Analyzing past UTC date times results in a peculiar shift in time zones

When I receive various times in UTC from a REST application, I encounter different results.

Examples include 2999-01-30T23:00:00.000Z and 1699-12-30T23:00:00.000Z.

To display these times on the front end, I use new Date(date) in JavaScript to convert them to Time.

The issue arises with the resulting format of the converted time.

new Date("2999-01-30T23:00:00.000Z")
shows as 
Thu Jan 31 2999 00:00:00 GMT+0100
, which is expected behavior.

However, 

new Date("1699-12-30T23:00:00.000Z")
displays as 
Wed Dec 30 1699 23:57:44 GMT+0057
.

Why does this unexpected output occur? What causes this peculiar time shift?

I am curious about finding the root of the problem or if there is any solution available. Unfortunately, my search has been unsuccessful so far.

javascripttypescriptdatetimeutc

Answer №1

Traveling back to the year 1699 takes us to a time when timezones were completely different than what we know today. For instance, in Denmark, the switch to CET did not occur until 1894, resulting in:

new Date("1893-12-31T00:00:00.000Z");
// Sun Dec 31 1893 00:50:20 GMT+0050 (Central European Standard Time)
new Date("1894-01-01T00:00:00.000Z");
// Mon Jan 01 1894 01:00:00 GMT+0100 (Central European Standard Time)

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