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Our Days Until / Since Calculator is a comprehensive tool designed to calculate the duration between two specific dates or determine how many days are left until a particular date. It's incredibly useful for planning, scheduling, and tracking significant events.
The Days Between Dates feature allows you to calculate the exact number of days, weeks, and months between two dates. Whether you're counting down to a vacation, project deadline, or marking the duration since an event, this calculator provides precise results to aid your planning.
The Date Calculator measures the time span between two specific dates. To use it, simply input the start and end dates in a month/day/year format. It then calculates the difference in days, weeks, and months, offering clear insight into the duration of any given period.
| Unit | Definition |
|---|---|
| Millennium | \(1,000\) years |
| Century | \(100\) years |
| Decade | \(10\) years |
| Year (average) | \(365.242\) days or \(12\) months |
| Leap year | \(366\) days or \(12\) months |
| Unit | Definition |
| millennium | 1,000 years |
| century | 100 years |
| decade | 10 years |
| year (average) | 365.242 days or 12 months |
| common year | 365 days or 12 months |
| leap year | 366 days or 12 months |
| quarter | 3 months |
| month | 28-31 days Jan., Mar., May, Jul., Aug. Oct., Dec.—31 days Apr., Jun., Sep., Nov.—30 days. Feb.—28 days for common year and 29 days for leap year |
| week | 7 days |
| day | 24 hours or 1,440 minutes or 86,400 seconds |
| hour | 60 minutes or 3,600 seconds |
| minute | 60 seconds |
| second | base unit |
| millisecond | 10-3 second |
| microsecond | 10-6 second |
| nanosecond | 10-9 second |
| picosecond | 10-12 second |
| To Convert from Unit |
Unit Symbol |
and Convert to ( s ) |
Multiply by ( s / Unit ) |
| nanosecond | ns | second | 0.000000001 |
| millisecond | ms | second | 0.001 |
| second | s | second | 1 |
| second (sidereal) | s | second | 0.99726956 |
| minute | min | second | 60 |
| minute (sidereal) | min | second | 59.83617361 |
| hour | h | second | 3600 |
| hour (sidereal) | h | second | 3590.170417 |
| day | d | second | 86400 |
| day (sidereal) | h | second | 86164.09 |
| week | wk | second | 604800 |
| month | mo | second | 2628000 |
| shake | shake | second | 0.00000001 |
| year | yr | second | 31536000 |
| year (sidereal) | yr | second | 31449892.85 |
| decade | dec | second | 315360000 |
| century | c | second | 3153600000 |
| millennium | millennium | second | 31536000000 |