For instance, browser has performance.now() that gives the number of milliseconds from the start of page loading with microsecond precision (3 digits after the point): JavaScript itself does not have a way to measure time in microseconds (1 millionth of a second), but most environments provide it. Sometimes we need more precise time measurements. Note that unlike many other systems, timestamps in JavaScript are in milliseconds, not in seconds. Use Date.now() to get the current timestamp fast.That’s because a Date becomes the timestamp when converted to a number. Dates can be subtracted, giving their difference in milliseconds.Good for adding/subtracting days/months/hours. Date auto-corrects itself when out-of-range components are set.Days of week in getDay() are also counted from zero (that’s Sunday).Months are counted from zero (yes, January is a zero month).We can’t create “only date” or “only time”: Date objects always carry both. Date and time in JavaScript are represented with the Date object.The call to Date.parse(str) parses the string in the given format and returns the timestamp (number of milliseconds from UTC+0). Shorter variants are also possible, like YYYY-MM-DD or YYYY-MM or even YYYY.
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