NASA Distributed Active Archive Center (DAAC) at NSIDC
Ice, Cloud, and land Elevation / Geoscience Laser Altimeter System
The ICESat/GLAS Date Conversion Tool includes several options for obtaining information related to laser track start time. To use the tool, use only one of the conversion options at a time. For example, to find time data for Day 236 of Year 2006, use the third option below and fill in the Day of Year and Year fields, and click Convert.