Idea of Minus 1 Month Icon
A calendar with two rings on the top and a negative sign next to a one and a lower case m. Located where the days of the month are usually at.
This Minus 1 Month icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.