Updated: 10/17/2017 by Computer Hope

secondA second may refer to any of the following:

1. When referring to time, a second or sec is a very brief moment of time that is equal to one sixtieth (1/60) of a minute.

Many systems keep the time and date using a one second epoch. Below is a break down of how many seconds are in all of the different time periods.

Time period Epoch second equivalent
1 minute 60
1 hour 3600
1 day 86400
1 week 604800
2 weeks 1209600
3 weeks 1814400
1 month 2419200
6 months 14515200
1 year 29030400
1 decade 290304000

2. When referring to a number, second is after first; number two.

3. When referring to a version or a release, second refers to the release after the initial release of a product.

Measurements, Microsecond, Millisecond, Nanosecond