Meet the deceased again: JavaScript Date

Cause

The reason why I want to record JavaScript Date is because I have recently discovered several new uses of Date, which I haven't noticed before, so record it.

Print the value of the Date instance

new Date()					// Tue Jun 16 2020 00:47:33 GMT+0800 (中国标准时间)
new Date().toString()		// "Tue Jun 16 2020 00:47:59 GMT+0800 (中国标准时间)"
new Date().toUTCString()	// "Mon, 15 Jun 2020 16:47:59 GMT"
new Date().toISOString() 	// GMTString | LocaleString ...
new Date().valueOf()		// 1592239679948
new Date().getTime()		// 1592239679948
+new Date()					// 1592239679948

Date instance addition and subtraction

+date				// 1592239679948	# Tue Jun 16 2020 00:47:59 GMT+0800 (中国标准时间)
+secondDate			// 1592240090940	# Tue Jun 16 2020 00:54:50 GMT+0800 (中国标准时间)

secondDate - date	// 410992			# 410992 / 1000 / 60 ≈ 6.85 m

secondDate + date	// "Tue Jun 16 2020 00:54:50 GMT+0800 (中国标准时间)Tue Jun 16 2020 00:47:59 GMT+0800 (中国标准时间)"
+secondDate + date	// "1592240090940Tue Jun 16 2020 00:47:59 GMT+0800 (中国标准时间)"
+secondDate + +date	// 3184479770888	# Sat Nov 29 2070 17:42:50 GMT+0800 (中国标准时间)

new Date(+date + 1000 * 60 * 7)			// Tue Jun 16 2020 00:54:59 GMT+0800 (中国标准时间)	# date 7 min 后
new Date(+date + 1000 * 60 * 60 * 24)	// Wed Jun 17 2020 00:47:59 GMT+0800 (中国标准时间)	# date 1天后

Date Automatically convert year, month and day

// 6月共30天
const Jun30 = new Date("2020-06-30")			// Tue Jun 30 2020 08:00:00 GMT+0800 (中国标准时间)

new Date(+Jun30 + 1000 * 60 * 60 * 24)			// Wed Jul 01 2020 08:00:00 GMT+0800 (中国标准时间)
new Date(+Jun30 + 1000 * 60 * 60 * 24 * 32)		// Sat Aug 01 2020 08:00:00 GMT+0800 (中国标准时间)
new Date(+Jun30 + 1000 * 60 * 60 * 24 * 365)	// Wed Jun 30 2021 08:00:00 GMT+0800 (中国标准时间)

// 2020年2月共29天
const Feb28 = new Date("2020-02-28")			// Fri Feb 28 2020 08:00:00 GMT+0800 (中国标准时间)

new Date(+Feb28 + 1000 * 60 * 60 * 24)			// Sat Feb 29 2020 08:00:00 GMT+0800 (中国标准时间)	# 自动计算闰年
new Date(+Feb28 + 1000 * 60 * 60 * 24 * 366)	// Sun Feb 28 2021 08:00:00 GMT+0800 (中国标准时间)

to sum up

1. +new Date() Equivalent to new Date().getTime()
2. Date instances can be added and subtracted
3. Date automatically converts year, month and day (including leap year and February)