How to remove datePublished A value for publisher field is required during structured data blog post testing. When you’re writing to compete for google first page, always bear in mind of post errors. This blog post errors (blog posting) can only be detected through structured data test.
The best way is to test your URL is by using Google Structure Data Tool. If your bog pass this test tool without errors like mine, then your post is rich to google snippet, first page, good for crawling
How to fix datePublished A value for publisher field is required.
1. Login to blogger.
2. Go to blog Setting.
3. Select Language and formatting.
4. Select and edit Timestamp Format.
5. Change all the date setting according to picture below.
6. After changing all the date setting, format and time zone.
Then ensure you look upper right and save your configuration.
Check and see that datePublished A value for publisher field is required error in google structure data is gone.
See other SDTT schema markup errors solutions
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How to remove the headline is recommended, please provide a value if available