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fix(sitemap): use date only in <lastmod> (#94)

* make the date formate right

experiment: ACCEPT by baidu and google after modified
### Reference:
[baidu](https://ziyuan.baidu.com/college/courseinfo?id=267&page=2#h2_article_title16)
[google](https://support.google.com/webmasters/answer/183668?hl=en&ref_topic=4581190)
[sitemap](https://www.sitemaps.org/protocol.html)
[bing](https://www.bing.com/webmaster/help/how-to-submit-sitemaps-82a15bd4)
[yandex](https://yandex.ru/support/webmaster/controlling-robot/sitemap.html)

* refactor: move date formatting into a dedicated function

Co-authored-by: MDLeom <43627182+curbengh@users.noreply.github.com>

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