Since conference and of the Food and Agriculture Organization's publication World Festival of Trees, and a resolution of the United Nations in 1954: " The Conference, recognising the need of arousing mass consciousness of the aesthetic, physical and economic value of trees, recommends a World Festival of Trees to be celebrated annually in each member country on a date suited to local conditions "; it has been adopted by the Netherlands.

Since 1977, New Zealand has celebrated Arbor Day on June 5, which is also World Environment Day, prior to then Arbor Day, in New Zealand, was celebrated on August 4 – which is rather late in the year for tree planting in New Zealand hence the date change.

Since the focus of his book was calculation, Bede gave instructions for computing the date of Easter and the related time of the Easter Full Moon, for calculating the motion of the Sun and Moon through the zodiac, and for many other calculations related to the calendar.

Since April 2007, The Beano has had five revamps to help it keep up to date.

Since 1582, when the Catholic Church adopted the Gregorian calendar while the Eastern Orthodox and most Oriental Orthodox Churches retained the Julian calendar, the date on which Easter is celebrated has again differed.

Since the ecclesiastical new moon falls on a date from 8 March to 5 April inclusive, the paschal full moon ( the 14th of that lunar month ) must fall on a date from 21 March to 18 April inclusive.

Since there are two different calendars currently in use among various Orthodox churches, two dates are listed: the first date is the date on the traditional Julian Calendar, the second date, after the slash, is the same day on the modern Gregorian Calendar:

Since then the university has observed this date in its calendar as Convocation Day.

Since gravitational effects are all around us, it is impossible to pin down the exact date when humans first discovered gravitational mass.

Since that date, several fortified ships have made the journey.

Since a paper describing the algorithm had been published in August 1977, prior to the December 1977 filing date of the patent application, regulations in much of the rest of the world precluded patents elsewhere and only the US patent was granted.

Since this date, the Undertones have performed several tours across the UK, Ireland, Continental Europe and North America.

Since the first term of the original federal officials began on this date and ended 2, 4, or 6 years later, this became the date on which new federal officials took office in subsequent years.

Since these events recur at different intervals, this particular sequence should be unique: the doctors found only one occurrence of this sequence while searching between 1250 and 1115 BC, the 135-year spread around the putative date for the fall of Troy.

Since the date of Easter is calculated differently in the East and West ( see Easter controversy ), in most years the two traditions celebrate Pentecost on different days ( though in some years the celebrations will coincide, as in 2010 and 2011 ).

Since he was a younger son, little attention was paid to him during his youth and his date of birth is therefore unknown.

Since Vaceti is another name for the Vascones, this reference is evidence of Basque ( Gascon ) settlement or control of the islands by that date.

Since he didn't become consul, he most likely died before that date.

Since the date of his birth had never been recorded, he celebrated this day as his " Roman birthday " for the rest of his life.

Since that date there has been no further suggestion of banning the Australian flag from Big Day Out events.

Since the compilation of the Book of Joshua is regarded by textual scholars as late, probably being due to the deuteronomist, it is possible that the tribal allocations given within it date from after this annexation rather than before.

Since 1983 it has been part of the parliamentary constituency of Hastings and Rye ; the current MP, since 2010, is Amber Rudd of the Conservative Party.

Since 1987, the Member of Parliament for the Canterbury constituency, which includes Whitstable, has been the Conservative Julian Brazier.

Since the 2010 general election Penge has formed part of the Lewisham West and Penge constituency.

Since 1997 Strabane is part of the Westminster constituency of West Tyrone, held since 2001 by Sinn Féin's Pat Doherty.

Since the election of May 2005 this constituency has been represented by Richard Benyon, a Conservative.

Since 1997 Beverley has been part of the Beverley and Holderness constituency, a Conservative Party stronghold.

Since 1983, Ripon has been part of the Skipton and Ripon constituency, a Conservative Party stronghold.

Since then Ian Gilmour ( 1974 – 1992 ) and then Cheryl Gillan have represented the constituency on behalf of the Conservative party.

Since 1977 Austin Mitchell ( Labour ) has been the Member of Parliament for the Great Grimsby constituency.

( Since 2001 this constituency has been represented by the Leader of the Conservative Party and current Prime Minister David Cameron.

Since the Reform Act 1832 the town has been represented in Parliament as part of the Ashton-under-Lyne parliamentary constituency.

Since the recent boundary changes, neither of Sheffield's universities have a campus in the constituency, but it still includes areas where many students live.

Since 1950 Porthmadog has been part of Caernarfon parliamentary constituency, and has been represented by Hywel Williams of Plaid Cymru since 2001.

Since major boundary changes in Essex for the 2010 general election, Billericay has been part of the parliamentary constituency of Basildon and Billericay, whose MP is John Baron of the Conservative Party.

Since 2010 Bradford on Avon has been part of the Chippenham parliamentary constituency.

Since 1983 Rye has been part of the parliamentary constituency of Hastings and Rye, prior to which it had its own seat.

Since 1992 he has been Conservative Party Member of Parliament for the Ribble Valley constituency.

Since 2006, parliamentary rules have banned MPs from “ leasing accommodation from ... a partner .” Laws also maintained his main home in Chard in his Yeovil constituency, as well as a holiday home he owned in Provence, France.

Since the general election of 2010 the constituency has been represented by Liam Fox of the Conservative Party.

Since the 2010 General Election, the Member of Parliament representing the parliamentary constituency of Castle Point has been Rebecca Harris of the Conservative Party.

Since the 1918 general election, the town has been represented in Parliament by the member for the Stalybridge and Hyde county constituency.

Since May 2010, Greg McClymont, has been the Westminster MP for the Cumbernauld, Kilsyth and Kirkintilloch East ( UK Parliament constituency ).

Since 1997 it has been part of the Bishop Auckland constituency, whose MP since 2005 is Helen Goodman.

Since 1950 Criccieth has been part of Caernarfon parliamentary constituency, and has been represented by Hywel Williams of Plaid Cymru since 2001.