Working with data in time fields
When entering data in time fields, type the date in the system format used when the file was created. Type the time of day (or time duration) as one of the following:
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Notes
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If you type a single digit, FileMaker Pro assumes it's the hour (typing 5 in a time field indexes it as 5:00:00).
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You can type a negative time duration in a time field, like –08:40:00. You can't type a negative time if Strict data type validation is defined for the field options. See Defining field validation.
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For ODBC data sources, the time field parameters are restricted. Minutes and seconds must be in the range of 0 to 59, and hours must be in the range of 0 to 23. Negative time values are not supported.
Related topics 
Finding numbers, dates, times, and timestamps
Defining time fields
Specifying formats for time fields
Setting options for fields
Inserting the current date or other variables into a field