に（は）あたらない (ni-ataranai): Not worth; no need to
～に（は）あたらない (ni-ataranai)
Meaning
Not worth; no need to
Formation and usage
V dictionary + に（は）当たらない
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Judges something insufficient to warrant surprise, blame, or concern.
Examples
会議が延期されても、驚くには当たらない。
It would be no cause for surprise if the meeting were postponed.
試験が延期されても、驚くには当たらない。
It would be no cause for surprise if the exam were postponed.
研修が延期されても、驚くには当たらない。
It would be no cause for surprise if the training session were postponed.
発表会が延期されても、驚くには当たらない。
It would be no cause for surprise if the presentation event were postponed.
面接が延期されても、驚くには当たらない。
It would be no cause for surprise if the interview were postponed.
How related patterns differ
ことはない, までもない, and には及ばない can mean unnecessary, though には及ばない also means no match for. に当たらない judges a reaction unwarranted. ても差し支えない grants permission; に越したことはない recommends the best option.