Do not escape characters in formatted date

[vincevriend]

Remove quotes in the template so that the '+' character will no longer needlessly be escaped as '\x2b'.
Because the + character is part of the datetime it will render an invalid date in the JSON Linked Data, which may hurt SEO.

Without this fix:

<script type="application/ld+json">
...
"dateModified": "2014-09-28T00:00:00\x2b00:00",
...
</script>

With this fix:

<script type="application/ld+json">
...
"dateModified": "2014-09-28T00:00:00+00:00",
...
</script>

[alanorth]

You're absolutely right. Even Google's Structured Data Testing Tool notices that this is malformed JSON-LD in one of my latest blog posts:

Thank you for this, @TommySprat.