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use chrono::prelude::*;
use chrono_tz::US::Pacific;
let pacific_time = Pacific.ymd(1990, 5, 6).and_hms(12, 30, 45);
println!("size_of date time with tz = {}", ::std::mem::size_of_val(&pacific_time));
let dt = Utc.ymd(2014, 7, 8).and_hms(9, 10, 11);
println!("size_of date time = {}", ::std::mem::size_of_val(&dt));
let fixed_dt = FixedOffset::east(9 * 3600).ymd(2014, 7, 8).and_hms_milli(18, 10, 11, 12);
println!("size_of date time with fixed offset = {}", ::std::mem::size_of_val(&fixed_dt));gives output:
size_of date time with tz = 48
size_of date time = 12
size_of date time with fixed offset = 16
As you can see, DateTime carrying chrono-tz's TimeZone is a very expansive structure, occupying 48 bytes. This is bad for cache utilization and is expansive when copying the structure around.
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