i'm working on a logo for a customer's brand, and she wrote out スーパーラッドデー！
but, couldn't it also be- スーパーラッドデイ！?

which one should i use? thanks for the help!
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2020-04-26T23:36:57.180
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2020-04-27T00:44:22.317
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question
grammar meaning
how do you say 'super rad day!' in japanese?
_Hi, Salem!_

> Day can be both デイ or デー. Both have the same pronunciation as the vowel
> sound e+i is often seen as a extension of the first sound. Take for example
> せんせい, it is pronounced as せんせー, but ー is not used as it is only used with
> katakana. Other examples are ゲーム、メール,etc.

* * *

Have a look yourself: [HiNative -
Question](https://hinative.com/ja/questions/4192885), [Reference Database for
Both](https://crd.ndl.go.jp/reference/modules/d3ndlcrdentry/index.php?page=ref_view&id=1000272112),
[デイ
usage](https://tatoeba.org/eng/sentences/search?query=%E3%83%87%E3%82%A4&from=jpn&to=eng),
[デー
usage](https://tatoeba.org/eng/sentences/search?query=%E3%83%87%E3%83%BC&from=jpn&to=eng).

Furthermore, there is a trend observed in [NHK Research (page
94)](https://www.nhk.or.jp/bunken/research/kotoba/pdf/20160501_2.pdf)
indicating that デイ is _often_ used in the beggining and デー at the end of a
word. I would say スーパーラッドデー, reasoning from the clues of all the sources above
and that it was your customer who sent it to you. Hope this helps!
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answer