Add time zone offset to requests

Divide the world into time bands of custom size and forward time zone data to your origin server.

VCL

Use this solution in your VCL service (click RUN below to test this solution or clone it to make changes):

Compute@Edge

Use this solution in your Compute@Edge service:

Rust

    let geo = req.get_client_ip_addr().and_then(geo_lookup).unwrap();

    // setting date/time variables
    let utc_dt = Utc::now();
    let local_dt = utc_dt.with_timezone(&geo.utc_offset());
    let offset = fastly::geo::FixedOffset::local_minus_utc(&local_dt.offset());

    // Add TZ in ISO8601 format
    req.set_header("tz-offset-iso8601", local_dt.format("%z").to_string());
    // Parse the time offset into a decimal number of hours
    req.set_header("tz-offset-hours", format!("{:.3}", (offset / HOUR)));
    // Round to a whole hour
    req.set_header("tz-hour", (offset / HOUR).to_string());
    // Round to nearest even hour
    req.set_header(
        "tz-evenhour",
        ((offset as f32 / HOUR as f32 / 2.0).round() as i32 * 2).to_string(),
    );