Field Time
Stores time as hh:mm:ss.
#Date
Modules
Time Field
Adds a time only field.
Stores time as integers, some issues, including how to migrate date values into it.
See Field Time instead.
Recurring Events
Create recurring event series, generate event instances, event registration, calendar support.
Recurring Dates Field
Repeating date field.
Datetime Extras
Widgets and formatters for date fields.
Compact date/time range formatter
Compact formatting options for datetime range fields.
Month Year Field
Month/year only date field.
Projects
Drupal Calendar
Create a calendar with Drupal modules.
Project updates
TODO: Remove time from deadline
Project
The deadline field was created with date and time, so the form shows the time field. This isn't needed, so replace the field...
Resources
The DateTimeInterface interface
DateTimeInterface has constants for common date formats.