What is the philosophy of time?

Time, along with number, are the oldest measurements in the history of the Earth, unlike Imperial and Metric, they have never changed, at least, not according to the records we have kept - so as not to rule out the possibility that, beyond our recordings of history, a different unit of time was used. Every day, 60 seconds pass in a minute, 60 minutes pass in an hour, and - although this has been argued, the business on leap years does come up - 24 hours in a day, a day referring to a day and a night, not just a day. Some say this comes under the calendar, and not under the time, but days also come under weeks, weeks under months, months under years, and etc. The full scale of time measurements are the most commonly known, as with all measurements, we could go on to say, beyond a nanosecond, a picosecond or femtosecond, or yoktosecond, but there are rare usages of these, as with all units of measurements sharing these types of prefixes. Returning to the subject, time as attracted alot of philosophy in it's wake, among the measurement. Debates often arise about the credibility of time, and whether they are a penny perfectly slotted in history, or merely drawings upon the walls of existence. Time, as some argue, is a thumbnail sketch, man's way of placing upon the running days some form of progression, which eventually grew to become the known form of progression through the day. So, basically, were a time machine to ever have been built, you couldn't say "Go backwards one hour," because, an hour is just a human way of saying 'this many moments', and it would travel along the blank timeline plotted out at the start of the universe. There are no people able to make credible doubts about this philosophical theory, as, there is no man alive who can really determine if time outlines the universe, or is part of the universe.