If one is particular not to get married past the 15th day of the month made a get married on the 30th day of the month which is the first day of Rosh Chodesh?<a href="#_ftn1" name="_ftnref1">[1]</a>
The 30th day of the month which is the first day of Rosh Chodesh is considered a valid date to get married, even if one is generally particular not to get married past the 30th day of the month.
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<a href="#_ftnref1" name="_ftn1">[1]</a> Igros Kodesh 9:46; 23:147; Nitei Gavriel Nissuin 47:7 footnote 23

Shulchan Aruch HaRav | If one is particular not to get married past the 15th day of the month made a get married on the 30th day of the month which is the first day of Rosh Chodesh?

If one is particular not to get married past the 15th day of the month made a get married on the 30th day of the month which is the first day of Rosh Chodesh?[1] The 30th day of the month which is the first day of Rosh Chodesh is considered

If one is particular not to get married past the 15th day of the month made a get married on the 30th day of the month which is the first day of Rosh Chodesh?