TimeCalc also has some user options for defining special dates and different time zones.
The primary reference time is Universal Time (UT, also known as GMT).

The user options for dates specify the number of days since a given date and is useful for tracking days of a mission, such as the NASA UARS and TIMED satellites that are the default preferences.

The user options for times permits the display of the time in two other time zones besides the primary UT display and is useful for displaying local time.

The TimeCalc.zip file contains the TimeCalc.prc application and a HTML manual for TimeCalc.

Update Description:
v1.6 (Mar. 6, 2004):
- Update with the 3 user times can be either time zone clocks (e.g., EST) or second counters (e.g., GPS).

v1.5 (Jan. 20, 2003):
- Updated with option to load the contact times from a Memo record
- Option to display fraction of day for the Day of Year
- And color icons for the time tools

v1.4 (Dec 6, 2002):
- Updated so that the DATE is displayed in the format specified by the user in the System PreferencesVer.

v1.3 (Sept. 9, 2002):
- Changed GPS Time to be a second counter with user-defined start date.

This latest TimeCalc, version 1.2 also includes several time tools:
- A stopwatch
- A up/down timer
- An alarm
- And a satellite contact time alarm.
- For the contact time, the user can set the times for the contact along with alarm options
- And then TimeCalc graphically displays the time until the contact begins.