Williamson's giant innings eclipsed his previous best, an unbeaten 242 against Sri Lanka nearly six years ago.
Holder called correctly, eagerly sent in New Zealand and Williamson finished the day 97 not out approaching his 21st test century with Ross Taylor 31 not out and the home team 243-2 .
The right-handed batsman achieved the feat on day one of the ongoing first Test against West Indies.
Kane Williamson has confirmed that Will Young will make his Test debut when the team takes on West Indies in the first game.
Williamson's counter-attacking 67 went in vain as Delhi Capitals made it to their maiden IPL final with a 17-run win over Hyderabad in the second Qualifier here on Sunday.
Williamson scored an unbeaten 50 of 44 balls to lead SRH to victory against Royal Challengers Bangalore (RCB) in Eliminator on Thursday at the Sheikh Zayed Stadium.
The incident took place during the 10th over of SRH's chase of 121 when Williamson was facing pacer Isuru Udana on Saturday evening.
A loss would have almost killed off MS Dhoni and co's chances of qualifying for the knockout stages.
There was a mix-up between Williamson and Garg in the middle and as a result, the New Zealand skipper lost his wicket.
To be fair to the Delhi bowlers, they weren't in the mood for charity. There was no width on offer and they bowled a nagging line, especially in the power play.
Delhi Capitals made one change, bringing in fit-again pacer Ishant Sharma in place of Avesh Khan.
Warner said in the absence of Willamson, they picked two bowling all-rounders, Mitchell Marsh and Rashid Khan.
Neesham was asked on Twitter why he hasn't posted anything on Williamson's birthday.
The IPL is likely to be held from September-end till November, a window thrown open by the ICC's decision to postpone the October-November T20 World Cup in Australia.
The six New Zealand players who are set for the IPL are Jimmy Neesham (KXIP), Lockie Ferguson (KKR), Mitchell McClenaghan and Trent Boult (MI), Kane Williamson (SRH) and Mitchell Santner (CSK).