Date to millisecond calculators

Date to milliseconds calculators are useful when coding cookie expiration settings for countdown timers or
if coding what ever other date-related scripts.
The calculators below are coded in javascript and help you calculate multiple date and time differences easily.
The known data:

Your computer's time:
equals milliseconds since
, ie since the start of Unix Epoch Time in your time zone ().

Convert a millisecond value to a date string

this (milli) second time number:
is the equivalent of this date string in time zone:

If needed, change Time Zone or/and click ENTER

Date to milliseconds converter

A date string examples:
"Mon Jun 18 2007 00:00:00 GMT-0400"
or "09/23/2000"
or "09/23/2000 9:45:00"



What date would that be?

Your computer's time:



equals this date:

A temporal value converted to milliseconds


equals so many (milli) seconds:

Milliseconds converted to a temporal value

So many (milli) seconds:

equals so many

How much time between now and then?

Your computer's time:

and this date:
examples:
"Mon Jun 18 2007 00:00:00 GMT-0400"
or "09/23/2000"
or "09/23/2000 9:45:00"


are different from each other

How much time between now and then (using a millisecond date value)?

Your computer's time:

and this date in (milli) seconds:

are different from each other



Date and Time Math Across Timezones


Date and Time Plus/Minus Quantity of Time

This date and time in timezone
so many
equals this date and time in this timezone

Date/Time Subtraction

This date and time in timezone
(this button is not clickable, it's always minus)
this date and time in timezone
equals so many

Last modified or updated: 30/07/2022