Yesterday Google has released a new free course on developing Android apps with Kotlin. Check it out on Udacity:

Here's a link on Twitter

I'm confused with such using of Past Perfect, i.e. I always thought that It's not allowed to use Present Perfect with some time makers like 'yesterday', 'last week', 'two days ago', as Google did it.

Maybe the clue is in the second sentence, which is connected to the result of the first one?

Can somebody explain the idea?

closed as off-topic by James K, Michael Harvey, Eddie Kal, shin, Andrew Nov 14 '18 at 17:27

  • This question does not appear to be about learning the English language within the scope defined in the help center.
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  • 3
    Tweets, like conversations, are often ungrammatical. – Jason Bassford Nov 12 '18 at 18:51
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    I don't know who this Kotlin is, but you know people make mistakes all the time. No one is perfect. – Mari-Lou A Nov 12 '18 at 18:52
  • Kotlin is a programming language – samaryan Nov 12 '18 at 20:39
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    It's a mistake because the tweeter or person quoted doesn't know English well. I,personally, have never heard an English speaker make that particular mistake. Yesterday + PP is a red flag for non-native speech. – Lambie Nov 12 '18 at 21:28
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    I'm upvoting (+1) but voting to close this question as off-topic because there is a consensus that this is an error, not an example of correct English. – James K Nov 12 '18 at 21:37