Actually that changes all the time! To get a general idea, you can count the number of whole days missing, and multiply that by 86,400. That's the number of seconds per day. To get more precision, you can add:
* The number of extra hours (not included in the day count) multiplied by 24
* The number of extra minutes (not included in the hour count) multiplied by 60
You could add the seconds, too, but that's not very practical; while you do the calculation, the number of seconds has already changed. A spreadsheet such as Excel might help.
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2678400 seconds
There are 60 seconds in a minute 60 minutes in an hour = 3,600 seconds 24 hours in a day = 86,400 seconds 31 days in January = 2,678,400 seconds
The number of seconds since 21 January has changed since I started calculating, Drat, I will just have to ... Oh no, its changed again. Also, I need to get information on all the leap-seconds that have been added.
Answer: 2.8 seconds has 2.8 seconds.
900,000 seconds = 900,000 seconds.