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Jyutping dai6 jat1 si4 gaan3
Pinyin dì yī shí jiān

Definitions (CC-CEDICT)
  1. in the first moments (of sth happening)
  2. immediately (after an event)
  3. first thing
Definitions (粵典–words.hk)
  1. 副詞
    即刻
    immediately
    • 佢一入門口,就第一時間衝咗入廁所。
      佢一入门口,就第一时间冲咗入厕所。
      keoi5 jat1 jap6 mun4 hau2, zau6 dai6 jat1 si4 gaan3 cung1 zo2 jap6 ci3 so2.
      He rushed to the washroom the instant he got back home.
Definitions (Wiktionary)
  1. adv, idiomatic
    immediately; at once; right away
    (syn.) 立即, 立刻, 當即, 当即, 立馬, 当时, 应时, 立马, 眼看, 應時, 眼见, 立时, 顿时, 登即, 即時, 及时, 當時, 隨即, 立時, 眼見, 即便, 随手, 登时, 登時, 及時, 马上, 即刻, 頓時, 隨手, 即时, 随即, 馬上
Definitions (Kaifangcidian)
  1. 立刻
  2. 馬上 – 马上
  3. 立即
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    如果有什么更好的解决方案,我一定第一时间通知您。
    如果有什麼更好的解決方案,我一定第一時間通知您。
    rú guǒ yǒu shén me gèng hǎo de jiě jué fāng àn , wǒ yī dìng dì yī shí jiān tōng zhī nín 。
    • If there's a better solution, then I'll notify you about it as soon as possible.
  2. Mandarin
    决定好的话请第一时间告诉我。
    決定好的話請第一時間告訴我。
    jué dìng hǎo de huà qǐng dì yī shí jiān gào sù wǒ 。
    • Please let me know as soon as it's decided.
Examples (粵典–words.hk)
  1. Cantonese
    意外发生之后,政府第一时间居然唔系救灾,反而系封锁消息。
    意外發生之後,政府第一時間居然唔係救災,反而係封鎖消息。
    ji3 ngoi6 faat3 sang1 zi1 hau6, zing3 fu2 dai6 jat1 si4 gaan3 geoi1 jin2 m4 hai6 gau3 zoi1, faan2 ji4 hai6 fung1 so2 siu1 sik1.
    • After the accident happened, what the government did instantly was not to rescue but to block the flow of news.
  2. Cantonese
    第一时间
    第一時間
    dai6 jat1 si4 gaan3
    • immediately
  3. Cantonese
    佢一入门口,就第一时间冲咗入厕所。
    佢一入門口,就第一時間衝咗入廁所。
    keoi5 jat1 jap6 mun4 hau2, zau6 dai6 jat1 si4 gaan3 cung1 zo2 jap6 ci3 so2.
    • He rushed to the washroom the instant he got back home.
  4. Cantonese
    好彩守门员反应快。第一时间双龙出海将个波挡出。
    好彩守門員反應快。第一時間雙龍出海將個波擋出。
    • Fortunately the goalkeeper has a quick reaction, he instantly punched the ball away from the goal with both fist.
  5. Cantonese
    有乜依郁,第一时间打俾我。
    有乜依郁,第一時間打俾我。
    jau5 mat1 ji1 juk1, dai6 jat1 si4 gaan3 daa2 bei2 ngo5.
    • In case something bad happens, call me immediately.