1 files changed, 104 insertions, 0 deletions
diff --git a/app/Libraries/Zeitumstellung.php b/app/Libraries/Zeitumstellung.php
new file mode 100644
index 0000000..17daa08
--- /dev/null
+++ b/app/Libraries/Zeitumstellung.php
@@ -0,0 +1,104 @@
+<?php
+namespace App\Libraries;
+use App\Libraries\Zeitumstellung;
+
+use Carbon\Carbon;
+
+class Zeitumstellung {
+
+	// full date of the next time change
+	public $date;
+	public $dateText;
+	// number of days since last time change
+	public $daysago;
+	// number of days until next time change. if zero, time change is today!
+	public $daysuntil;
+
+	public $description;
+	public $descriptionHTML;
+
+	public $day;
+	public $month;
+	public $monthText;
+	public $year;
+	
+	public $now;
+
+	private $tc_march;
+	private $tc_oct;
+
+	function __construct() {
+		# debug
+		#Carbon::setTestNow( Carbon::create(2018, 10, 28, 2) );
+		#Carbon::setTestNow( Carbon::create(2020, 03, 30, 5) );
+
+		$this->now = Carbon::now()->startOfDay();
+
+		$this->year = $this->now->year;
+
+		# detect if next time change is next year
+		if ( $this->now->gt( Carbon::parse('last sunday of october')->startOfDay() ) ){
+			$this->year = $this->year+1;
+		} 
+
+		$this->tc_march = Carbon::parse('last sunday of march ' . $this->year )->startOfDay();
+		$this->tc_oct   = Carbon::parse('last sunday of october ' . $this->year)->startOfDay();
+
+		if ( $this->now->lte($this->tc_march) ){
+			# next time change is in march this year, (last sunday in october)
+
+			$this->date = $this->tc_march;
+			$this->description = 'Die Uhr wird von 2 Uhr auf 3 Uhr vorgestellt, sodass wir 1 Stunde weniger schlafen.';
+			$this->descriptionHTML = 'Die Uhr wird von 2 Uhr auf 3 Uhr vorgestellt, sodass wir <b>1 Stunde weniger</b> schlafen.';
+
+			# detect if last time change was last year
+			if ( $this->now->lt( Carbon::parse('last sunday of march ') ) ) {
+				$this->year = $this->now->year - 1;
+				$this->daysago = Carbon::parse('last sunday of october' . $this->year)->diffInDays( $this->now );
+			} else {
+				$this->daysago = $this->tc_oct->diffInDays( $this->now );
+			}
+
+		} else {
+			# next time change is in october this year, (last sunday in october)
+
+			$this->date = $this->tc_oct;
+			$this->description = 'Die Uhr wird von 3 Uhr auf 2 Uhr zurückgestellt, sodass wir 1 Stunde länger schlafen.';
+			$this->descriptionHTML = 'Die Uhr wird von 3 Uhr auf 2 Uhr zurückgestellt, sodass wir <b>1 Stunde länger</b> schlafen.';
+
+			$this->daysago = $this->tc_march->diffInDays( $this->now );
+		}
+
+		$this->dateText = $this->date->toDateString();
+
+		$this->daysuntil = $this->date->diffInDays($this->now);
+
+		$this->day = $this->date->day;
+		$this->month = $this->date->month;
+		$this->year = $this->date->year;
+
+		if ( 3 == $this->month ) {
+			$this->monthText = "März";
+		} else {
+			$this->monthText = "Oktober";
+		}
+	}
+
+	public function getData(){
+		$result = array();
+
+		$result["date"] = $this->date->toDateString();
+		$result["day"] = $this->date->day;
+		$result["month"] = $this->date->month;
+		$result["monthText"] = $this->monthText;
+		$result["year"] = $this->date->year;
+		$result["daysuntil"] = $this->daysuntil;
+		$result["daysago"] = $this->daysago;
+		$result["now"] = $this->now->toDateString();
+
+		return $result;
+	}
+	public function getJSON(){
+		return json_encode( $this->getData() );
+	}
+}