# TM PeriodDuration

From Federation of Earth Science Information Partners

The duration datatype represents a duration of time. The lexical representation for duration is the [ISO 8601] extended format PnYn MnDTnH nMnS, where nY represents the number of years, nM the number of months, nD the number of days, 'T' is the date/time separator, nH the number of hours, nM the number of minutes and nS the number of seconds. The number of seconds can include decimal digits to arbitrary precision.

<gts:TM_PeriodDuration>P0Y0M0DT6H0M0S</gts:TM_PeriodDuration>

This represents a frequency of every 6 hours.

- P = period
- 0Y = 0 years
- 0M = 0 month
- 0D = 0 days
- T = time
- 6H = 6 hours
- 0M = 0 minutes
- 0S = 0 seconds