workman has worked for 240 days or 190 days (in case he is employed below ground in a mine) during the period of 12 calendar months preceding the date with reference to which calculation is to be made, he shall be deemed to be in continuous service for a period of one year. In case of a retrenchment, the reference date will be the date on which the retrenchment order is passed. Therefore, if a workman has worked for 240 days (190 days in case he has worked below ground in a mine) during the period of 12 calendar months preceding the date of his retrenchment, the said workman is deemed to have rendered continuous service for a period of one year. Section 25B(2) refers to a period of 12 months immediately preceding and counting backwards from the relevant date and not to any other period of employment. If a workman has worked for more than 240 days during this period of 12 months prior to his retrenchment, he is deemed to be in continuous service for a year. The words "preceding the date with reference to which calculation is to be made" are not redundant or otiose. The period of 12 months mentioned in Section 25B(2)is not Therefore any period of 12 months but the immediately preceding 12 months with reference to which calculation is to be made.”