What would be the date and local time of a place located at 88B30 E longitude when the local time at 0s longitude is 19-00 hrs. of 28th February 2013?

To determine the local time at 88°30' E, we use the principle that the Earth rotates 360° in 24 hours, which equates to 15° per hour or 1° every 4 minutes [3]. Since the location is east of the Prime Meridian (0°), the local time is advanced [2]. The longitudinal difference is 88.5°. Multiplying 88.5 by 4 minutes gives a total time difference of 354 minutes, which is 5 hours and 54 minutes [2]. Adding this to the Greenwich time of 19:00 hrs on 28th February 2013 results in 24:54 hrs. Since 24:00 hrs marks the end of the day, the time becomes 00:54 hrs on the following day. As 2013 was not a leap year, the next day is 1st March. Therefore, the local time is 00:54 hrs on 1st March [3].

Sources

1. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > Longitude and Time > p. 243
2. [3] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 1: Locating Places on the Earth > Understanding Time Zones > p. 20