reglement", "ASC");
+		$resql = $this->db->query($sql);
+
+		if ($resql) {
+			while ($obj = $this->db->fetch_object($resql)) {
+				if (!$error) {
+					// Load event
+					$res = $tmpinvoice->fetch($obj->id);
+					if ($res > 0) {
+						$tmpinvoice->fetch_thirdparty();
+
+						$outputlangs = new Translate('', $conf);
+						if ($tmpinvoice->thirdparty->default_lang) {
+							$outputlangs->setDefaultLang($tmpinvoice->thirdparty->default_lang);
+						} else {
+							$outputlangs = $langs;
+						}
+
+						// Select email template
+						$arraymessage = $formmail->getEMailTemplate($this->db, 'facture_send', $user, $outputlangs, (is_numeric($template) ? $template : 0), 1, (is_numeric($template) ? '' : $template));
+						if (is_numeric($arraymessage) && $arraymessage <= 0) {
+							$langs->load("bills");
+							$this->output = $langs->trans('FailedToFindEmailTemplate', $template);
+							return 0;
+						}
+
+						// PREPARE EMAIL
+						$errormesg = '';
+
+						// Make substitution in email content
+						$substitutionarray = getCommonSubstitutionArray($langs, 0, '', $this);
+
+						complete_substitutions_array($substitutionarray, $langs, $this);
+
+						// Content
+						$sendContent = make_substitutions($langs->trans($arraymessage->content), $substitutionarray);
+
+						//Topic
+						$sendTopic = (!empty($arraymessage->topic)) ? $arraymessage->topic : html_entity_decode($langs->trans('EventReminder'));
+
+						// Recipient
+						$res = $tmpinvoice->fetch_thirdparty();
+						$recipient = $tmpinvoice->thirdparty;
+						if ($res > 0) {
+							if (!empty($recipient->email)) {
+								$to = $recipient->email;
+							} else {
+								$errormesg = "Failed to send remind to thirdparty id=".$tmpinvoice->fk_soc.". No email defined for user.";
+								$error++;
+							}
+						} else {
+							$errormesg = "Failed to load recipient with thirdparty id=".$tmpinvoice->fk_soc;
+							$error++;
+						}
+
+						// Sender
+						$from = $conf->global->MAIN_MAIL_EMAIL_FROM;
+						if (empty($from)) {
+							$errormesg = "Failed to get sender into global setup MAIN_MAIL_EMAIL_FROM";
+							$error++;
+						}
+
+						if (!$error) {
+							// Errors Recipient
+							$errors_to = $conf->global->MAIN_MAIL_ERRORS_TO;
+
+							$trackid = 'inv'.$tmpinvoice->id;
+							// Mail Creation
+							$cMailFile = new CMailFile($sendTopic, $to, $from, $sendContent, array(), array(), array(), '', "", 0, 1, $errors_to, '', $trackid, '', '', '');
+
+							// Sending Mail
+							if ($cMailFile->sendfile()) {
+								$nbMailSend++;
+							} else {
+								$errormesg = $cMailFile->error.' : '.$to;
+								$error++;
+							}
+						}
+
+						if ($errormesg) {
+							$errorsMsg[] = $errormesg;
+						}
+					} else {
+						$errorsMsg[] = 'Failed to fetch record invoice with ID = '.$obj->id;
+						$error++;
+					}
+				}
+			}
+		} else {
+			$error++;
+		}
+
+		if (!$error) {
+			$this->output = 'Nb of emails sent : '.$nbMailSend;
+			$this->db->commit();
+			return 0;
+		} else {
+			$this->db->commit(); // We commit also on error, to have the error message recorded.
