If you’ve spent any time playing with code and dates, you will at some point have come across the date the 1st January 1970.
In fact, even if you’ve never touched any code, you’ll have probably come across it. I came across it today when I was looking at the stats on WordPress:
Bizarrely, the WordPress hit counter starts in 1970. Not so bizarrely, no one read my blog that day. But then they were probably all so excited by Charles “Chub” Feeney becoming president of baseball’s National League. Or something.
Most likely, this is caused by the Unix Timestamp, a number I wrote about the other day. As I said, time is a real faff, but numbers are great, so computers sometimes store time as numbers. Specifically, the number of seconds since midnight on the 1st January 1970. It’s a real oddity when you first encounter it, but it makes a lot of sense.
It’s not, though, the only way of storing time. Microsoft, typically, do it a different way, and use a value that’s affectionately known as Integer8, which is an even bigger number. This is the number of nanosecond intervals since midnight on January 1st, 1601.
With both of these, you need to do a calculation along the lines of:
January 1st 1970 + number of seconds
To turn the number into a date. Of course, this means that if you report the Timestamp as 0, the computer adds 0 to January 1st 1970, and gets January 1st, 1970.
Presumably, it’s something along these lines that have resulted in WordPress reporting me hit stats from 1970. According to computers, a lot of things happened on 1st January 1970.