The Date.UTC()
static method accepts parameters representing the date and time components similar to the Date constructor, but treats them as UTC. It returns the number of milliseconds since January 1, 1970, 00:00:00 UTC.
Syntax
Date.UTC(year)
Date.UTC(year, monthIndex)
Date.UTC(year, monthIndex, day)
Date.UTC(year, monthIndex, day, hour)
Date.UTC(year, monthIndex, day, hour, minute)
Date.UTC(year, monthIndex, day, hour, minute, second)
Date.UTC(year, monthIndex, day, hour, minute, second, millisecond)
Parameters
year
- : Integer value representing the year. Values from
0
to99
map to the years1900
to1999
. All other values are the actual year. See the example.
- : Integer value representing the year. Values from
monthIndex
- : Integer value representing the month, beginning with
0
for January to11
for December. Defaults to0
.
- : Integer value representing the month, beginning with
day
- : Integer value representing the day of the month. Defaults to
1
.
- : Integer value representing the day of the month. Defaults to
hours
- : Integer value between
0
and23
representing the hour of the day. Defaults to0
.
- : Integer value between
minutes
- : Integer value representing the minute segment of a time. Defaults to
0
.
- : Integer value representing the minute segment of a time. Defaults to
seconds
- : Integer value representing the second segment of a time. Defaults to
0
.
- : Integer value representing the second segment of a time. Defaults to
milliseconds
- : Integer value representing the millisecond segment of a time. Defaults to
0
.
- : Integer value representing the millisecond segment of a time. Defaults to
Return value
A number representing the timestamp of the given date. Returns NaN
if the date is invalid.
Description
Years between 0
and 99
are converted to a year in the 20th century (1900 + year)
. For example, 95
is converted to the year 1995
.
The UTC()
method differs from the Date() constructor in three ways:
Date.UTC()
uses universal time instead of the local time.Date.UTC()
returns a time value as a number instead of creating a Date object.- When passed a single number,
Date.UTC()
interprets it as a year instead of a timestamp.
If a parameter is outside of the expected range, the UTC()
method updates the other parameters to accommodate the value. For example, if 15
is used for monthIndex
, the year will be incremented by 1 (year + 1)
and 3
will be used for the month.
Because UTC()
is a static method of Date
, you always use it as Date.UTC()
, rather than as a method of a Date
object you created.
Examples
Using Date.UTC()
The following statement creates a Date object with the arguments treated as UTC instead of local:
const utcDate = new Date(Date.UTC(2018, 11, 1, 0, 0, 0));
Behavior of Date.UTC() with one argument
Date.UTC()
when passed one argument used to have inconsistent behavior, because implementations only kept the behavior consistent with the Date() constructor, which does not interpret a single argument as the year number. Implementations are now required to treat omitted monthIndex
as 0
, instead of coercing it to NaN
.
Date.UTC(2017); // 1483228800000