The closing date for entries is December 31.

参赛作品提交的截止日期是12月31日。

《柯林斯英汉双解大词典》

On the night of December 31, 2014, a holiday celebration turned into a terrible tragedy.

2014年12月31日晚，一场节日庆典变成了一场可怕的悲剧。

youdao

On December 31, a bomber in Baqouba detonated her suicide vest close to a police patrol, wounding five policemen and four civilians.

在12月31号，巴库巴的一名炸弹袭击者在一个警察巡逻队附近引爆了她的自杀式炸弹背心，造成5名警察和4名平民受伤。

youdao

Iran has rejected the December 31 deadline set by the international community to accept a deal to enrich its uranium overseas.

VOA: standard.2010.01.04

The controversy started on December 31, when the Malaysian High Court allowed Roman Catholics to use "Allah" to refer to God.

VOA: standard.2010.02.24

The threat,made on December 31 in a message posted on an extremist Internet Web site, prompted the Naval Criminal Investigative Service to elevate the risk for all U.S.military and commercial ships sailing through an area stretching from Somalia to the Persian Gulf.

VOA: standard.2010.01.07

So, what happens to the old munis issued before December 31, 2011 if this bill passes?

FORBES: A Trial Balloon That Could Deflate The Muni Market Even Further

Logitech late Wednesday posted weaker-than-expected results for its fiscal third quarter ended December 31.

FORBES: Logitech Q3 Misses; To Divest Remote Controls, Other Lines

The new requirements are effective for tax years ending on or after December 31, 2011.

FORBES: IRS Proposes New Regulations for Submitting EITC Claims