# Kể từ: since / as of in Vietnamese (B2)

> Kể từ is a fuller, more formal từ: "since" or "from" a point in time. It goes before a date or an event, and the sentence says what holds from then on.

Source: https://vietnamesebuddy.com/grammar/ke-tu/ · Updated 2026-10-17

**since / as of**

Pattern: `kể từ + [date or event] · có hiệu lực kể từ ngày + [date]`

Level: B2 (our estimate) · Register: formal

Typed without accents: ke tu

*Kể từ* is a fuller, more formal *từ*: "since" or "from" a point in time. It goes before a date or an event, and the sentence says what holds from then on.

It has two main jobs. Looking forward, it sets the day a rule starts: *Quy định này có hiệu lực kể từ ngày 1/1/2027.* This regulation takes effect from 1 January 2027. Nearly every decree and official notice ends with a line like that. Looking back, it measures from a past point up to now: *Giá vàng đã tăng 12% kể từ đầu năm.* The gold price has risen 12% since the start of the year. Market news is full of *cao nhất kể từ …* (the highest since …) and *thấp nhất kể từ …* (the lowest since …).

Before an event, it usually takes *khi*: *kể từ khi nhà máy đi vào hoạt động* (since the factory started running). You'll also hear it in storytelling: *kể từ hôm đó* (from that day on).

*Kể từ* marks where a count begins. To mark where it stops, reports use *tính đến*: *Tính đến cuối tháng 9, …* As of the end of September, …

In everyday speech, plain *từ* does the job: *Từ tháng 5 tới giờ, xăng lên giá hoài.* Petrol has kept going up since May. In Hà Nội: *Từ tháng 5 đến giờ, xăng lên giá mãi.*

## Examples

- Quy định mới có hiệu lực kể từ ngày 1/1/2027. — The new regulation takes effect from 1 January 2027.
- Giá cà phê xuất khẩu đã tăng gần 20% kể từ đầu năm. — The export price of coffee has risen by nearly 20% since the start of the year.
- Đây là mức thấp nhất kể từ tháng 5/2025. — This is the lowest level since May 2025.
- Kể từ khi tuyến metro đi vào hoạt động, lượng xe máy qua khu vực đã giảm rõ rệt. — Since the metro line started running, the number of motorbikes passing through the area has fallen markedly.

## Compare

- [Since: từ … (tới giờ), từ khi, từ khi nào](https://vietnamesebuddy.com/grammar/tu-since/): since
- [As of (a date), up to: tính đến](https://vietnamesebuddy.com/grammar/tinh-den/): as of

Previous in News, official and academic writing: [Showing that (results, data): cho thấy](https://vietnamesebuddy.com/grammar/cho-thay/)
Next in News, official and academic writing: [Stating a share or a total: chiếm + percent, (ước) đạt + figure](https://vietnamesebuddy.com/grammar/chiem-account/)

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