format("z") seems to have issues with timezones

[rejhgadellaa]

In Chrome's console:

new Date(1534545439635);
Sat Aug 18 2018 00:37:19 GMT+0200 (Central European Summer Time)

new Date(1534545439635).format("z");
"229"

The same day but later:

new Date(1534588427903)
Sat Aug 18 2018 12:33:47 GMT+0200 (Central European Summer Time)

new Date(1534588427903).format("z");
"230"

The timestamp at 00:37:19 returns "229" but the timestamp of the same day at 12:33:47 returns "230"

Note: Central European Summer Time is GMT +02:00 ;)

[rejhgadellaa]

After a quick google I think I found a solution that seems to work on SO:
https://stackoverflow.com/a/26426761/781094

I've hacked it in your dateformat library and the results are promising ;)