Timestamp no more uses site timezone

I will add a patch for this momentarily.

Here's a patch to get the timestamp from local time instead of GMT.

The patch passes when tested with the correct test (the default test for this module is set to unsupported PHP version for Drupal 8).

The module is using php function "gmdate" which always results in greenwich time. According to php manual, "Identical to the date() function except that the time returned is Greenwich Mean Time (GMT)."

The only change needed to get the timestamp to run on local time is:

- $name .= '-' . gmdate($this->confGet('timestamp_format'));
+ $name .= '-' . date($this->confGet('timestamp_format'));

In other words, change gmdate() to date(). That's it.

(It also works)

Committed. Thanks.