Google Search campaigns can be tailored to promote her company’s sales event “By creating a new ad group for the sale” and “By setting campaign start/end dates”
More importantly you can use COUNTDOWN and GLOBAL_COUNTDOWN function. You can let potential customers know about sales or special events by adding a countdown to your ad text.
Both countdown functions count down by day, then by hour, then by minute. So a line of ad text with a countdown customizer might say “Hurry, sale ends in 3 hours,” and then 2 hours and 28 minutes later say, “Hurry, sale ends in 32 minutes.”
Learn more here: https://support.google.com/google-ads/answer/6193743