By Eric Vandenbroeck

Researchers including sociologists, historians and of course chronologists care about the Julian calendar because it was used worldwide for over 16 centuries. Some, for example, the Christian Eastern Orthodox Church, still use the Julian calendar to this day.

Also, equinoxes and solstices and any lunar and solar eclipses happening before October 15, 1582, are still dated by the Julian calendar.

Not everyone converted to the new calendar at the same time. England, for example, with its large empire and separate church kept its separate calendar, too, the Julian calendar, for another two centuries.

The year 46 B.C., a year before Julius Caesar implemented his namesake the Julian Calendar system, lasted 445 days and later became known as the "final year of confusion."

In other words, the systems used by mankind to track, organize and manipulate time have often been arbitrary, uneven and disruptive, especially when designed poorly or foisted upon an unwilling society. The history of calendrical reform has been shaped by the egos of emperors, disputes among churches, the insights of astronomers and mathematicians, and immutable geopolitical realities. Attempts at improvements have sparked political turmoil and commercial chaos, and seemingly rational changes have consistently failed to take root.

So what is the matter with the Gregorian calendar?

The original goal of the Gregorian calendar was to change the date of Easter. The Gregorian as a reform of the Julian calendar was instituted by papal bull Inter gravissimas dated 24 February 1582 by Pope Gregory XIII, after whom the calendar is named. The motivation for the adjustment was to bring the date for the celebration of Easter to the time of year in which it was celebrated when it was introduced by the early Church. The error in the Julian calendar (its assumption that there are exactly 365.25 days in a year) had led to the date of the equinox according to the calendar drifting from the observed reality, and thus an error had been introduced into the calculation of the date of Easter. Although a recommendation of the First Council of Nicaea in 325 specified that all Christians should celebrate Easter on the same day, it took almost five centuries before virtually all Christians achieved that objective by adopting the rules of the Church of Alexandria.

The Julian calendar included an extra day in February every four years. But Aloysius Lilius, the Italian scientist who developed the system Pope Gregory would unveil in 1582, realized that the addition of so many days made the calendar slightly too long. He devised a variation that adds leap days in years divisible by four unless the year is also divisible by 100. If the year is also divisible by 400, a leap day is added regardless. While this formula may sound confusing, it did resolve the lag created by Caesar’s earlier scheme, almost.

One can also say that at its core, the modern calendar was an attempt to track and predict the relationship between the sun and various regions of the earth. Historically, agricultural cycles, local climates, latitudes, tidal ebbs and flows and imperatives such as the need to anticipate seasonal change have shaped calendars. The Egyptian calendar, for example, was established in part to predict the annual rising of the Nile River, which was critical to Egyptian agriculture. This motivation is also why lunar calendars similar to the ones still used by Muslims fell out of favor somewhat, with 12 lunar cycles adding up to roughly 354 days, such systems quickly drift out of alignment with the seasons.

Though it deviates from the time it takes the earth to revolve around the sun by just 11 minutes (a remarkable astronomical feat for the time), the Julian system overly adjusted for the fractional difference in year length, slowly leading to a misalignment in the astronomical and calendar years.

This whereby many say the current system unnecessarily subjects businesses to numerous calendar-generated financial complications like the scheduling of the days for holidays, sporting events, and school schedules, to name but a few must be redone each year.

The system resets every leap year, slipping a little bit backward until a non-leap century year leap nudges the equinoxes forward in time once again. The next leap day will be added to the calendar on February 29, 2020.

Though Pope Gregory’s papal bull reforming the calendar had no power beyond the Catholic Church, Catholic countries, including Spain, Portugal, and Italy, swiftly adopted the new system for their civil affairs. European Protestants, however, largely rejected the change because of its ties to the papacy, fearing it was an attempt to silence their movement. It wasn’t until 1700 that Protestant Germany switched over, and England held out until 1752. Orthodox countries clung to the Julian calendar until even later, and their national churches have never embraced Gregory’s reforms.

A calendar as the onset of a globalized era

Thus what was perhaps most significant about Pope Gregory's system was not its changes, but rather its role in the onset of the globalized era. In centuries prior, countries around the world had used a disjointed array of uncoordinated calendars, each adopted for local purposes and based primarily on local geographical factors. The Mayan calendar would not be easily aligned with the Egyptian, Greek, Chinese or Julian calendars, and so forth. In addition to the pope's far-reaching influence, the adoption of the Gregorian system was facilitated by the emergence of a globalized system marked by exploration and the development of long-distance trade networks and interconnectors between regions beginning in the late 1400s. The pope's calendar was essentially the imposition of a truly global interactive system and the acknowledgment of a new global reality.

