Greetings, Vutdoan, generally, both 'in' and 'during' go with 'mid', but the former is more often when the time period is relatively narrow. 'During', on the other hand, occurs where a broader time span is meant. The following are examples from Macmillan English Dictionary: in mid-September; during the mid-1950s <also note that no apostrophe is needed after the number> Respectfully, Gleb Chebrikoff
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