Find today's exact Asr time for your location — choose the Standard or Hanafi shadow-length school, since Asr timing differs slightly between madhhabs.
Asr begins at (Standard)
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Hijri date: —
The Hanafi school takes an object's shadow reaching twice its length as the start of Asr (vs. once its length for the other schools), which places Hanafi Asr somewhat later. Confirm with your local mosque if unsure which your community follows.