Ayer fue martes*.
(*in spanish, days and months are not capitalized)
on Tuesday = el martes (el MAHR-tehs)
Llovió ayer
It means What day was yesterday?
Tuesday = martes
It means "yesterday was".
Martes
on Tuesday = el martes (el MAHR-tehs)
classes on Tuesday = clases el martes
Llovió ayer
tuesday
Well, I can show you how to say it in Spanish, since I don’t speak Thai. Yesterday: Ayer.
Le encontré ayer
Hoy es martes.
Today If this is Wednesday, then on Tuesday, Wednesday was 'tomorrow', and on Thursday it will be 'yesterday'.
"Tuve que trabajar ayer."
If the day after the day before yesterday was Tuesday, then yesterday was Tuesday, making today Wednesday. Given that the day before the day after tomorrow is Thursday, it confirms that today is indeed Wednesday. Therefore, today is Wednesday.
The original question is in Spanish and means "What was the date yesterday?" For me, here and now it's Tuesday Sep 18th (1.15am at my end already) so yesterday was Monday September 17th