It's unusual to have such a wide delivery window. "By March 18th" for example, would signify on or before the 18th. "By March" means some time during March.
1 février 2015
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'By' means 'at the latest', and can usually be understood as 'during or before'.
This means that if you haven't received it already it could arrive in February or during March.
2 février 2015
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