timeshift

Adjusts timestamps relative to a given start time, with an optional speedup.

timeshift field, [start=time, speed=double]

Description

The timeshift operator adjusts a series of time values by anchoring them around a given start time.

With speed, you can adjust the relative speed of the time series induced by field with a multiplicative factor. This has the effect of making the time series "faster" for values great than 1 and "slower" for values less than 1.

<field>

The field containing the timestamp values.

start = time (optional)

The timestamp to anchor the time values around.

Defaults to the first non-null timestamp in field.

speed = double (optional)

A constant factor to be divided by the inter-arrival time. For example, 2.0 decreases the event gaps by a factor of two, resulting a twice as fast dataflow. A value of 0.1 creates dataflow that spans ten times the original time frame.

Defaults to 1.0.

Examples

Set the M57 Zeek logs to begin at Jan 1, 1984:

load_http "https://storage.googleapis.com/tenzir-datasets/M57/zeek-all.log.zst" 
decompress "zstd"
read_zeek_tsv
timeshift ts, start=1984-01-01

As above, but also make the time span of the trace 100 times longer:

load_http "https://storage.googleapis.com/tenzir-datasets/M57/zeek-all.log.zst" 
decompress "zstd"
read_zeek_tsv
timeshift ts, start=1984-01-01, speed=0.01