📘Date

🚧 under construction

JS ⟩ object ⟩ built-in ⟩ Date

points in time.

new Date()                                // current date and time
// month starts from 0, be careful❗️ 
new Date(2009, 11, 9)                     // December❗️ 
new Date(2009, 11, 9, 12, 59, 59, 999)

🧨 雷區

• month numbers start at 0 (11 = December),

• day numbers start at 1.

This is confusing and silly. Be careful❗

⭐️ 重點

Date is the only built-in type that uses "prefer-string" object -> primitive conversion algorithm.

💈範例

// Timestamps: 
// - milliseconds since the start of 1970 (UTC time zone).
new Date(2013, 11, 19).getTime()    // 1387407600000
Date.now                            // (current timestamp)

📗 參考

• Eloquent JS ⟩ The Date Class

📘 手冊

• Date