Use DateTime for timestamp conversion from 'yymmddhhiiss'

[erikn69]

Closes #129

The asn1::utime() function in src/helpers/asn1.php expects a date with yymmddhhiiss format,
but date() 2nd arg expects Unix timestamp (?int) as input:
date(string $format, ?int $timestamp = null): string php.net/function.date.php

if($func == 'utime') {
    $time = $params[0]; //yymmddhhiiss
    $oldTz = date_default_timezone_get();
    date_default_timezone_set("UTC");
    $time = date("ymdHis", $time);  // <-- Expects $time to be Unix timestamp, gets yymmddhhiiss string
    date_default_timezone_set($oldTz);
    $val = bin2hex($time."Z");
}

sapp/src/helpers/CMS.php

Line 479 in 2e8a56c

asn1::utime(date("ymdHis")) //UTTC Time

sapp/src/helpers/asn1.php

Lines 233 to 236 in 2e8a56c

	$time = $params[0]; //yymmddhhiiss
	$oldTz = date_default_timezone_get();
	date_default_timezone_set("UTC");
	$time = date("ymdHis", $time);