return a Date in milliseconds
The millisecond representation of the specified Date object date—that is, the number of milliseconds between midnight (GMT) on 1/1/1970 and the date and time specified by date.
getTime()converts a date and time to a single integer. This is useful when you want to compare two Date objects or to determine the time elapsed between two dates. Note that the millisecond representation of a date is independent of the time zone, so there is no getUTCTime() method in addition to this one. Don’t confuse this getTime() method with the getDay() and getDate() methods, which return the day of the week and the day of the month, respectively.
Date.parse() and Date.UTC() allow you to convert a date and time specification to a millisecond representation without going through the overhead of first creating a Date object.
determine the offset from GMT
The difference, in minutes, between GMT and local time.
The return value is measured in minutes, rather than hours, because some countries have time zones that are not at even one-hour intervals.欢迎转载,转载请注明来自一手册:http://yishouce.com/book/1/28153.html