From 67db1c6e9bc474c34cb10029794b64be8c85a393 Mon Sep 17 00:00:00 2001
From: Hilmar R <u02@u29lx193>
Date: Sat, 23 Jan 2021 15:24:24 +0100
Subject: melt diff prod fork 4.6.2 air onto 5.2.1 to 5.2.2 DB 1241

---
 include/datetime.php | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'include/datetime.php')

diff --git a/include/datetime.php b/include/datetime.php
index ef0927ea4..0b8722b4f 100644
--- a/include/datetime.php
+++ b/include/datetime.php
@@ -534,3 +534,35 @@ function update_birthdays() {
 		}
 	}
 }
+
+/**
+ *
+ * Calculate a due by interval
+ * based on the current datetime the interval is added/subtracted
+ * @author Hilmar Runge
+ * @since  2020-02-20
+ * @param  $duri the interval in the format n[n]i
+ *		   where n is a 1-2 digit numeric amount and i is a unit
+ *         example $duri='1w' represents one week
+ *         unit may be one of i(minutes), h(hours), d(days), w(weeks), m(months, y(years))
+ * @return array['due']  computed datetime in format 'Y-m-d H:i:s'
+ * 				['durn'] the amount
+ *				['duru'] the unit
+ *		   or false
+ */
+	function calculate_adue($duri=false, $sign='+') {
+		if ( preg_match( '/^[0-9]{1,2}[ihdwmy]{1}$/', $duri ) && ($sign == '+' || $sign == '-')  ) {
+			$duru = substr( $duri, -1);
+			$durn = substr( $duri, 0, -1);
+			$due  = date( 'Y-m-d H:i:s', strtotime(
+					'+' . $durn . ' ' 
+				  . str_replace( array(':i',':h',':d',':w',':m',':y'), 
+			 				 	 array('minutes', 'hours', 'days', 'weeks', 'months', 'years'),
+			 					 ( ':'. $duru ) 
+			 					) 
+					)
+			);
+			return array( 'durn' => $durn, 'duru' => $duru, 'due' => $due);
+		}
+		return false;
+	}
-- 
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