From the start, however, the Gregorian calendar faced resistance from several corners, and implementation was slow and uneven. The edict issued by Pope Gregory XIII carried no legal weight beyond the Papal States, so the adoption of his calendar for civil purposes necessitated implementation by individual governments.

Though Catholic countries like Spain and Portugal adopted the new system quickly, many Protestant and Eastern Orthodox countries saw the Gregorian calendar as an attempt to bring them under the Catholic sphere of influence. These states, including Germany and England, refused to adopt the new calendar for a number of years, though most eventually warmed to it for purposes of convenience in international trade. Russia only adopted it in 1918 after the Russian Revolution in 1917 (the Russian Orthodox Church still uses the Julian calendar), and Greece, the last European nation to adopt the Gregorian calendar for civil purposes, did not do so until 1923.

In 1793, following the French Revolution, the new republic replaced the Gregorian calendar with the French Republican calendar, commonly called the French Revolutionary calendar, as part of an attempt to purge the country of any remnants of regime (and by association, Catholic) influence. Due to a number of issues, including the calendar's inconsistent starting date each year, 10-day workweeks and incompatibility with secularly based trade events, the new calendar lasted only around 12 years before France reverted to the Gregorian version.

Iran changing its calendar twice in a three year period

The Shah of Iran attempted an experiment amid competition with the country's religious leaders for political influence. As part of a larger bid to shift power away from the clergy, the shah in 1976 replaced the country's Islamic calendar with the secular Imperial calendar, a move viewed by many as anti-Islamic, spurring opposition to the shah and his policies. After the shah was overthrown in 1979, his successor restored the Islamic calendar to placate protesters and to reach a compromise with Iran's religious leadership.

Several countries, Afghanistan, Saudi Arabia and Iran among them, still have not officially adopted the Gregorian calendar. India, Bangladesh, Israel, Myanmar, and a few other countries use various calendars alongside the Gregorian system, and still, others use a modified version of the Gregorian calendar, including Sri Lanka, Cambodia, Thailand, Japan, North Korea, and China. For agricultural reasons, it is still practical in many places to maintain a parallel local calendar based on agricultural seasons rather than relying solely on a universal system based on arbitrary demarcations or seasons and features elsewhere on the planet. In most such countries, however, the use of the Gregorian calendar among businesses and others engaged in the international system is widespread.

Attempts to change the Gregorian calendar

Dozens of attempts have been made over the years to improve the remaining inefficiencies in Pope Gregory's calendar, all boasting different benefits.

In 1928, Eastman Kodak founder George Eastman introduced a more business-friendly calendar (the International Fixed calendar) within his company that was the same from year to year and allowed numerical days of each month to fall on the same weekday, for example, the 15th of each month was always a Sunday. This setup had the advantage of facilitating business activities such as scheduling regular meetings and more accurately comparing monthly statistics.

Reform attempts have not been confined to hobbyists, advocates and academics. In 1954, the U.N. took up the question of calendar reform at the request of India, which argued that the Gregorian calendar creates an inadequate system for economic and business-related activities.

In 2012, Richard Conn Henry, a former NASA astrophysicist, teamed up with his colleague, an applied economist named Steve H. Hanke, to introduce perhaps the most workable attempt at calendrical reform to date. The Hanke–Henry Permanent Calendar (itself an adaptation of a calendar introduced in 1996 by Bob McClenon) is, as the pair wrote for the Cato Institute in 2012, "religiously unobjectionable, business-friendly and identical year-to-year."

The Hanke–Henry Permanent Calendar would provide a fixed 364-day year with business quarters of equal length, eliminating many of the financial problems posed by its Gregorian counterpart. Calculations of interest, for example, often rely on estimates that use a 30-day month (or a 360-day year) for the sake of convenience, rather than the actual number of days, resulting in inaccuracies that, if fixed by the Hanke-Henry calendar, its creators say, would save up to an estimated $130 billion per year worldwide. (Similar problems would still arise for the years given an extra week in the Hanke-Henry system.)

