Add to a Date in intervals of different size, from milliseconds to years
| Parameter | Type | Description |
|---|---|---|
| date | Date | Date object to start with |
| interval | String | A string representing the interval. One of the following: "year", "month", "day", "hour", "minute", "second", "millisecond", "quarter", "week", "weekday" |
| amount | int | How much to add to the date. |
Compare two date objects by date, time, or both.
Returns 0 if equal, positive if a > b, else negative.
| Parameter | Type | Description |
|---|---|---|
| date1 | Date | Date object |
| date2 | Date |
Optional Date object. If not specified, the current Date is used. |
| portion | String |
Optional A string indicating the "date" or "time" portion of a Date object. Compares both "date" and "time" by default. One of the following: "date", "time", "datetime" |
Get the difference in a specific unit of time (e.g., number of months, weeks, days, etc.) between two dates, rounded to the nearest integer.
| Parameter | Type | Description |
|---|---|---|
| date1 | Date | Date object |
| date2 | Date |
Optional Date object. If not specified, the current Date is used. |
| interval | String |
Optional A string representing the interval. One of the following: "year", "month", "day", "hour", "minute", "second", "millisecond", "quarter", "week", "weekday" Defaults to "day". |
Returns the number of days in the month used by dateObject
| Parameter | Type | Description |
|---|---|---|
| dateObject | Date |
Get the user's time zone as provided by the browser
Try to get time zone info from toString or toLocaleString method of the Date object -- UTC offset is not a time zone. See http://www.twinsun.com/tz/tz-link.htm Note: results may be inconsistent across browsers.
| Parameter | Type | Description |
|---|---|---|
| dateObject | Date | Needed because the timezone may vary with time (daylight savings) |
Determines if the year of the dateObject is a leap year
Leap years are years with an additional day YYYY-02-29, where the year number is a multiple of four with the following exception: If a year is a multiple of 100, then it is only a leap year if it is also a multiple of 400. For example, 1900 was not a leap year, but 2000 is one.
| Parameter | Type | Description |
|---|---|---|
| dateObject | Date |