Aside from levels of formality, is there a difference in the meaning/nuance of

> 今日・今週・今月・今年

as opposed to

> 本日・本週・本月・本年

?
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2017-05-17T23:22:39.383
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2017-05-18T05:26:35.027
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question
word-choice time formality
今(temporal counter) vs. 本(temporal counter)
I don't think there are differences in the meaning at all. The latter sounds
just a bit 堅苦しい(stiff/formal).
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2017-05-17T23:59:29.380
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2017-05-17T23:59:29.380
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answer
* 本週 does not exist in the first place. BCCWJ returned virtually zero result, and there is no dictionary entry for 本週.
  * 本月 is very rare. Most examples in BCCWJ are either from legal documents or quotes of old documents. I would say you should avoid using this term altogether unless you are a lawyer.
  * 本年 and 本日 are relatively common and sound fairly formal and stiff. They are almost exclusively found in formal greetings, announcements and such. 今年/今日 are roughly 10 times more common than 本年/本日, according to the corpus. Grammatically speaking, I think there is no difference in usage; both are used either as nouns or as standalone adverbs. See also: [What's the difference between 今日{きょう} and 本日{ほんじつ}?](https://japanese.stackexchange.com/q/6323/5010)
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2017-05-18T02:52:25.497
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2017-05-18T05:26:35.027
2017-05-18T05:26:35.027
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answer