TI-BASIC:Time And Date

The TI-84 Plus and TI-84 Plus SE, which have a built-in hardware clock, introduce several commands for dealing with time. Some of these rely on the built-in clock, while others are used for formatting times and dates and could technically have been introduced on earlier calculators. However, the only time/date command that is available on the pre-84 calculators is Dbd(.

All of these commands except dbd( can be found only through the command catalog (2nd CATALOG). Dbd( can also be found in the Finance menu -- 2nd FINANCE on the TI-83, and APPS 1:Finance... on the TI-83+ or higher.

Despite its name, the Time command has nothing to do with the clock. It is a mode setting for sequence graphs.

Low-Level Commands

• StartTmr -- This command returns the current value of a timer that is updated every second when the clock is enabled. This value doesn't correspond to any actual time, but can be used with CheckTmr( to get a time difference.
• CheckTmr( -- checkTmr(X) is equivalent to StartTmr-X. This can be used to get the time elapsed since startTmr was used.
• ClockOn, ClockOff -- Enables or disables the hardware clock.
• IsClockOn -- Tests if the clock is enabled or not.

Time Commands

• SetTime( -- Sets the current time, in hours, minutes, and seconds. If the clock is enabled, this time will be updated every second.
• GetTime -- Returns the current time as the list {hours, minutes, seconds}. This command is unaffected by time format.
• SetTmFmt( -- Sets the time format - 12 hour, or 24 hour.
• GetTmFmt -- Returns this time format setting.
• GetTmStr( -- Returns the current time as a string, affected by time format (though you can override it with an optional argument).

Date Commands

• SetDate( -- Sets the current date (year, month, and day). If the clock is enabled, this date will be updated as needed.
• GetDate -- Returns the current date as the list {year, month, day}. This command is unaffected by date format.
• SetDtFmt( -- Sets the date format - 1 for month/day/year, 2 for day/month/year, or 3 for year/month/day.
• GetDtFmt( -- Returns this date format setting.
• GetDtStr( -- Returns the current date as a string, affected by date format (though you can override it with an optional argument).

Time/Date Manipulation

• TimeCnv( -- Converts a number of seconds into a list of {days, hours, minutes, seconds} representing the same time lapse.
• DayOfWk( -- Returns the day of week (Sunday through Saturday encoded as 1 through 7) of a specified date.
• Dbd( -- Returns the number of days between two dates -- this command is available on all calculators, not just the 84+/SE.