+			$this->error = 'Nb of emails sent : '.$nbMailSend.', '.(!empty($errorsMsg)) ? join(', ', $errorsMsg) : $error;
+			return $error;
+		}
+	}
 }
 
 /**
@@ -5604,153 +5762,4 @@ class FactureLigne extends CommonInvoiceLine
 			}
 		}
 	}
-
-
-	/**
-	 *  Send reminders by emails for ivoices that are due
-	 *  CAN BE A CRON TASK
-	 *
-	 *  @param	int			$nbdays			Delay after due date (or before if delay is negative)
-	 *  @param	string		$paymentmode	'' or 'all' by default (no filter), or 'LIQ', 'CHQ', CB', ...
-	 *  @param	int|string	$idtemplate		Id or name of of email template (Must be a template of type 'invoice')
-	 *  @return int         				0 if OK, <>0 if KO (this function is used also by cron so only 0 is OK)
-	 */
-	public function sendEmailsReminderOnDueDate($nbdays = 0, $paymentmode = 'all', $idtemplate = '')
-	{
-		global $conf, $langs, $user;
-
-		$error = 0;
-		$this->output = '';
-		$this->error = '';
-		$nbMailSend = 0;
-		$errorsMsg = array();
-
-		if (empty($conf->facture->enabled)) {	// Should not happen. If module disabled, cron job should not be visible.
-			$langs->load("bills");
-			$this->output = $langs->trans('ModuleNotEnabled', $langs->transnoentitiesnoconv("Facture"));
-			return 0;
-		}
-		if (empty($conf->global->FACTURE_REMINDER_EMAIL)) {
-			$langs->load("bills");
-			$this->output = $langs->trans('EventRemindersByEmailNotEnabled', $langs->transnoentitiesnoconv("Facture"));
-			return 0;
-		}
-
-		$formmail = new FormMail($this->db);
-
-		// Select email template
-		$arraymessagetemplate = $formmail->getEMailTemplate($this->db, 'facture', $user, $langs, $idtemplate, 1);
-		if (is_numeric($arraymessagetemplate) && $arraymessagetemplate <= 0) {
-			$langs->load("bills");
-			$this->output = $langs->trans('FailedToFindEmailTemplate', $idtemplate);
-			return 0;
-		}
-
-		$now = dol_now();
-		$tmpinvoice = new Facture($this->db);
-
-		dol_syslog(__METHOD__, LOG_DEBUG);
-
-		$this->db->begin();
-
-		//Select all action comm reminder
-		$sql = "SELECT rowid as id FROM ".MAIN_DB_PREFIX."facture as f";
-		if (!empty($paymentmode) && $paymentmode != 'all') {
-			$sql .= ", ".MAIN_DB_PREFIX."c_paiement as cp";
-		}
-		$sql .= " WHERE f.paye = 0";
-		$sql .= " AND f.date_lim_reglement = '".$this->db->idate(dol_time_plus_duree($now, -1 * $nbdays, 'd'))."'";	// TODO Remove hours into filter
-		$sql .= " AND f.entity IN (".getEntity('facture').")";
-		if (!empty($paymentmode) && $paymentmode != 'all') {
-			$sql .= " AND f.fk_mode_reglement = cp.id AND cp.code = '".$this->db->escape($paymentmode)."'";
-		}
-		// TODO Add filter to check there is no payment started
-		$sql .= $this->db->order("date_lim_reglement", "ASC");
-		$resql = $this->db->query($sql);
-
-		if ($resql) {
-			while ($obj = $this->db->fetch_object($resql)) {
-				if (!$error) {
-					//Select email template
-					$arraymessage = $arraymessagetemplate;
-
-					// Load event
-					$res = $tmpinvoice->fetch($obj->id);
-					if ($res > 0) {
-						// PREPARE EMAIL
-						$errormesg = '';
-
-						// Make substitution in email content
-						$substitutionarray = getCommonSubstitutionArray($langs, 0, '', $this);
-
-						complete_substitutions_array($substitutionarray, $langs, $this);
-
