The current top 2 formats are, from some checks I've done, 2 dominant formats used in Hugo projects.

Checking these first has a big effect:

```bash

name                  old time/op    new time/op    delta
CommonTimeLayouts-10    1.45µs ± 0%    0.33µs ± 1%  -77.45%  (p=0.029 n=4+4)

name                  old alloc/op   new alloc/op   delta
CommonTimeLayouts-10    1.55kB ± 0%    0.18kB ± 0%  -88.14%  (p=0.029 n=4+4)

name                  old allocs/op  new allocs/op  delta
CommonTimeLayouts-10      38.0 ± 0%       6.0 ± 0%  -84.21%  (p=0.029 n=4+4)
```

See gohugoio/hugo#10942