Note: It's important to keep in mind that while the time value at the heart of a Date object is UTC, the basic methods to fetch the date and time or its components all work in the local (i.e. host system) time zone and offset.
It should be noted that the maximum
Date is not of the same value as the maximum safe integer (
Number.MAX_SAFE_INTEGER is 9,007,199,254,740,991). Instead, it is defined in ECMA-262 that a maximum of ±100,000,000 (one hundred million) days relative to January 1, 1970 UTC (that is, April 20, 271821 BCE ~ September 13, 275760 CE) can be represented by the standard
Date object (equivalent to ±8,640,000,000,000,000 milliseconds).