Hacerse - to seem
Is that true that hacerse can be used to mean 'to seem'?
Eg: El día se hacía muy larga. The day seemed very long.

7 Answers
Actually, it seems to follow from the use of hacer as an intransitive verb meaning "to play, to act as, to act as if" (or am I completely tonto??) And that racoon is really down because garden season is almost over and there will be no more blueberries, raspberries, squash, tomatoes or peaches to plunder in my garden! 
Yeah, with hacerse meaning to pretend or be like, like you can pretend to be a clown etc... with hacerse, (to seem like)
El día se hacía muy largo
but I have heard
El día se hizo muy largo
and I couldn't tell you the difference between them.
Hot off the presses, some of this thread seems to address your question:
Otros usos de hacer:
11 . tr. Dar un determinado aspecto. Esa camisa te hace más joven. U. t. c. intr.
22 . tr. Creer o suponer. ¿Tú aquí? Yo te hacía en Madrid.
27 . tr. fingir (? simular). Hace QUE estudia.
35 . impers. Expresa la cualidad o estado del tiempo atmosférico. Hace calor.
36 . impers. Haber transcurrido cierto tiempo. Hace tres días que no la veo.
43 . intr. aparentar (? manifestar, dar a entender lo que no es). Haz como que no lo has visto.
55 . prnl. Dicho de una cosa: Parecerle otra a alguien. El día se me hizo una eternidad.
Lector makes a good observation:
Hacerse el tonto: to play the fool
Hecerse el que no oye: to pretend one can't hear
Hacerse el loco: to pretend one does not notice that one is being addressed.
I just found this in our dictionary under 'hacer'
10. to cause to look o seem (dar aspecto a)
este espejo te hace gordo -> that mirror makes you look o seem fat
And here's some more confirmation : Mirriam Webster Dictionary - to seem 4