Standards for date / time values?

Hi -

I'm working with a suite of date attributes that can include a combination of precise dates, imprecise dates, and ranges of dates (and the same types of time values). We'd like to follow existing standards. If this sort of date / time standard exists, I'd appreciate leads to the appropriate resources.

Thank you for your help - Lynn

Lynn Kutner Data Management Coordinator NatureServe Email: lynn_kutner@natureserve.org Phone: (303) 541-0360 www.natureserve.org