There are 24 hours in a day, 60 minutes in an hour and 60 seconds in a minute. Using this information, it is possible to calculate the number of hours, minutes and seconds until a certain date. Calculating these figures requires a simple mathematical computation, and it can be used to count down to an eagerly anticipated date in the future, such as a wedding, birthday or retirement.

Determine the number of days until a certain date. Several online tools are available that will calculate the number of days between dates. Enter the start and end dates for your calculation and click the "Submit" or "Calculate" button. For example, assume that there are 150 days until a certain date.

Multiply the number of days from 24, the number of hours in a day. Continuing the same example, 150 x 24 = 3600 hours. This figure represents the number of hours until a certain date.

Multiply the hour figure by 60, the number of minutes in an hour. Continuing the same example, 3600 x 60 = 216,000 minutes. This figure represents the number of minutes until a certain date.

Multiply the minute figure by 60, the number of seconds in a minute. Continuing the same example, 216,000 x 60 = 12,960,000. This figure represents the number of seconds until a certain date.