Summarize the following court judgment. s the event of redemption happened. The doc trine of id certum est quod certum reddi potest is clearly applicable to the case. [290D E] & CIVIL APPELLATE JURISDICTION: Civil Appeal No. 4754 of 1989. From the Judgment and Order dated 17.5.1989 of the Rajasthan High Court in S.B. Civil Revision Petition No 450 of 1988. V.M. Tarkunde	 B.L. Kachhawan and Badridas Sharma for the Appelant. Aruneshwar Gupta and section Kumar for the Respondent. The Judgment of the Court was delivered by SHARMA	 J. Special leave is granted. This appeal arises out of a suit filed by the re spondent against her brother	 the appellant	 for specific performance of an alleged contract of sale dated 23.6.1965 in respect of a house. The property was under a mortgage and according to the plaintiff 's case	 the defendant had agreed to execute a deed of sale on the redemption of the mort 289 gage by her	 which she did in 1970. In spite of her repeated demands the defendant failed to respect the agreement which necessitated the institution of the suit. The defendant appellant	 besides pleading limitation	 denied the agreement as also the plaintiff 's allegation that she had redeemed the mortgage. The question of limitation was taken up by the trial court as a preliminary issue and decided in favour of the plaintiff. The order has been confirmed by the High Court by the impugned judgment. The plaintiff served a notice in July 1984 demanding specific performance before filing the suit. It has been contended on behalf of the appellant that since the alleged agreement is said to have been executed in June 1965	 the suit is barred by limitation	 and alternatively	 even count ing the period of limitation from the alleged redemption in 1970	 the suit has been filed after more than 14 years	 that is	 long after the expiry of three years ' period prescribed under Article 54 of the of 1963. The High Court has rejected the argument holding that since the cause of action of the suit was dependent on the redemption of the mortgage and no period was fixed within which it was neces sary for the respondent to have redeemed the mortgage	 it cannot be said that a date was 'fixed ' within the meaning of the third column of Article 54	 which reads thus: Description period of Time from which of suit limitation period begins to run "54. For specific three years The date fixed for the per performance. formance	 or	 if no such date is fixed	 when the plaintiff has notice that performance is refused. " As the notice preceding the suit was admittedly served within three years	 the defendant 's plea of limitation was rejected. The relevant provisions in the alleged agreement of sale as quoted in the judgment of the trial court reads as follows: 290 "This house is under mortgage with Jethmal Bastimal for Rs. 1000. When you will get this house	 the description of which is given below	 redeemed from M/s Jeth Mat Bastimal and take the papers of the registry in your pos session	 on that day I will have the sale deed of the said house	 written	 executed and registered in your favour." (emphasis supplied The question is whether a date was 'fixed ' for the perform ance of the agreement and in our view the answer is in the affirmative. It is true that a particular date from the calander was not mentioned in the document and the date was not ascertainable originally	 but as soon as the plaintiff redeemed the mortgage	 it became an ascertained date. If the plaintiff had	 immediately after the redemption	 flied the suit	 could it be thrown out on the ground that she was not entitled to the specific performance asked for? We do not think so. She would have been within her rights to assert that she had performed her part of the contract and was entitled to insist that her brother should complete his part. The agreement is a typical illustration of a contin gent contract within the meaning of section 31 of the and became enforceable as soon as the event of redemption (by the plaintiff hereself) happened. We agree with the view of the Madras High Court in R. Muniswami Goundar and Another vs B.M. Shamanna Gouda and Others	 expressed in slightly different circum stances. The doctrine of id certurn est quod certum reddi potest is clearly applicable to the case before us which in the language of Herbert Broom (in his book dealing with legal maxims) is that certainty need not be ascertained at the time; for if	 in the fluxion of time	 a day will arrive which will make it certain	 that is sufficient. A similar question had arisen in Duncombe vs The Brighton Club and Norfolk Hotel Company	 	 relied upon in the Madras case. Under an agreement	 the plaintiff had supplied some furniture to the defendant for which payment was made but after .some delay. He claimed interest. The rule at Common Law did not allow interest in such a case	 and the plaintiff in support of his claim relied upon a statutory provision which could come to his aid only if the price was payable at a certain time. Blackburn	 J. observed that he did not have the slightest hasitation in saying that the agreement contemplated a particular day	 which	 when the goods were delivered would be ascertained	 and then the money would be payable at a certain time; but rejected the plaintiff 's demand on the ground that the price did not become payable by the written instrument at a certain time. The other learned Judges did not agree with him	 and held that the statute did 291 not require that the document should specify the time of payment by mentioning the day of payment. If it specified the event upon which the payment was to be made	 and if the time of event was capable of being ascertained	 the require ments of the section were satisfied. The same is the posi tion in the case before us. The requirement of Article 54 is not that the actual day should necessarily be ascertained upon the face of the deed	 but that the basis of the calcu lation which was to make it certain should be found