-						// Content
-						$sendContent = make_substitutions($langs->trans($arraymessage->content), $substitutionarray);
-
-						//Topic
-						$sendTopic = (!empty($arraymessage->topic)) ? $arraymessage->topic : html_entity_decode($langs->trans('EventReminder'));
-
-						// Recipient
-						$res = $tmpinvoice->fetch_thirdparty();
-						$recipient = $tmpinvoice->thirdparty;
-						if ($res > 0) {
-							if (!empty($recipient->email)) {
-								$to = $recipient->email;
-							} else {
-								$errormesg = "Failed to send remind to thirdparty id=".$tmpinvoice->fk_soc.". No email defined for user.";
-								$error++;
-							}
-						} else {
-							$errormesg = "Failed to load recipient with thirdparty id=".$tmpinvoice->fk_soc;
-							$error++;
-						}
-
-						// Sender
-						$from = $conf->global->MAIN_MAIL_EMAIL_FROM;
-						if (empty($from)) {
-							$errormesg = "Failed to get sender into global setup MAIN_MAIL_EMAIL_FROM";
-							$error++;
-						}
-
-						if (!$error) {
-							// Errors Recipient
-							$errors_to = $conf->global->MAIN_MAIL_ERRORS_TO;
-
-							$trackid = 'inv'.$tmpinvoice->id;
-							// Mail Creation
-							$cMailFile = new CMailFile($sendTopic, $to, $from, $sendContent, array(), array(), array(), '', "", 0, 1, $errors_to, '', $trackid, '', '', '');
-
-							// Sending Mail
-							if ($cMailFile->sendfile()) {
-								$nbMailSend++;
-							} else {
-								$errormesg = $cMailFile->error.' : '.$to;
-								$error++;
-							}
-						}
-
-						if ($errormesg) {
-							$errorsMsg[] = $errormesg;
-						}
-					} else {
-						$errorsMsg[] = 'Failed to fetch record invoice with ID = '.$obj->id;
-						$error++;
-					}
-				}
-			}
-		} else {
-			$error++;
-		}
-
-		if (!$error) {
-			$this->output = 'Nb of emails sent : '.$nbMailSend;
-			$this->db->commit();
-			return 0;
-		} else {
-			$this->db->commit(); // We commit also on error, to have the error message recorded.
-			$this->error = 'Nb of emails sent : '.$nbMailSend.', '.(!empty($errorsMsg)) ? join(', ', $errorsMsg) : $error;
-			return $error;
-		}
-	}
 }
diff --git a/htdocs/core/lib/date.lib.php b/htdocs/core/lib/date.lib.php
index a615c04ca8e..0dde3a93159 100644
--- a/htdocs/core/lib/date.lib.php
+++ b/htdocs/core/lib/date.lib.php
@@ -547,12 +547,12 @@ function dol_get_last_day($year, $month = 12, $gm = false)
  *
  *	@param		int			$date		Date GMT
  * 	@param		mixed		$gm			False or 0 or 'tzserver' = Return date to compare with server TZ,
- * 										True or 1 or 'gmt' to compare with GMT date.
+ * 										'gmt' to compare with GMT date.
  *  @return		int						Date for last hour of a given date
  */
 function dol_get_last_hour($date, $gm = 'tzserver')
 {
-	$tmparray = dol_getdate($date);
+	$tmparray = dol_getdate($date, false, ($gm == 'gmt' ? 'gmt' : ''));
 	return dol_mktime(23, 59, 59, $tmparray['mon'], $tmparray['mday'], $tmparray['year'], $gm);
 }
 
@@ -561,12 +561,12 @@ function dol_get_last_hour($date, $gm = 'tzserver')
  *
  *	@param		int			$date		Date GMT
  * 	@param		mixed		$gm			False or 0 or 'tzserver' = Return date to compare with server TZ,
- * 										True or 1 or 'gmt' to compare with GMT date.
+ * 										'gmt' to compare with GMT date.
