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`Delta t = t_2 - t_1`

Enter a value for all fields

The **Delta t** calculator computes the difference between two times, time 2 (t_{2}) and time 1 (t_{1}).

**INSTRUCTIONS**: Choose units and enter the following:

- (
**t**) The initial reference time_{1} - (
**t**) The second reference time_{2}

**Delta t (?t):** The calculator returns the difference in seconds. However, this can be automatically converted to compatible units via the pull-down menu.

The formula for the change in time is:

?t = t_{2} - t_{1}

where:

- ?t is the difference in time between the two reference times.
- t
_{1}is time reference point one. - t
_{2}is time reference point two.

- Light and Matter(Dr. Benjamin Crowell) Chapter 2.2 Describing Distance and Time