Ordering flowers across time zones, and whose clock counts

The order runs on the recipient's clock

When you order flowers for someone abroad, nothing is made where you are. A florist in the recipient's town takes the order, builds the arrangement from their own cold room and sends it out with their own driver, so every part of the job happens on local time. The shop opens when it is morning there, the wholesale buying was done in the small hours there, and the last van leaves as the afternoon ends there. Your clock plays no part in any of it.

Most cross-border mistakes come from assuming the two clocks line up. The florist sees your order arrive at whatever hour it is for them, and fits it into a working day that may be half over or not yet started.

So translate everything into the recipient's local time before deciding anything. Time zones are usually given as an offset from Coordinated Universal Time, written UTC, and once you know both offsets the arithmetic is quick. Not every offset is a whole number of hours: Indian Standard Time is UTC+05:30, which is why calls to family in India so often land on an odd half-hour.

Working out whether same-day is still realistic

Same-day delivery needs three things to line up in the recipient's town: the flowers in stock, a pair of hands free to make the arrangement, and a delivery round still to go out. A local shop can usually manage all three if the order reaches it in the morning. By mid-afternoon the rounds are planned and loaded, and by evening the work is done. Every florist sets their own limits, so treat this as a way of thinking rather than a rule.

• Convert the time now into the recipient's local time, not the time you vaguely plan to order.
• Still morning there: same-day is generally realistic, especially for a hand-tied bouquet rather than a large or unusual piece.
• Afternoon there: same-day becomes uncertain, and the later it gets, the likelier the flowers arrive the following day.
• Evening or night there: the florist's day is over, and nothing will be made until the shop opens again.
• Check that the local day is a working day for florists there, which is a different question from whether it is one for you.

The late-evening order for tomorrow morning

The most common disappointment comes from a perfectly reasonable habit. You remember a birthday at ten at night, order flowers for the next morning and go to bed content. If the recipient is several hours ahead of you, their morning is not a night's sleep away. It may be only a few hours off.

Take someone in the United Kingdom ordering late in the evening for a friend in India. While the United Kingdom is on Greenwich Mean Time the gap is five and a half hours, so an order placed just before midnight reaches the florist at about half past five in the morning, before most shops open. Under British Summer Time the gap narrows to four and a half hours. Either way, the florist first sees the order on arrival and must fit it around a first round that is already booked. An early-morning slot on that date is the request most likely to slip.

The fix is to order the evening before by the recipient's clock, not yours. For a morning delivery to someone ahead of you, that usually means ordering during your own afternoon.

When it is already tomorrow there

Large time differences create a stranger problem: the date itself differs. The International Date Line runs roughly along the 180° meridian through the Pacific Ocean, and places just west of it reach each new day long before places just east of it. Between the two extremes, the recipient's date and yours disagree for much of every day.

You do not need to be sending flowers across an ocean for this to bite. Whenever the recipient is far enough ahead, there is a stretch of your evening when it is already tomorrow for them. Choose today during that stretch and you have asked for a date that has ended where the flowers are going. Choose tomorrow and you may have picked a day that began hours ago, with the florist not yet open to make anything.

Birthdays and anniversaries happen on the recipient's date. When you pick a delivery date, pick it as the date will be where the flowers are going, and get the order to the florist before their morning starts.

The weeks when the gap moves

The difference between two places is not fixed through the year. India does not use daylight saving time, so its gap with the United Kingdom shifts by an hour twice a year purely because the United Kingdom changes its clocks.

The awkward weeks come when both countries change, but on different dates. In the United States clocks go forward on the second Sunday in March; in the United Kingdom and the European Union they go forward on the last Sunday in March. For two or three weeks each spring, and for about a week around the end of October, the usual gap between the two sides is an hour smaller than people expect. Southern hemisphere countries that observe daylight saving change in the opposite season. If your mental arithmetic for a relative's time zone was formed in a different season, check it before relying on it for a tight delivery.

Weekends and public holidays are local too

A day that is ordinary for you may be a day off where the flowers are going. In Saudi Arabia the official weekend falls on Friday and Saturday, so an order timed for the end of your working week can land on a local day of rest. Many florists open at weekends, often for shorter hours, but offices are usually shut.

Public holidays differ more, and several of the largest move each year. Diwali follows the lunar calendar and is a public holiday in India. The Lunar New Year, called the Spring Festival in China, moves too, with the length of the break set annually by the State Council. Around festivals like these, local florists can be at their busiest in the days before and closed or short-handed on the day itself. Where a festival's date depends on sighting the moon, it can shift by a day at short notice.

Occasions that share a purpose do not always share a date. Mothering Sunday in the United Kingdom falls on the fourth Sunday of Lent, while in the United States and many other countries the day honouring mothers is the second Sunday in May. If you live under one custom and your mother lives under the other, the day that counts is usually hers.