A person's birthday is usually recorded according to the time zone of the place of birth. Thus people born in Samoa at 11:30 pm will record their birthdate as one day before Coordinated Universal Time (UTC) and those born in the Line Islands will record their birthdate one day after UTC. They will apparently be born two days apart, while some of the apparently older ones may be younger in hours. Those who live in different time zones from their birth often exclusively celebrate their birthdays at the local time zone. In addition, the intervention of Daylight Saving Time can result in a case where a baby born second being recorded as having been born up to an hour before their predecessor.

वाढदिवस साजरा करण्याबद्दलच्या अंधश्रद्धा
जयंती
Timezones and birthdays
सांस्कृतिक संकेत आणि कायदेविषयक नियम