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We recommend that date-time information in granule file names adheres to the following guidelines:

• Adopt the ISO 8601 [11] standard for date-time information representation.
• If describing a date-time interval, the start date-time should appear before the end
  date-time.
• Date-time fields representing the temporal extent of a granule's data should appear before any other date-time field in the file name.
• All date-time fields should have the same format.

The recommended date-time formats are:

• Full resolution

YYYYMMDDThhmmss[,.]f+Z
YYYYMMDDThhmmssZ

• Reduced resolution

YYYYMMDDThhmmZ
YYYYMMDDThhZ
YYYYMMDD
YYYY-MM
YYYY

Where:

• Y is a digit used in the time element “year”
• M is a digit used in the time element “month”
• D is a digit used in the time element “day”
• T is the separator between the date and time parts
• h is a digit used in the time element “hour”
• m is a digit used in the time element “minute”
• s is a digit used in the time element “second”
• [,.] the decimal mark – either the comma or the full stop.
• f is a digit used in the decimal fraction of a second
• + means "one or more digits"
• Z is UTC time zone designator