Off the top of my head the Egyptians are the earliest people I know of who used a 365 day year. I believe the Romans did, too - certainly they did after the reforms of Julius Caesar (the Julian calendar is very close to the standard used in Europe and America - we use a reformed version called the Gregorian calendar after the Pope who instituted it).
The Jewish calendar even now does not use 365 days for a single year but it does feature a corrective measure - "intercalary days" added to the calendar every few years, so that the year never gets too far out of synchronisation with the solar year. So the
average length of a year is still 365 days. Other lunar calendars (like the ancient Sumerian calendar or the modern Muslim calendar) usually do the same sort of thing.
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