The amount of seconds to subtract from the current time when comparing the "not before" claim, to allow for a small tolerance time frame. Only taken into consideration if {@link #validate_nbf} is set to <code>1</code>.
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The amount of seconds to subtract from the current time when comparing the "not before" claim, to allow for a small tolerance time frame. Only taken into consideration if {@link #validate_nbf} is set to <code>1</code>.