Meanwhile, it would preserve the seven-day week cycle and in turn, the religious tradition of observing the Sabbath, the obstacle blocking many previous proposals' path to success. As many as eight federal holidays would also consistently fall on weekends; while this probably would not be popular with employees, the calendar's authors argue that it could save the United States as much as $150 billion per year (though it is difficult to anticipate how companies and workers would respond to the elimination of so many holidays, casting doubt upon such figures).

Other proposals have been the Holocene calendar, the International Fixed Calendar (also called the International Perpetual calendar), the World Calendar, the World Season Calendar, the Leap week calendars, the Pax Calendar, the Symmetry454 calender.

Most reform proposals have failed to supplant the Gregorian system not because they failed to improve upon the status quo altogether, but because they either do not preserve the Sabbath, they disrupt the seven-day week (only a five-day week would fit neatly into a 365-day calendar without necessitating leap weeks or years) or they stray from the seasonal cycle. And the possibilities of calendrical reform highlight the difficulty of worldwide cooperation in the modern international system. Global collaboration would indeed be critical since reform in certain places but not in others would cause more chaos and inefficiency than already exist in the current system. A tightly coordinated, carefully managed transition period would be critical to avoid many of the issues that occurred when the Gregorian calendar was adopted.

The current year according to various historical and world calendars, as of January 01, 2020:

Today, in a more deeply interconnected, state-dominated system that lacks the singularly powerful voices of emperors or ecclesiastical authorities, who or what could compel such cooperation? Financial statistics and abstract notions of global efficiency are not nearly as unifying or animating as religious edicts, moral outrage or perceived threats. Theoretically, the benefits of a more rational calendar could lead to the emergence of a robust coalition of multinational interests advocating for a more efficient alternative, and successes such as the steady and continuous adoption of the metric system across the world highlight how efficiency-improving ideas can gain widespread adoption.

But international cooperation and coordination have remained elusive in far more pressing and less potentially disruptive issues. Absent more urgent and mutually beneficial incentives to change the system and a solution that appeals to a vast majority of people, global leaders will likely not be compelled to undertake the challenge of navigating what would inevitably be a disruptive and risky transition to an ostensibly more efficient alternative.

Any number of factors could generate resistance to change. If the benefits of a new calendar were unevenly distributed across countries, or if key powers would in any way be harmed by the change, any hope for a comprehensive global agreement would quickly collapse. Societies have long adjusted to the inefficiencies of the Gregorian system, and it would be reasonable to expect some level of resistance to attempts to disrupt a convention woven so deeply into the fabric of everyday life, especially if, say, the change disrupted cherished traditions or eliminated certain birthdays or holidays. Particularly in societies already suspicious of Western influence and power, attempts to implement something like the Hanke–Henry Permanent Calendar may once again spark considerable political opposition.

Even if a consensus among world leaders emerged in favor of reform, the details of the new system likely would still be vulnerable to the various interests, constraints and political whims of individual states. In the United States, for example, candy makers hoping to extend daylight trick-or-treating hours on Halloween lobbied extensively for the move of daylight saving time to November. According to legend, in the Julian calendar, February was given just 28 days in order to lengthen August and satisfy Augustus Caesar's vanity by making his namesake month as long as Julius Caesar's July. The real story likely has more to do with issues related to numerology, ancient traditions or the haphazard evolution of an earlier Roman lunar calendar that only covered from around March to December. Regardless of what exactly led to February's curious composition, its diminutive design reinforces the complicated nature of calendar adoption.

Such interference would not necessarily happen today, but it matters that it could. The policy is not made in a vacuum, and even the carefully calibrated Hanke-Henry calendar would not be immune to politics, narrow interests or caprice. Given the opportunity to bend such reform to a state's or leader's needs, even if only to prolong a term in office, manipulate a statistic or prevent one's birthday from always falling on a Tuesday, certain leaders could very well take it.

Calendrical change is possible, it just tends to happen in fits and starts, lurching unevenly through history as each era refines, tinkers and adds its own contributions to make a better system. And if a global heavyweight with worldwide influence and leadership capabilities adopts the change, others may follow, even if not immediately.

Nonetheless, a fundamental, worldwide change to something as long-established as the calendar is not unthinkable, primarily because it has happened several times before. In other words, calendrical change is possible, it just tends to happen in fits and starts, lurching unevenly through history as each era refines, tinkers and adds its own contributions to make a better system. And if a global heavyweight with worldwide influence and leadership capabilities adopts the change, others may follow, even if not immediately.

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