Days Until / Since Calculator

Result :

Days Between Dates:

Date calculator provides you the number of days between two dates. Our date duration calculator helps you find the exact difference between two dates in days, weeks, and months.

What is Date calculator?

Date duration calculator measures the exact time between two dates. To determine the number of days between two dates you need to enter the starting & ending date in month/day/year format. Click on calculate to get exact time difference between two dates in days, weeks, and months.

How to use date duration calculator?

To use the date duration calculator you need to follow below steps.


Open Date Calculator.


Enter the Start and End dates in month/date/year format.


Click on calculate to get time difference between dates in days, weeks, and months.

millennium1,000 years
century100 years
decade10 years
year (average)365.242 days or 12 months
common year365 days or 12 months
leap year366 days or 12 months
quarter3 months
month28-31 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
week7 days
day24 hours or 1,440 minutes or 86,400 seconds
hour60 minutes or 3,600 seconds
minute60 seconds
secondbase unit
millisecond10-3 second
microsecond10-6 second
nanosecond10-9 second
picosecond10-12 second

Units, symbols and conversion values used in this time calculator

To Convert from
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