You need to change…

say $first_dt_utc->delta_days($second_dt_utc)->days(),
    ' days difference';

[download]
…to… 
say $first_dt_utc->delta_days($second_dt_utc)->delta_days(),
    ' days difference';

[download]

See How can I calculate the difference in days between dates? in FAQ: Sample Calculations on the DateTime project wiki.

In reply to Re^2: How to compare date/times in different timezones? by Jim
in thread How to compare date/times in different timezones? by philled

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