When is the time for Tahajjud?

الاستفتاء

When is the beginning and the ending of the time of Tahajjud? Please tell me their exact time?

الجواب حامدا و مصلیا

The time of Tahajjud is after Isha Namaz until the time of true dawn. However the time of true dawn may differ between locations and may change depending on the condition of the whether, hence, one should look at the Salah chart for his current location.
And Allah knows best.