Issue #16767 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: DONE to 2.5: REQUIRED, 2.6: DONE, 2.7: DONE

backported into ruby_2_6 at r67915

----------------------------------------
Bug #16767: Time#strftime not working correctly with a big precision on recurred formats like "%c"
https://bugs.ruby-lang.org/issues/16767#change-91288

* Author: dmikurube (Dai MIKURUBE)
* Status: Closed
* Priority: Normal
* ruby -v: 2.7.0
* Backport: 2.5: REQUIRED, 2.6: DONE, 2.7: DONE
----------------------------------------
Confirmed on: Ruby 2.6.3 and 2.7.0 on Mac OS X 10.13.

```ruby
Time .now .strftime("%28c")
```

Expected:
```
"    Tue Apr  7 12:44:16 2020"
```

Actual:
```
"    \u0000ue Apr  7 12:44:16 2020"
```

Appendix:
* For `"%c"`, 26 worked, but 27+ did not work.
* Confirmed similar for other recurred formats like `"%R"`, `"%F"`, and else.




-- 
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