It refers to the subsequent day following the current day, emphasizing a progression of days.
एक दिन के बाद का अगला दिन
English Usage: "Her mood can change from one day to the next."
Hindi Usage: "उसका मूड एक दिन से अगले दिन बदल सकता है।"
ek din ke baad agla, ek din ke baad aglaa, ek din ke baad agalaa