  *  @return		int						Date for last hour of a given date
  */
 function dol_get_first_hour($date, $gm = 'tzserver')
 {
-	$tmparray = dol_getdate($date);
+	$tmparray = dol_getdate($date, false, ($gm == 'gmt' ? 'gmt' : ''));
 	return dol_mktime(0, 0, 0, $tmparray['mon'], $tmparray['mday'], $tmparray['year'], $gm);
 }
 
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index ce3b89d7805..80681032dfc 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -2290,7 +2290,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
 		dol_print_error("Functions.lib::dol_print_date function called with a bad value from page ".$_SERVER["PHP_SELF"]);
 		return '';
 	} elseif (preg_match('/^([0-9]+)\-([0-9]+)\-([0-9]+) ?([0-9]+)?:?([0-9]+)?:?([0-9]+)?/i', $time, $reg)) {    // Still available to solve problems in extrafields of type date
-		// This part of code should not be used.
+		// This part of code should not be used anymore.
 		dol_syslog("Functions.lib::dol_print_date function called with a bad value from page ".$_SERVER["PHP_SELF"], LOG_WARNING);
 		//if (function_exists('debug_print_backtrace')) debug_print_backtrace();
 		// Date has format 'YYYY-MM-DD' or 'YYYY-MM-DD HH:MM:SS'
@@ -2318,7 +2318,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
 		$timetouse = $time + $offsettz + $offsetdst; // TODO Replace this with function Date PHP. We also should not use anymore offsettz and offsetdst but only offsettzstring.
 
 		// Here ret is string in PHP setup language (strftime was used). Now we convert to $outputlangs.
-		$month = adodb_strftime('%m', $timetouse);
+		$month = adodb_strftime('%m', $timetouse, true);
 		$month = sprintf("%02d", $month); // $month may be return with format '06' on some installation and '6' on other, so we force it to '06'.
 		if ($encodetooutput) {
 			$monthtext = $outputlangs->transnoentities('Month'.$month);
@@ -2336,7 +2336,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
 	if (preg_match('/__a__/i', $format)) {
 		$timetouse = $time + $offsettz + $offsetdst; // TODO Replace this with function Date PHP. We also should not use anymore offsettz and offsetdst but only offsettzstring.
 
-		$w = adodb_strftime('%w', $timetouse); // TODO Replace this with function Date PHP. We also should not use anymore offsettz and offsetdst but only offsettzstring.
+		$w = adodb_strftime('%w', $timetouse, true); // TODO Replace this with function Date PHP. We also should not use anymore offsettz and offsetdst but only offsettzstring.
 		$dayweek = $outputlangs->transnoentitiesnoconv('Day'.$w);
 		$ret = str_replace('__A__', $dayweek, $ret);
 		$ret = str_replace('__a__', dol_substr($dayweek, 0, 3), $ret);
@@ -2353,7 +2353,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
  *
  *	@param	int			$timestamp      Timestamp
  *	@param	boolean		$fast           Fast mode. deprecated.
- *  @param	string		$forcetimezone	'' to use the PHP server timezone. Or use a form like 'Europe/Paris' or '+0200' to force timezone.
+ *  @param	string		$forcetimezone	'' to use the PHP server timezone. Or use a form like 'gmt', 'Europe/Paris' or '+0200' to force timezone.
