Thoi gian hien tai bang mili giay: doc gia tri epoch truc tiep va dung dung cach
Cap nhat lan cuoi: 2026-05-24. Cong cu thoi gian hien tai bang mili giay mien phi tra ve gia tri epoch truc tiep ma trinh duyet thay ngay bay gio, bang mili giay ke tu 1970-01-01T00:00:00 UTC. Huong dan nay giai thich so do la gi, khi nao dung no thay vi giay, va ba hoac bon loi nho tao ra cac ngay trong lech hang thap ky.
Cap nhat lan cuoi: 2026-05-24
Gia tri truc tiep thuc su dai dien cho dieu gi
Thoi gian hien tai bang mili giay la mot so nguyen duy nhat dem co bao nhieu mili giay da troi qua ke tu epoch Unix, co dinh tai 1970-01-01T00:00:00 UTC. So nay khong phu thuoc mui gio: no khong mang mot lich, mot do lech, hay quy tac gio tiet kiem anh sang ban ngay. Khi ban thay 1779645000000 tren mot dong log va dong nghiep thay cung so do tren luc dia khac, ca hai dang nhin cung mot thoi diem; chi ket xuat de doc tren man hinh thay doi theo dia phuong.
Cong cu truc tiep doc gia tri ma trinh duyet thay qua Date.now() va in no ma khong co round-trip mang nao. Vi cong cu chay hoan toan trong trinh duyet, gia tri phan anh dong ho thiet bi ban dang dung - neu dong ho do da lech, gia tri phan anh do lech. Cho timestamp cap do kiem toan, uu tien gia tri do may chu phat ra (moi yeu cau web ma may chu xu ly deu mang timestamp do chinh xac cao). Cho viec doc nhanh khi go loi UI, mot dong log, hoac payload JSON, gia tri tu trinh duyet la du.
Bang du lieu nhanh
| Thuoc tinh | Gia tri |
|---|---|
| Dinh dang | So nguyen 13 chu so, khong phu thuoc mui gio |
| Goc epoch | 1970-01-01T00:00:00 UTC |
| Do chinh xac | 1 mili giay (1/1000 cua giay) |
| API doc trinh duyet | Date.now() hoac new Date().getTime() |
| API doc may chu | Java System.currentTimeMillis(); Python time.time() * 1000; Go time.Now().UnixMilli() |
| Cong cu thuc thi | https://freetoolonline.com/utility-tools/get-time-in-millisecond.html (trong trinh duyet, khong tai len) |
| Trinh chuyen doi di kem | mili giay thanh ngay |
Khi nao doc mili giay (va khi nao doc giay)
Lua chon giua mili giay va giay thuong lien quan den API hoac he thong ban dang tuong tac. JavaScript, Java, va hau het cac log dua tren JVM dung timestamp mili giay goc; shell Unix, nhieu API C, va mot loat dai giao thuc cu hon dung timestamp do chinh xac giay. Quy tac truc quan ngan: so 13 chu so la mili giay; so 10 chu so la giay. Tron lan hai cai nay la nguyen nhan pho bien nhat gay ra ngay trong lech hang thap ky - dua gia tri 13 chu so vao trinh phan tich ky vong giay cho ra nam khoang nam 58000.
Cho thao luan dai hon ve quyet dinh giay-vs-mili-giay (voi quy tac phat hien chinh xac 10-chu-so-vs-13-chu-so), doc huong dan di kem tai so dai: mili giay hay giay?. Cho cau hoi hien thi mui gio tiep theo sau khi chuyen doi thanh cong, doc mili giay thanh ngay: UTC vs gio dia phuong.
Cach sao chep gia tri mot cach sach se
- Mo cong cu thoi gian hien tai. So truc tiep hien thi o nep gap dau tien.
- Nhap nut copy ben canh gia tri, hoac chon va sao chep so nguyen 13 chu so thu cong.
- Dan vao dich - mot dong log, mot truong JSON (dung kieu number, khong phai string), mot header HTTP, hoac query string URL cho debug nhanh.
- Neu dich ky vong giay, bo ba chu so cuoi hoac chia cho 1000 (chia nguyen; khong lam tron). Neu ky vong ISO 8601, dan vao mili giay thanh ngay truoc.
Cau hoi thuong gap
Tai sao gia tri truc tiep thay doi moi lan toi mo trang?
Cong cu doc Date.now() tren moi lan tai trang, nen so phan anh khoanh khac tai do. Hai lan mo cach nhau mot phut khac nhau khoang 60000 (60 giay nhan 1000 mili giay). Gia tri khong phai so ngau nhien tinh; no la dong ho truc tiep.
Gia tri mili giay co phu thuoc mui gio cua toi khong?
Khong. Gia tri la so dem mili giay ke tu 1970-01-01T00:00:00 UTC. No khong di chuyen khi ban vuot mui gio hay khi gio tiet kiem anh sang ban ngay bat dau. Cai di chuyen la hien thi de doc - "19 thang 4, 2024, 15:00 UTC" doc la 22:00 o Bangkok hay 08:00 o Los Angeles, nhung so ben duoi giong nhau.
Toi co the tin tuong gia tri nay cho timestamp cap kiem toan khong?
Cho logging cap kiem toan, uu tien timestamp do may chu phat ra - moi may chu da ghi thoi gian yeu cau voi do chinh xac duoi giay va khong chiu anh huong tu do lech dong ho client. Gia tri trong trinh duyet phu hop cho debug, log demo, payload API mau, va cau hoi doc gia "bay gio la gi bang mili giay". Cho phan ung su co hoac logging bang chung phap ly, dinh tuyen qua may chu.
Quy tac 13-chu-so-vs-10-chu-so thuc su nghia la gi?
Timestamp Unix hien tai bang giay la so 10 chu so (nguong vuot qua nam 2001 tai 1000000000). Cung thoi diem bang mili giay la so do nhan voi 1000, la 13 chu so. Vay neu ban doc mot so tu log va co 13 chu so, do la mili giay; neu co 10 chu so, do la giay. Tron lan cho ngay nam 58000 hay nam 1970, ca hai deu khong phai dieu ban muon.
Tai sao doan JavaScript la Date.now() ma khong phai new Date()?
Ca hai tra ve cung gia tri khi ep thanh so. Date.now() la phuong thuc tinh tren ham tao Date; no tra ve so nguyen thuy truc tiep va la cach doc re nhat. new Date() tra ve doi tuong Date co phuong thuc .getTime() tra ve cung so. Cho logging va timestamp, Date.now() la loi goi dac trung.
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