The daterange module provides a programatic extension for date ranges that can be used by other module developers. It creates new filters for node times, 'Node: Created Time Between' and 'Node: Changed Time Between', as well as new date range filters for CCK date (but not datestamp) fields.
If jscalendar is installed and enabled the date fields are augmented with the jscalendar button for selecting a date.
The supported operators are 'Custom date range', 'Outside date range', 'Before', 'After', 'within the past week', 'within the past month',
'within the past 3 months', 'within the past year'. When the the operator doesn't need both input fields, JavaScript attempts to undisplay the unused fields.
The date fields understand the words 'today' and 'yesterday' and subtraction of days, months, or years.