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Rather than give a value in seconds, many durations can be expressed using a shorthand notation. For example, in a skin configuration file skin.conf, a value for aggregate_interval can be given as either

aggregate_interval = 3600


aggregate_interval = 1h

The same notation can be used in trends. For example:

<p>Barometer trend over the last 2 hours: $trend(time_delta='2h').barometer</p>

Here is a summary of the notation:

Example Meaning
10800 3 hours
3h 3 hours
1d 1 day
2w 2 weeks
1m 1 month
1y 1 year
hour Synonym for 1h
day Synonym for 1d
week Synonym for 1w
month Synonym for 1m
year Synonym for 1y