For quite some time I've had this little problem while proofreading translations. I don't know if I'm getting it wrong or the translators who I'm proofreading are getting it wrong:
If I have a date, let's say 1870s, ¿Does this mean the decade of the '70s or the year 1870 alone?
Same goes for, let's say the 1900s: ¿Does this mean the decade of the 1900s or the 20th century?