  *	@return	array						Array of informations
  *										'seconds' => $secs,
  *										'minutes' => $min,
@@ -2375,7 +2375,7 @@ function dol_getdate($timestamp, $fast = false, $forcetimezone = '')
 		$datetimeobj = new DateTime();
 		$datetimeobj->setTimestamp($timestamp); // Use local PHP server timezone
 		if ($forcetimezone) {
-			$datetimeobj->setTimezone(new DateTimeZone($forcetimezone)); //  (add timezone relative to the date entered)
+			$datetimeobj->setTimezone(new DateTimeZone($forcetimezone == 'gmt' ? 'UTC' : $forcetimezone)); //  (add timezone relative to the date entered)
 		}
 		$arrayinfo = array(
 			'year'=>((int) date_format($datetimeobj, 'Y')),
diff --git a/htdocs/core/modules/modFacture.class.php b/htdocs/core/modules/modFacture.class.php
index 9b576e292e2..8e9d242a6e3 100644
--- a/htdocs/core/modules/modFacture.class.php
+++ b/htdocs/core/modules/modFacture.class.php
@@ -121,7 +121,7 @@ class modFacture extends DolibarrModules
 		$datestart = dol_mktime(23, 0, 0, $arraydate['mon'], $arraydate['mday'], $arraydate['year']);
 		$this->cronjobs = array(
 			0=>array('label'=>'RecurringInvoices', 'jobtype'=>'method', 'class'=>'compta/facture/class/facture-rec.class.php', 'objectname'=>'FactureRec', 'method'=>'createRecurringInvoices', 'parameters'=>'', 'comment'=>'Generate recurring invoices', 'frequency'=>1, 'unitfrequency'=>3600 * 24, 'priority'=>50, 'status'=>1, 'test'=>'$conf->facture->enabled', 'datestart'=>$datestart),
-			1=>array('label'=>'SendEmailsRemindersOnDueDate', 'jobtype'=>'method', 'class'=>'compta/facture/class/facture.class.php', 'objectname'=>'Facture', 'method'=>'sendEmailsReminderOnDueDate', 'parameters'=>"10,all,0", 'comment'=>'Send an emails when the unpaid invoices reach a due date + n days', 'frequency'=>1, 'unitfrequency'=>3600 * 24, 'priority'=>50, 'status'=>0, 'test'=>'$conf->facture->enabled', 'datestart'=>$datestart),
+			1=>array('label'=>'SendEmailsRemindersOnDueDate', 'jobtype'=>'method', 'class'=>'compta/facture/class/facture.class.php', 'objectname'=>'Facture', 'method'=>'sendEmailsReminderOnDueDate', 'parameters'=>"10,all,EmailTemplateCode", 'comment'=>'Send an emails when the unpaid invoices reach a due date + n days (an email template with EmailTemplateCode must exists. the version in the language of the thirdparty will be used in priority)', 'frequency'=>1, 'unitfrequency'=>3600 * 24, 'priority'=>50, 'status'=>0, 'test'=>'$conf->facture->enabled', 'datestart'=>$datestart),
 		);
 
 		// Permissions
diff --git a/htdocs/cron/class/cronjob.class.php b/htdocs/cron/class/cronjob.class.php
index 0b926f6a802..2af3b39789e 100644
--- a/htdocs/cron/class/cronjob.class.php
+++ b/htdocs/cron/class/cronjob.class.php
@@ -1140,9 +1140,9 @@ class Cronjob extends CommonObject
 				$ret = dol_include_once($this->classesname);
 				if ($ret === false || (!class_exists($this->objectname))) {
 					if ($ret === false) {
-						$this->error = $langs->trans('CronCannotLoadClass', $this->classesname, $this->objectname);
+						$this->error = $langs->transnoentitiesnoconv('CronCannotLoadClass', $this->classesname, $this->objectname);
 					} else {
-						$this->error = $langs->trans('CronCannotLoadObject', $this->classesname, $this->objectname);
+						$this->error = $langs->transnoentitiesnoconv('CronCannotLoadObject', $this->classesname, $this->objectname);
 					}
 					dol_syslog(get_class($this)."::run_jobs ".$this->error, LOG_ERR);
