Convert time units, calculate date differences, and add/subtract durations
Date Calculator
Start Date & Time
End Date & Time
0Years
0Months
0Days
8Hours
0Minutes
0Seconds
Total: 0 days / 8 hours / 480 minutes | Working days: 1
Unit to Seconds
| Unit | Seconds |
|---|---|
| 1 minute | 60 s |
| 1 hour | 3,600 s |
| 1 day | 86,400 s |
| 1 week | 604,800 s |
| 1 month (avg) | 2,629,746 s |
| 1 year (avg) | 31,556,952 s |
Days and Hours
| Unit | Days / Hours |
|---|---|
| 1 week | 7 d / 168 h |
| 1 fortnight | 14 d / 336 h |
| 1 month (avg) | 30.44 d / 730.5 h |
| 1 quarter (avg) | 91.31 d / 2,191.5 h |
| 1 year (avg) | 365.25 d / 8,766 h |
| 1 leap year | 366 d / 8,784 h |
Common Duration References
Work day8 h / 480 min
Work week40 h / 2,400 min
Work year~260 days / 2,080 h
Fortnight14 days / 2 weeks
Quarter~13 weeks / 91.3 days
Decade10 years / ~3,652.5 days
One million seconds~11.57 days
One billion seconds~31.7 years
Quick Tips
Leap Years
Leap years occur every 4 years (except centuries, unless divisible by 400). This adds 1 day to February.
Unix Timestamp
Unix time counts seconds since Jan 1, 1970 UTC. Current time is roughly 1.7+ billion seconds.
Working Days
A standard work year has ~260 working days (52 weeks x 5 days), not counting holidays.
Month Lengths
30 days: Apr, Jun, Sep, Nov. 31 days: Jan, Mar, May, Jul, Aug, Oct, Dec. Feb: 28/29 days.