I had a great New Year's with friends in New York City, but again, a 'date' worth researching. Irregular lengths of months, days coordinated with the sun, but not weeks. All very strange, IMHO. Check out the Gregorian Calendar Wikipedia page. One point of pride coming from one gallerina I'd met in Tehran, was the organic and seemingly superior calendar system of Iran. Nowruz (there are a bazillion ways to spell it) is the Iranian version of Christmas/New Years (family time and celebrations). This Iranian New Year begins on the spring equinox, the day the sun is directly over the equator. From wikipedia:
"an astronomical solar calendar and one of the longest chronological records in history and is currently used in Iran and Afghanistan as the main official calendar. Beginning each year on the vernal equinox as precisely determined by astronomical observations from Tehran (or the 52.5°E meridian, which also defines IRST), this makes it more accurate than the Gregorian Calendar in being synchronized with the solar year, but harder to work out when a particular date would occur before the New Year preceding that date.
Iran even initiated a calendar reform (a tweak) in 1925! I can't even imagine the Western powers considering this.
So, interestingly enough, in regards to calendars and a sense of date and time, we are two different cultures with two different concepts of timekeeping.