 					$this->lastoutput = $this->error;
@@ -1155,7 +1155,7 @@ class Cronjob extends CommonObject
 			// test if method exists
 			if (!$error) {
 				if (!method_exists($this->objectname, $this->methodename)) {
-					$this->error = $langs->trans('CronMethodDoesNotExists', $this->objectname, $this->methodename);
+					$this->error = $langs->transnoentitiesnoconv('CronMethodDoesNotExists', $this->objectname, $this->methodename);
 					dol_syslog(get_class($this)."::run_jobs ".$this->error, LOG_ERR);
 					$this->lastoutput = $this->error;
 					$this->lastresult = -1;
@@ -1163,7 +1163,7 @@ class Cronjob extends CommonObject
 					$error++;
 				}
 				if (in_array(strtolower(trim($this->methodename)), array('executecli'))) {
-					$this->error = $langs->trans('CronMethodNotAllowed', $this->methodename, $this->objectname);
+					$this->error = $langs->transnoentitiesnoconv('CronMethodNotAllowed', $this->methodename, $this->objectname);
 					dol_syslog(get_class($this)."::run_jobs ".$this->error, LOG_ERR);
 					$this->lastoutput = $this->error;
 					$this->lastresult = -1;
diff --git a/test/phpunit/DateLibTest.php b/test/phpunit/DateLibTest.php
index 03eacd13745..78f5b36da49 100644
--- a/test/phpunit/DateLibTest.php
+++ b/test/phpunit/DateLibTest.php
@@ -36,6 +36,10 @@ if (empty($user->id)) {
 }
 $conf->global->MAIN_DISABLE_ALL_MAILS=1;
 
+print "\n".$langs->trans("CurrentTimeZone").' : '.getServerTimeZoneString();
+print "\n".$langs->trans("CurrentHour").' : '.dol_print_date(dol_now('gmt'), 'dayhour', 'tzserver');
+print "\n";
+
 
 /**
  * Class for PHPUnit tests
@@ -72,9 +76,6 @@ class DateLibTest extends PHPUnit\Framework\TestCase
 
 		print __METHOD__." db->type=".$db->type." user->id=".$user->id;
 
-		print "\n".$langs->trans("CurrentTimeZone").' : '.getServerTimeZoneString();
-		print "\n".$langs->trans("CurrentHour").' : '.dol_print_date(dol_now('gmt'), 'dayhour', 'tzserver');
-
 		//print " - db ".$db->db;
 		print "\n";
 	}
@@ -490,5 +491,30 @@ class DateLibTest extends PHPUnit\Framework\TestCase
 		$conf->global->MAIN_START_WEEK = 0;	// start on sunday
 		$prev = dol_get_first_day_week($day, $month, $year);
 		$this->assertEquals(1, (int) $prev['first_day']);		// sunday for month 2, year 2015 is the 1st
+
+		return 1;
+	}
+
+
+	/**
+	 * testDolGetFirstHour
+	 *
+	 * @return int
+	 */
+	public function testDolGetFirstHour()
+	{
+		global $conf;
+
+		$now = 1800 + (24 * 3600 * 10);	// The 11th of january 1970 at 0:30 in UTC
+		$result = dol_get_first_hour($now, 'gmt');
+		print __METHOD__." now = ".$now.", dol_print_date(now, 'dayhourrfc', 'gmt') = ".dol_print_date($now, 'dayhourrfc', 'gmt').", result = ".$result.", dol_print_date(result, 'dayhourrfc', 'gmt') = ".dol_print_date($result, 'dayhourrfc', 'gmt')."\n";
+		$this->assertEquals('1970-01-11T00:00:00Z', dol_print_date($result, 'dayhourrfc', 'gmt'));		// monday for month 2, year 2014 is the 2
+
+		$now = 23.5 * 3600 + (24 * 3600 * 10);	// The 11th of january 1970 at 23:30 in UTC
+		$result = dol_get_first_hour($now, 'gmt');
+		print __METHOD__." now = ".$now.", dol_print_date(now, 'dayhourrfc', 'gmt') = ".dol_print_date($now, 'dayhourrfc', 'gmt').", result = ".$result.", dol_print_date(result, 'dayhourrfc', 'gmt') = ".dol_print_date($result, 'dayhourrfc', 'gmt')."\n";
+		$this->assertEquals('1970-01-11T00:00:00Z', dol_print_date($result, 'dayhourrfc', 'gmt'));		// monday for month 2, year 2014 is the 2
+
+		return 1;
 	}
 }