I. Overview
This article introduces the JavaScript date methods that are commonly used and provides several examples to demonstrate usage of this methods.
II. Commonly Used Date Methods
| Method | Description |
|---|---|
getDate() | Return the day of the month (1 ~ 31) |
getDay() | Return the day of the week (0 ~ 6) |
getFullYear() | Return the year |
getMonth() | Return the month (0 ~ 11) |
getHours() | Return the hour, according to local time (0 ~ 23) |
getMinutes() | Return the minutes, according to local time (0 ~ 59) |
getSeconds() | Return the seconds, according to local time (0 ~ 59) |
getMilliseconds() | Return the milliseconds, according to local time(0 ~ 999) |
getTime() | Return the number of milliseconds since 1970/01/01 |
setDate() | Set the day of the month (1 ~ 31) |
setMonth() | Set the month (0 ~ 11) |
setFullYear() | Set the year (4 digits) |
setHours() | Set the hour (0 ~ 23) |
setMinutes() | Set the minutes (0 ~ 59) |
setSeconds() | Set the seconds (0 ~ 59) |
setMilliseconds() | Set the milliseconds (0 ~ 999) |
setTime() | Set a date and time by adding or subtracting a specified number of milliseconds to/from midnight January 1, 1970 |
toDateString() | Convert today's date into a readable string |
toTimeString() | Convert the time portion of a Date object to a string |
toLocaleString() | Convert a Date object to a string, using locale conventions |
toLocaleDateString() | Return the Date object as a string, using locale conventions |
toLocaleTimeString() | Return the time portion of a Date object as a string, using locale conventions |
Note: The date methods must be applied on a date object.
III. Examples
Design the parameter pane and the style is as follows:
3.1 Get the current date
Goal: When you click the "button", the date widget displays the current date.
Add a Click event to the button, the JavaScript code is as follows:
var mydate = new Date(); //Create a date object, the value is the current date (including hours, minutes and seconds)
this.options.form.getWidgetByName("date").setValue(mydate); //Assign value to date widget
The effect is as follows:
3.2 Get the date value of the previous day
You can use method setDate() to apply day addition and subtraction operations on date value. Based on the above example, the goal is to let the date widget display the day before the current date after clicking the button.
The code to modify the click event is as follows:
var mydate = new Date(); //Create a date object, the value is the current date (including hours, minutes and seconds)
mydate.setDate(mydate.getDate()-1); //Set the "day" in the date object to the current day -1
this.options.form.getWidgetByName("date").setValue(mydate); //Assign value to date widget
The effect is as follows:
3.3 Get the date value of one month before the current date
You can use method setMonth() to apply month addition and subtraction operations on date value. The goal is to let the date widget display the date which is month before the current date after clicking the button.
Modify the click event as follows:
var mydate = new Date(); //Create a date object, the value is the current date (including hours, minutes and seconds)
mydate.setMonth(mydate.getMonth()-1); //Set the "month" in the date object to the current month -1
this.options.form.getWidgetByName("date").setValue(mydate); //Assign value to date widget
The effect is as follows:
Note: The addition and subtraction of the date, month, year, etc., are all realized by using the corresponding get method first, and then modify the value using the set method.
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