is there an UTC mode?

The problem I had is the following. As I’m using CEST timezone the system changes from summer time to winter time (daylight saving time), and I get unexpected results when adding time to my dayjs object. moment has an UTC mode to set the timezone.

I also found that by default moment does this right I’ve attached a failing test. That shows that dayjs is doing different than moment.

test('adding 1 day before changing to daylight summer time', () => {
  const dayBeforeSummerTime = '2018-10-28'

  expect(dayjs(dayBeforeSummerTime).add(1, 'day')).toEqual(moment(dayBeforeSummerTime).add(1, 'day'))
})

I’ll be glad to help if I can. Thanks in advance

[iamkun]

DST already supported

[iamkun]

@d2bit

Daylight saving time is new to me, I’ll check it.

And for UTC mode, we are working on is, PR #168

Code review or PR is welcome.