therein. We	 accordingly	 hold that under the agreement the date for the defendant to execute the sale deed was fixed	 although not by mentioning a certain date but by a reference to the happening of a certain event	 namely	 the redemption of the mortgage; and	 immediately after the redemption by the plaintiff	 the defendant became liable to execute the sale deed which the plaintiff was entitled to enforce. The period of limitation thus started running on that date. The case is	 therefore	 covered by the first part of Article 54 (third column) and not the second part. The learned counsel for the respondent relied on several decisions in support of the opinion of the High Court in the impugned judgment but they do not appear to help him. In Sathula Venkanna vs Namuduri Venkatakrishnayya and Another	 	 it was observed that in cases where a right to enforce specific performance vests in a third party to whom the ascertainment of the date on which performance becomes due need not necessarily be known	 the doctrine certum est quod certum reddi potest does not apply. Without expressing their final opinion the learned Judges observed that it might be right to apply the doctrine be tween the actual parties to the contract who would get the benefit and be subject to the liabilities under that con tract; "but in cases where a person is entitled to bring a suit on the contract who may not and need not	 and very likely may not be aware of the date becoming fixed"	 the doctrine could not apply. In Kruttiventi Mallikharjuna Rao vs Vemuri Pardhasaradhirao	 AIR 1944 Madras 2 18	 the vendor promised to execute the sale deed when both of his brothers	 who were studying elsewhere	 returned to the village. It was held that it was not a case where it could be said that a date was fixed for the performance of the contract as the event mentioned therein was too indefinite to be regarded as fixing a date. The performance was dependant on both the brothers of the vendor coming to the village	 in which the intending purchaser had no say at all. Apart from the ques tion of limitation	 the defendant could not effectively rely upon such a clause to defeat the very contract. In Kashi Prasad vs Chhabi Lal and Others	 AIR 1933 Allahabad 410(2)	 the plaintiff created two usufructuary mortgages and there after a third mortgage in 292 favour of the defendants for a sum of Rs.8	500. Out of this sum an amount of Rs.6	000 was left with the mortgagees for payment to the earlier creditors. The suit was instituted on the allegation that the defendants had failed to redeem the earlier mortgages. The plaintiff prayed for a direction to the defendants to redeem the mortgages. The document did not indicate as to the time when the defendants were obliged to redeem the earlier mortgages	 and a plea of limitation was taken on the ground that the date was fixed by necessary implication and could be ascertained by reference to the surrounding circumstances. In this background the court observed that the use of the word 'fixed ' implies that it should be fixed definitely and should not be left to be gathered from surrounding circumstances of the case. All these cases are clearly distinguishable. For the reasons mentioned above	 the impugned judg ments of the High Court and the trial court are set aside and the suit is dismissed. The appeal is accordingly al lowed	 but the parties are directed to bear their own costs throughout. P.S.S. Appeal allowed.

The period of limitation of three years for specific performance of a contract begins to run under the third column of Article 54 of the from the date fixed for the performance	 or	 if no such date is fixed	 when the plaintiff has notice that performance is refused. Under an agreement dated June 23	 1965 the plaintiff respondent	 sister of the defendant appellant	 undertook to redeem the disputed property under mortgage and the appel lant agreed to execute the sale deed of the said property in her favour on the date she took papers of the registry in her possession. She redeemed the property in 1970. The appellant	 however	 failed to respect the agreement in spite of repeated demands. The respondent served a notice in July 1984 demanding specific performance before filing the suit. The appellant pleaded limitation. The trial court decided the issue in favour of the respondent. That order was confirmed by the High Court on the view that since the cause of action of the suit was dependent on the redemption of the mortgage and no period was fixed within which it was necessary for the respondent to have redeemed the mortgage	 it could not be said that a date was ' 'fixed" within the meaning of the third column of Article 54. Allowing the appeal by special leave	 HELD: 1.1 The requirement of Article 54 of the Limita tion Act	 1963 is not that the actual day should necessarily be ascertained upon the face of the deed	 but that the basis of the calculation which was to make it certain should be found therein. [291A B] 1.2 In the instant case	 under the agreement the date for the appellant to execute the sale deed was fixed	 al though not by mentioning 288 a certain date but by a reference to the happening of a certain event	 namely	 the redemption of the mortgage; and	 immediately after the redemption by the respondent	 the appellant became liable to execute the sale deed which the respondent was entitled to enforce. The period of limitation thus started running on that date. The case	 is	 therefore	 covered by the first part of Article 54 (third column) and not the second part. [291B C] R. Muniswami Goundar & Anr. B.M. Shamanna Gouda & Ors.	 and Duncombe vs The Brighton Club Sathula Venkanna vs Namuduri Venkatakrishnayya & Anr.	 ; Kruttiventi Mallikharjuna Rao vs Vemuri Pardhasaradhirao	 AIR 1944 Madras 218 and Kashi Prasad vs Chhabi Lal & Ors '.	 AIR 1933 Allahabad 410 (2) distin guished 2. The agreement in the instant case is a typical illustration of a contingent contract within the meaning of section 31 of the